364-DAY CREDIT AGREEMENT

Exhibit 10.1

Execution copy

364-DAY CREDIT AGREEMENT

Dated as of July 2, 2010

among

PATTERSON — UTI ENERGY, INC.,

as the Borrower,

WELLS FARGO BANK, N.A.,
as Administrative Agent and a Lender,

and

The Other Lenders Party Hereto

TABLE OF CONTENTS

		Page
ARTICLE I DEFINITIONS AND ACCOUNTING TERMS			1
1.01 Defined Terms			1
1.02 Other Interpretive Provisions			20
1.03 Accounting Terms			21
1.04 Rounding			21
1.05 Times of Day			21
1.06 Responsible Officer			21
ARTICLE II THE COMMITMENTS AND CREDIT EXTENSIONS			22
2.01 Loans			22
2.02 Borrowings, Conversions and Continuations of Loans			22
2.03 [Reserved]			23
2.04 Voluntary Prepayments			23
2.05 Mandatory Prepayments			23
2.06 [Reserved]			24
2.07 Repayment of Loans			24
2.08 Interest			24
2.09 Fees			25
2.10 Computation of Interest and Fees			25
2.11 Evidence of Debt			25
2.12 Payments Generally; Administrative Agent’s Clawback			26
2.13 Sharing of Payments by Lenders			27
ARTICLE III TAXES, YIELD PROTECTION AND ILLEGALITY			28
3.01 Taxes			28
3.02 Illegality			30
3.03 Inability to Determine Rates			31
3.04 Increased Costs; Reserves on Eurodollar Rate Loans			31
3.05 Compensation for Losses			32
3.06 Mitigation Obligations			33
3.07 Survival			33
ARTICLE IV CONDITIONS PRECEDENT TO CREDIT EXTENSIONS			33

TABLE OF CONTENTS
(continued)

		Page
4.01 Conditions of Initial Credit Extension			33
ARTICLE V REPRESENTATIONS AND WARRANTIES			35
5.01 Existence, Qualification and Power; Compliance with Laws			35
5.02 Authorization; No Contravention			36
5.03 Governmental Authorization; Other Consents			36
5.04 Binding Effect			36
5.05 Financial Statements			36
5.06 Litigation			36
5.07 No Default			37
5.08 Ownership of Property; Liens			37
5.09 Environmental Compliance			37
5.10 Insurance			37
5.11 Taxes			37
5.12 ERISA Compliance			37
5.13 Subsidiaries; Equity Interests			38
5.14 Margin Regulations; Investment Company Act			38
5.15 Disclosure			38
5.16 Compliance with Laws			39
ARTICLE VI AFFIRMATIVE COVENANTS			39
6.01 Financial Statements			39
6.02 Certificates; Other Information			40
6.03 Notices			41
6.04 Payment of Obligations			42
6.05 Preservation of Existence, Etc			42
6.06 Maintenance of Properties			42
6.07 Maintenance of Insurance			42
6.08 Compliance with Laws			42
6.09 Books and Records			43
6.10 Inspection Rights			43
6.11 Use of Proceeds			43

TABLE OF CONTENTS
(continued)

		Page
6.12 Additional Guarantors			43
ARTICLE VII NEGATIVE COVENANTS			43
7.01 Liens			43
7.02 Foreign Subsidiaries and Joint Ventures			45
7.03 Indebtedness of Subsidiaries			45
7.04 Fundamental Changes			46
7.05 Hedging Agreements			47
7.06 Change in Nature of Business			47
7.07 Transactions with Affiliates			47
7.08 Burdensome Agreements			48
7.09 Use of Proceeds			48
7.10 Financial Covenants			48
ARTICLE VIII EVENTS OF DEFAULT AND REMEDIES			48
8.01 Events of Default			48
8.02 Remedies Upon Event of Default			50
8.03 Application of Funds			51
ARTICLE IX ADMINISTRATIVE AGENT			51
9.01 Appointment and Authority			51
9.02 Rights as a Lender			51
9.03 Exculpatory Provisions			52
9.04 Reliance by Administrative Agent			53
9.05 Delegation of Duties			53
9.06 Resignation of Administrative Agent			53
9.07 Non-Reliance on Administrative Agent and Other Lenders			54
9.08 No Other Duties, Etc.			54
9.09 Administrative Agent May File Proofs of Claim			54
9.10 Guaranty Matters			55
ARTICLE X MISCELLANEOUS			55
10.01 Amendments, Etc.			55
10.02 Notices; Effectiveness; Electronic Communication			56

TABLE OF CONTENTS
(continued)

		Page
10.03 No Waiver; Cumulative Remedies			57
10.04 Expenses; Indemnity; Damage Waiver			57
10.05 Payments Set Aside			59
10.06 Successors and Assigns			59
10.07 Treatment of Certain Information; Confidentiality			63
10.08 Right of Setoff			64
10.09 Interest Rate Limitation			64
10.10 Counterparts; Integration; Effectiveness			64
10.11 Survival of Representations and Warranties			65
10.12 Severability			65
10.13 Replacement of Lenders			65
10.14 Governing Law; Jurisdiction; Etc.			66
10.15 Waiver of Jury Trial			67
10.16 USA PATRIOT Act Notice			67
10.17 ENTIRE AGREEMENT			67
SIGNATURES			S-1

TABLE OF CONTENTS
(continued)

SCHEDULES

			2.01			Commitments and Applicable Percentages
			5.13			Subsidiaries; Other Equity Investments
			7.01			Existing Liens
			10.02			Administrative Agent’s Office; Certain Addresses for Notices

EXHIBITS

				Form of
		A		Loan Notice
		B		Note
		C		Compliance Certificate
		D		Assignment and Assumption
		E		Guaranty
		F		Opinion of Counsel
		G		Prepayment Notice

364-DAY CREDIT AGREEMENT

     This 364-DAY CREDIT AGREEMENT is entered into as of July 2, 2010 among PATTERSON — UTI ENERGY, INC., a Delaware corporation (the “Borrower”), each lender from time to time party hereto (collectively, the “Lenders” and individually, a “Lender”), and WELLS FARGO BANK, N.A., as Administrative Agent and a Lender.

     The Borrower has requested that the Lenders provide a term loan facility, and the Lenders are willing to do so on the terms and conditions set forth herein.

     In consideration of the mutual covenants and agreements herein contained, the parties hereto covenant and agree as follows:

ARTICLE I

DEFINITIONS AND ACCOUNTING TERMS

     1.01 Defined Terms. As used in this Agreement, the following terms shall have the meanings set forth below:

     “Acquisition” means the acquisition by the Borrower or one of its wholly-owned Subsidiaries of certain pressure pumping and electric wireline businesses of the Sellers pursuant to the Asset Purchase Agreement.

     “Acquisition Documents” means the “Transaction Documents” as defined in the Asset Purchase Agreement.

     “Administrative Agent” means Wells Fargo in its capacity as administrative agent under any of the Loan Documents, or any successor administrative agent.

     “Administrative Agent’s Office” means the Administrative Agent’s address and, as appropriate, account as set forth on Schedule 10.02, or such other address or account as the Administrative Agent may from time to time provide to the Borrower and the Lenders.

     “Administrative Questionnaire” means an Administrative Questionnaire in a form supplied by the Administrative Agent.

     “Affiliate” means, with respect to any Person, another Person that directly, or indirectly through one or more intermediaries, Controls or is Controlled by or is under common Control with the Person specified.

     “Aggregate Commitments” means the Commitments of all the Lenders.

     “Agreement” means this 364-Day Credit Agreement, as the same may hereafter be renewed, extended, amended or restated from time to time.

     “Applicable Percentage” means with respect to any Lender at any time, the percentage (carried out to the ninth decimal place) of the Aggregate Commitments represented by such Lender’s Commitment at such time. If the commitment of each Lender to make Loans has been terminated pursuant to Section 8.02 or if the Aggregate Commitments have expired, then the Applicable Percentage of each Lender shall be determined based on the Applicable Percentage of such Lender most recently in effect, giving effect to any subsequent assignments. The initial Applicable Percentage of each Lender is set forth opposite the name of such Lender on Schedule 2.01 or in the Assignment and Assumption pursuant to which such Lender becomes a party hereto, as applicable.

     “Applicable Rate” means, from time to time, the following percentages per annum, based upon the Debt to Capitalization Ratio as set forth below:

Applicable Rate

				Eurodollar
		Debt to		Rate;
Pricing		Capitalization		Letters of
Level		Ratio		Credit		Base Rate
1		Less than or equal to 20%		3.00%		2.00%
2		Greater than 20%, but less than or equal to 30%		3.50%		2.50%
3		Greater than 30%		4.00%		3.00%

     Any increase or decrease in the Applicable Rate resulting from a change in the Debt to Capitalization Ratio shall become effective as of the date (the “Adjustment Date”) that is the first day of the fiscal quarter (the “Applicable Quarter”) immediately following the date that a Compliance Certificate is due to be delivered pursuant to Section 6.02(b) hereof; provided, however, that if a Compliance Certificate is not delivered within thirty (30) days after the date due, then Pricing Level 3 shall apply as of the Adjustment Date.

     The Applicable Rate in effect from the Closing Date through the date the Compliance Certificate is delivered in connection with the fiscal quarter ended September 30, 2010, shall be the Pricing Level 1.

     “Asset Disposition” means any disposition, (i) whether by sale, lease, license, transfer or otherwise, to a Person that is not a Subsidiary of any or all of the property of the Borrower or any of its Subsidiaries, other than (a) dispositions in the ordinary course of business, (b) any casualty or other insured damage to, or any taking under power of eminent domain or condemnation or similar proceeding of, any property or asset of the Borrower or any of its Subsidiaries, (c) leases or subleases of property and licenses or sublicenses of intellectual property, (d) dispositions or write-downs of accounts receivable in connection with the compromise, settlement or collection thereof in the ordinary course of business or bankruptcy or similar proceedings, (e) disposition of investments’ acquired in connection with the bankruptcy or reorganization of, or settlement of

delinquent accounts and disputes with customers and suppliers or as a result of a foreclosure by Borrower or any of its Subsidiaries with respect to any secured investment or other transfer of title with respect to any secured investment in default, (f) customary post closing settlement arrangements as part of a merger or acquisition, (g) Liens permitted by Section 7.01, (h) voluntary termination of Swap Contracts; and (ii) the Net Proceeds of which exceed $5,000,000 in a single transaction or $10,000,000 in the aggregate during any fiscal year.

     “Asset Purchase Agreement” means the Asset Purchase Agreement dated as of July 2, 2010 among one or more of the Borrower’s wholly-owned Subsidiaries, the Borrower, the Sellers, and Key Energy Services, Inc., a Maryland corporation, together with all exhibits and schedules thereto.

     “Assignment and Assumption” means an assignment and assumption entered into by a Lender and an Eligible Assignee (with the consent of any party whose consent is required by Section 10.06(b)), and accepted by the Administrative Agent, in substantially the form of Exhibit D or any other form approved by the Administrative Agent.

     “Attributable Indebtedness” means, on any date, (a) in respect of any capital lease of any Person, the capitalized amount thereof that would appear on a balance sheet of such Person prepared as of such date in accordance with GAAP, and (b) in respect of any Synthetic Lease Obligation, the capitalized amount of the remaining lease payments under the relevant lease that would appear on a balance sheet of such Person prepared as of such date in accordance with GAAP if such lease were accounted for as a capital lease.

     “Audited Financial Statements” means the audited consolidated balance sheet of the Borrower and its Subsidiaries for the fiscal year ended December 31, 2009, and the related consolidated statements of income or operations, shareholders’ equity and cash flows for such fiscal year of the Borrower and its Subsidiaries, including the notes thereto.

     “Base Rate” means for any day a fluctuating rate per annum equal to the greatest of (a) the Federal Funds Rate plus one and one-half percent (1.50%), (b) the Daily One Month LIBOR Rate plus one and one-half percent (1.50%), and (c) the rate of interest in effect for such day as publicly announced from time to time by Wells Fargo as its “prime rate.” The “prime rate” is a rate set by Wells Fargo based upon various factors including Wells Fargo’s costs and desired return, general economic conditions and other factors, and is used as a reference point for pricing some loans, which may be priced at, above, or below such announced rate. Any change in such rate announced by Wells Fargo shall take effect at the opening of business on the day specified in the public announcement of such change.

     “Base Rate Loan” means a Loan that bears interest based on the Base Rate.

     “Borrower” has the meaning specified in the introductory paragraph hereto.

     “Borrowing” means a borrowing consisting of simultaneous Loans of the same Type and, in the case of Eurodollar Rate Loans, having the same Interest Period, made by each of the Lenders pursuant to Section 2.01.

     “Business Day” means any day other than a Saturday, Sunday or other day on which commercial banks are authorized to close under the Laws of, or are in fact closed in, the state where the Administrative Agent’s Office is located and, if such day relates to any Eurodollar Rate Loan, means, in addition, any such day on which dealings in Dollar deposits are conducted by and between banks in the London interbank eurodollar market.

     “Change in Law” means the occurrence, after the date of this Agreement, of any of the following: (a) the adoption or taking effect of any law, rule, regulation or treaty, (b) any change in any law, rule, regulation or treaty or in the administration, interpretation or application thereof by any Governmental Authority or (c) the making or issuance of any request, guideline or directive (whether or not having the force of law) by any Governmental Authority.

     “Change of Control” means an event or series of events by which:

     (a) any “person” or “group” (as such terms are used in Sections 13(d) and 14(d) of the Securities Exchange Act of 1934, but excluding any employee benefit plan of such person or its subsidiaries, and any person or entity acting in its capacity as trustee, agent or other fiduciary or administrator of any such plan) becomes the “beneficial owner” (as defined in Rules 13d-3 and 13d-5 under the Securities Exchange Act of 1934, except that a person or group shall be deemed to have “beneficial ownership” of all securities that such person or group has the right to acquire (such right, an “option right”), whether such right is exercisable immediately or only after the passage of time), directly or indirectly, of 25% or more of the equity securities of the Borrower entitled to vote for members of the board of directors or equivalent governing body of the Borrower on a fully-diluted basis (and taking into account all such securities that such person or group has the right to acquire pursuant to any option right);

     (b) during any period of 12 consecutive months, a majority of the members of the board of directors or other equivalent governing body of the Borrower cease to be composed of individuals (i) who were members of that board or equivalent governing body on the first day of such period, (ii) whose election or nomination to that board or equivalent governing body was approved by individuals referred to in clause (i) above constituting at the time of such election or nomination at least a majority of that board or equivalent governing body or (iii) whose election or nomination to that board or other equivalent governing body was approved by individuals referred to in clauses (i) and (ii) above constituting at the time of such election or nomination at least a majority of that board or equivalent governing body (excluding, in the case of both clause (ii) and clause (iii), any individual whose initial nomination for, or assumption of office as, a member of that board or equivalent governing body occurs as a result of an actual or threatened solicitation of proxies or consents for the election or removal of one or more directors by any person or group other than a solicitation for the election of one or more directors by or on behalf of the board of directors); or

     (c) any Person or two or more Persons acting in concert shall have acquired by contract or otherwise, or shall have entered into a contract or arrangement that, upon consummation thereof, will result in its or their acquisition of the power to exercise, directly or indirectly, a controlling influence over the management or policies of the Borrower, or control over the equity securities of the Borrower entitled to vote for members of the board of directors or equivalent governing body of the Borrower on a fully-diluted basis (and taking into account

all such securities that such Person or group has the right to acquire pursuant to any option right) representing 25% or more of the combined voting power of such securities.

     “Closing Date” means the first date all the conditions precedent in Section 4.01 are satisfied or waived in accordance with Section 10.01, which date shall not be later than September 30, 2010 (or October 30 upon Wells Fargo’s receipt of the Commitment Extension Fee (as defined in the Fee Letter)).

     “Code” means the Internal Revenue Code of 1986, as amended.

     “Commitment” means, as to each Lender, its obligation to make Loans to the Borrower pursuant to Section 2.01 in an aggregate principal amount at any one time outstanding not to exceed the amount set forth opposite such Lender’s name on Schedule 2.01 or in the Assignment and Assumption pursuant to which such Lender becomes a party hereto, as applicable, as such amount may be adjusted from time to time in accordance with this Agreement.

     “Compliance Certificate” means a certificate substantially in the form of Exhibit C.

     “Consolidated EBITDA” means, for any period, for the Borrower and its Subsidiaries on a consolidated basis, an amount equal to Consolidated Net Income for such period plus (a) the following to the extent deducted in calculating such Consolidated Net Income: (i) Consolidated Interest Charges for such period, (ii) the provision for Federal, state, local and foreign income taxes (including state franchise taxes based on income or similar taxes based on income) payable by the Borrower and its Subsidiaries for such period, (iii) depreciation, depletion and amortization expense and (iv) other expenses of the Borrower and its Subsidiaries reducing such Consolidated Net Income which do not represent a cash item in such period or any future period and minus, to the extent included in calculating such Consolidated Net Income, all non-cash items increasing Consolidated Net Income for such period. For the purposes of calculating Consolidated EBITDA for any period of four consecutive fiscal quarters, if the Borrower or any Subsidiary has had a material acquisition during such period, Consolidated EBITDA for such period shall be calculated after giving pro forma effect thereto as if such material acquisition had occurred on the first day of such period.

     “Consolidated Funded Indebtedness” means, as of any date of determination, Indebtedness of the Borrower and its Subsidiaries on a consolidated basis, excluding (a) Indebtedness of the type described in clauses (b) (so long as such amounts in such clause are contingent obligations), (c) and (g) of the definition of Indebtedness; and (b) Guarantees in respect of Indebtedness described in the foregoing clause (a).

     “Consolidated Interest Charges” means, for any period, for the Borrower and its Subsidiaries on a consolidated basis, the sum of (a) all interest, premium payments, debt discount, fees, charges and related expenses of the Borrower and its Subsidiaries in connection with borrowed money (including capitalized interest) or in connection with the deferred purchase price of assets, in each case to the extent treated as interest in accordance with GAAP, and (b) the portion of rent expense of the Borrower and its Subsidiaries with respect to such period under capital leases that is treated as interest in accordance with GAAP.

     “Consolidated Net Income” means, for any period, for the Borrower and its Subsidiaries on a consolidated basis, the net income of the Borrower and its Subsidiaries (excluding extraordinary gains and extraordinary losses) for that period.

     “Consolidated Net Worth” means, as of any date of determination, for the Borrower and its Subsidiaries on a consolidated basis, Shareholders’ Equity of the Borrower and its Subsidiaries on that date.

     “Contractual Obligation” means, as to any Person, any provision of any security issued by such Person or of any agreement, instrument or other undertaking to which such Person is a party or by which it or any of its property is bound.

     “Control” means the possession, directly or indirectly, of the power to direct or cause the direction of the management or policies of a Person, whether through the ability to exercise voting power, by contract or otherwise. “Controlling” and “Controlled” have meanings correlative thereto.

     “Credit Extension” means a Borrowing.

     “Daily One Month LIBOR” means, for any day, the rate per annum equal to the Eurodollar Rate for a one month Interest Period.

     “Debt to Capitalization Ratio” means the ratio of Consolidated Funded Indebtedness to Total Capital.

     “Debtor Relief Laws” means the Bankruptcy Code of the United States, and all other liquidation, conservatorship, bankruptcy, assignment for the benefit of creditors, moratorium, rearrangement, receivership, insolvency, reorganization, or similar debtor relief Laws of the United States or other applicable jurisdictions from time to time in effect and affecting the rights of creditors generally.

     “Default” means any event or condition that constitutes an Event of Default or that, with the giving of any notice, the passage of time, or both, would be an Event of Default.

     “Default Rate” means an interest rate equal to (a) the Base Rate plus (b) the Applicable Rate, if any, applicable to Base Rate Loans plus (c) 2% per annum; provided, however, that with respect to a Eurodollar Rate Loan, the Default Rate shall be an interest rate equal to the interest rate (including any Applicable Rate) otherwise applicable to such Loan plus 2% per annum.

     “Defaulting Lender” means any Lender that (a) has failed to fund any portion of the Loans or any other amount required to be funded by it hereunder within one Business Day of the date required to be funded by it hereunder, (b) has indicated to the Administrative Agent that such Lender will not fund any portion of the Loans required to be funded by it hereunder, (c) has otherwise failed to pay over to the Administrative Agent or any other Lender any other amount required to be paid by it hereunder within one Business Day of the date when due, unless the subject of a good faith dispute, or (d) (i) has become, been deemed, or is insolvent or (ii) become the subject of a bankruptcy or insolvency proceeding, or has had a receiver, conservator, trustee,

or custodian appointed for it, or has taken any action in furtherance of, or indicating its consent to, approval of or acquiescence in any such proceeding or appointment.

     “Disposition” or “Dispose” means the sale, transfer, license, lease or other disposition (including any sale and leaseback transaction) of any property by any Person, including any sale, assignment, transfer or other disposal, with or without recourse, of any notes or accounts receivable or any rights and claims associated therewith.

     “Dollar” and “$” mean lawful money of the United States.

     “Domestic Subsidiary” means any Subsidiary that is organized under the laws of any political subdivision of the United States.

     “Eligible Assignee” means any Person (other than a natural person) approved by (a) the Administrative Agent and (b) unless an Event of Default has occurred and is continuing, the Borrower (each such approval not to be unreasonably withheld or delayed); provided that notwithstanding the foregoing, “Eligible Assignee” shall not include the Borrower or any of the Borrower’s Affiliates or Subsidiaries.

     “Environmental Laws” means any and all Federal, state, local, and foreign statutes, laws, regulations, ordinances, rules, judgments, orders, decrees, permits, concessions, grants, franchises, licenses, agreements or governmental restrictions relating to pollution and the protection of the environment or the release of any materials into the environment, including those related to hazardous substances or wastes, air emissions and discharges to waste or public systems.

     “Environmental Liability” means any liability, contingent or otherwise (including any liability for damages, costs of environmental remediation, fines, penalties or indemnities), of the Borrower, any other Loan Party or any of their respective Subsidiaries directly or indirectly resulting from or based upon (a) violation of any Environmental Law, (b) the generation, use, handling, transportation, storage, treatment or disposal of any Hazardous Materials, (c) exposure to any Hazardous Materials, (d) the release or threatened release of any Hazardous Materials into the environment or (e) any contract, agreement or other consensual arrangement pursuant to which liability is assumed or imposed with respect to any of the foregoing.

     “Equity Interests” means, with respect to any Person, all of the shares of capital stock of (or other ownership or profit interests in) such Person, all of the warrants, options or other rights for the purchase or acquisition from such Person of shares of capital stock of (or other ownership or profit interests in) such Person, all of the securities convertible into or exchangeable for shares of capital stock of (or other ownership or profit interests in) such Person or warrants, rights or options for the purchase or acquisition from such Person of such shares (or such other interests), and all of the other ownership or profit interests in such Person (including partnership, member or trust interests therein), whether voting or nonvoting, and whether or not such shares, warrants, options, rights or other interests are outstanding on any date of determination.

     “Equity Issuance” means any issuance of Equity Interests by the Borrower after the Closing Date, other than Equity Interests issued pursuant to stock option plans or other benefit plans, incentive or compensation arrangements or agreements for directors, officers or

employees of the Borrower and its Subsidiaries, or issued or sold as compensation and held by future, present or former directors, officers, members of management, employees or consultants of the Borrower or any of its Subsidiaries or family members or relatives thereof, or trusts, partnerships or limited liability companies for the benefit or any of the foregoing, or any of their heirs, executors successors and legal representatives

     “Equity Issuance Proceeds” means, with respect to any Equity Issuance, all cash proceeds actually received by the Borrower from such Equity Issuance, net of underwriting discounts and commissions and net of out-of-pocket costs, expenses and disbursements paid or incurred in connection therewith; for the avoidance of doubt, the Borrower shall be deemed not to have received cash proceeds for purposes of this definition with respect to the cashless exercise of a warrant, option or other right or the withholding of cash for tax purposes related to the exercise of a warrant, option or other right.

     “ERISA” means the Employee Retirement Income Security Act of 1974.

     “ERISA Affiliate” means any trade or business (whether or not incorporated) under common control with the Borrower within the meaning of Section 414(b) or (c), (m) or (o) of the Code.

     “ERISA Event” means (a) a Reportable Event with respect to a Pension Plan; (b) a withdrawal by the Borrower or any ERISA Affiliate from a Pension Plan subject to Section 4063 of ERISA during a plan year in which it was a substantial employer (as defined in Section 4001(a)(2) of ERISA) or a cessation of operations that is treated as such a withdrawal under Section 4062(e) of ERISA; (c) a complete withdrawal (within the meaning of Section 4203 of ERISA) or partial withdrawal (within the meaning of Section 4205 of ERISA) by the Borrower or any ERISA Affiliate from a Multiemployer Plan or receipt by the Borrower or an ERISA Affiliate of notice that a Multiemployer Plan is in reorganization within the meaning of Section 4241 of ERISA; (d) the filing of a notice of intent to terminate, the treatment of a Plan amendment as a termination under Section 4041(c) of ERISA, receipt by the Borrower or an ERISA Affiliate of notice or the termination or a Multiemployer Plan under Section 4041A of ERISA, or receipt by the Borrower or an ERISA Affiliate of notice of the commencement of proceedings by the PBGC to terminate a Pension Plan or Multiemployer Plan; (e) receipt by the Borrower or an ERISA Affiliate of notice of a determination by the PBGC that an event has occurred or a condition exists which constitutes grounds under Section 4042 of ERISA for the termination of, or the appointment of a trustee to administer, any Pension Plan or Multiemployer Plan; or (f) the imposition of any liability under Title IV of ERISA, other than for PBGC premiums due but not delinquent under Section 4007 of ERISA, upon the Borrower or any ERISA Affiliate.

     “Eurodollar Rate” means, for any Interest Period with respect to a Eurodollar Rate Loan, the rate per annum (rounded upward, if necessary, to the nearest whole 1/8 of 1%) equal to the British Bankers Association LIBOR Rate (“BBA LIBOR”), as published by Reuters (or other commercially available, internationally recognized source providing quotations of BBA LIBOR as designated by the Administrative Agent from time to time) at approximately 11:00 a.m., London time, two (2) Business Days prior to the commencement of such Interest Period, for Dollar deposits (for delivery on the first day of such Interest Period) with a term equivalent to

such Interest Period. If such rate is not available at such time for any reason or will not adequately and fairly reflect the cost to the Required Lenders of funding such Loan, then either (A) the “Eurodollar Rate” for such Interest Period shall be the rate per annum determined by the Administrative Agent to be the rate at which deposits in Dollars for delivery on the first day of such Interest Period in same day funds in the approximate amount of the Eurodollar Rate Loan being made, continued or converted by Administrative Agent and with a term equivalent to such Interest Period would be offered by Administrative Agent’s London Branch to major banks in the London interbank eurodollar market at their request at approximately 11:00 a.m. (London time) two Business Days prior to the commencement of such Interest Period or (B) for purposes of determining the Daily One Month LIBOR Rate only, the Daily One Month LIBOR Rate shall be equal to the arithmetic average (rounded in accordance with normal market practice) of BBA LIBOR for each day during the week prior to BBA LIBOR becoming unavailable.

     “Eurodollar Rate Loan” means a Loan that bears interest at a rate based on the Eurodollar Rate.

     “Event of Default” has the meaning specified in Section 8.01.

     “Excluded Taxes” means, with respect to the Administrative Agent, any Lender or any other recipient of any payment to be made by or on account of any obligation of the Borrower hereunder, (a) taxes imposed on or measured by its overall net income (however denominated), and franchise taxes imposed on it (in lieu of net income taxes), by the United States, any state thereof, or by the jurisdiction (or any political subdivision thereof) under the laws of which such recipient is organized or in which its principal office is located or, in the case of any Lender, in which its applicable Lending Office is located, (b) any branch profits taxes imposed by the United States or any similar tax imposed by any other jurisdiction in which the Administrative Agent, any Lender, any other recipient of any payment to be made by or on account of any obligation of the Borrower hereunder or the Borrower is located, (c) in the case of a Foreign Lender, any withholding tax that is imposed on amounts payable to such Foreign Lender at the time such Foreign Lender becomes a party hereto (or designates a new Lending Office) or is attributable to such Foreign Lender’s failure or inability (other than as a result of a Change in Law) to comply with Section 3.01(e), except to the extent that such Foreign Lender (or its assignor, if any) was entitled, at the time of designation of a new Lending Office (or assignment), to receive additional amounts from the Borrower with respect to such withholding tax pursuant to Section 3.01(a), and (d) in the case of any Foreign Lender that is subject to withholding tax on amounts payable to such Foreign Lender at the time such Foreign Lender becomes a party hereto (or designates a new Lending Office), any additional withholding tax that is imposed on amounts payable to such Foreign Lender as a result of a Change in Law.

     “Existing Credit Agreement” means the Credit Agreement dated as of March 20, 2009 among the Borrower, the lenders party thereto and Wells Fargo, as administrative agent, as amended, supplemented or otherwise modified on or before the date hereof.

     “Federal Funds Rate” means, for any day, the rate per annum equal to the weighted average of the rates on overnight Federal funds transactions with members of the Federal Reserve System arranged by Federal funds brokers on such day, as published by the Federal Reserve Bank of New York on the Business Day next succeeding such day; provided that (a) if

such day is not a Business Day, the Federal Funds Rate for such day shall be such rate on such transactions on the next preceding Business Day as so published on the next succeeding Business Day, and (b) if no such rate is so published on such next succeeding Business Day, the Federal Funds Rate for such day shall be the rate most recently published.

     “Fee Letter” means the letter agreement, dated June 17, 2010, between the Borrower and Wells Fargo.

     “Foreign Lender” means any Lender that is organized under the laws of a jurisdiction other than that in which the Borrower is resident for tax purposes. For purposes of this definition, the United States, each State thereof and the District of Columbia shall be deemed to constitute a single jurisdiction.

     “Foreign Subsidiary” means any Subsidiary other than a Domestic Subsidiary.

     “FRB” means the Board of Governors of the Federal Reserve System of the United States.

     “GAAP” means generally accepted accounting principles in the United States set forth in the opinions and pronouncements of the Accounting Principles Board and the American Institute of Certified Public Accountants and statements and pronouncements of the Financial Accounting Standards Board or such other principles as may be approved by a significant segment of the accounting profession in the United States, that are applicable to the circumstances as of the date of determination, consistently applied.

     “Governmental Authority” means the government of the United States or any other nation, or of any political subdivision thereof, whether state or local, and any agency, authority, instrumentality, regulatory body, court, central bank or other entity exercising executive, legislative, judicial, taxing, regulatory or administrative powers or functions of or pertaining to government (including any supra-national bodies such as the European Union or the European Central Bank).

     “Guarantee” means, as to any Person, (a) any obligation, contingent or otherwise, of such Person guaranteeing or having the economic effect of guaranteeing any Indebtedness or other obligation payable or performable by another Person (the “primary obligor”) in any manner, whether directly or indirectly, and including any obligation of such Person, direct or indirect, (i) to purchase or pay (or advance or supply funds for the purchase or payment of) such Indebtedness or other obligation, (ii) to purchase or lease property, securities or services for the purpose of assuring the obligee in respect of such Indebtedness or other obligation of the payment or performance of such Indebtedness or other obligation, (iii) to maintain working capital, equity capital or any other financial statement condition or liquidity or level of income or cash flow of the primary obligor so as to enable the primary obligor to pay such Indebtedness or other obligation, or (iv) entered into for the purpose of assuring in any other manner the obligee in respect of such Indebtedness or other obligation of the payment or performance thereof or to protect such obligee against loss in respect thereof (in whole or in part), or (b) any Lien on any assets of such Person securing any Indebtedness or other obligation of any other Person, whether or not such Indebtedness or other obligation is assumed by such Person (or any right, contingent

or otherwise, of any holder of such Indebtedness to obtain any such Lien). The amount of any Guarantee shall be deemed to be an amount equal to the stated or determinable amount of the related primary obligation, or portion thereof, in respect of which such Guarantee is made or, if not stated or determinable, the maximum reasonably anticipated liability in respect thereof as determined by the guaranteeing Person in good faith. The term “Guarantee” as a verb has a corresponding meaning.

     “Guarantor” means (a) as of the Closing Date, each of the Domestic Subsidiaries identified on Schedule 5.13, and (b) after the Closing Date, any other Subsidiary of the Company required to execute a Guaranty under Section 6.12 hereof.

     “Guaranty” means the Guaranty made by the Guarantors in favor of the Administrative Agent and the Lenders, substantially in the form of Exhibit E, and such additional guaranty agreements as may hereafter be executed.

     “Hazardous Materials” means all explosive or radioactive substances or wastes and all hazardous or toxic substances, wastes or other pollutants, including petroleum or petroleum distillates, asbestos or asbestos-containing materials, polychlorinated biphenyls, radon gas, infectious or medical wastes and all other substances or wastes of any nature regulated pursuant to any Environmental Law.

     “Hydrocarbon Interests” means all rights, titles, interests and estates now owned or hereafter acquired by the Borrower or any of its Subsidiaries in any and all oil, gas and other liquid or gaseous hydrocarbon properties and interests, including without limitation, mineral fee or lease interests, production sharing agreements, concession agreements, license agreements, service agreements, risk service agreements or similar Hydrocarbon interests granted by an appropriate Governmental Authority, farmout, overriding royalty and royalty interests, net profit interests, oil payments, production payment interests and similar interests in Hydrocarbons, including any reserved or residual interests of whatever nature.

     “Hydrocarbons” means oil, gas, casing head gas, condensate, distillate, liquid hydrocarbons, gaseous hydrocarbons, all products refined, separated, settled and dehydrated therefrom, including, without limitation, kerosene, liquefied petroleum gas, refined lubricating oils, diesel fuel, drip gasoline, natural gasoline, helium, sulfur and all other minerals.

     “Immaterial Subsidiary” means Ambar Lone Star Fluids Services LLC and any Subsidiary having total assets (real or personal, tangible or intangible) of less than $100,000.

     “Impacted Lender” means (a) any Lender that is a Defaulting Lender and (b) any Lender as to which (i) the Borrower, the Administrative Agent has a good faith belief that such Lender has defaulted in fulfilling its obligations under one or more other syndicated credit facilities or (ii) an entity that controls such Lender has been deemed insolvent or become subject to a bankruptcy or other similar proceeding.

     “Indebtedness” means, as to any Person at a particular time, without duplication, all of the following, whether or not included as indebtedness or liabilities in accordance with GAAP:

          (a) all obligations of such Person for borrowed money and all obligations of such Person evidenced by bonds, debentures, notes, loan agreements or other similar instruments;

          (b) (i) reimbursement obligations of such Person in respect of letters of credit (including standby and commercial), bankers’ acceptances, bank guaranties, surety bonds and similar instruments; and (ii) contingent obligations of such Person in respect of letters of credit (including standby and commercial), bankers’ acceptances, bank guaranties, surety bonds and similar instruments;

          (c) net obligations of such Person under any Swap Contract;

          (d) all obligations of such Person to pay the deferred purchase price of property or services (other than (i) trade accounts payable to a Person in the United States or Canada in the ordinary course of business and, in each case, not past due for more than 60 days, and (ii) trade accounts payable to a Person in a country other than the United States or Canada in the ordinary course of business and, in each case, not past due for more than 120 days); and

          (e) indebtedness (excluding prepaid interest thereon) secured by a Lien on property owned or being purchased by such Person (including indebtedness arising under conditional sales or other title retention agreements), whether or not such indebtedness shall have been assumed by such Person or is limited in recourse;

          (f) capital leases;

          (g) Off-Balance Sheet Liabilities;

          (h) obligations in respect of a forward sale of production for which such Person has received payment in advance other than on ordinary trade terms;

          (i) all obligations of such Person to purchase, redeem, retire, defease or otherwise make any payment in respect of any Equity Interest in such Person or any other Person, on a date certain and not subject to any contingencies, or at the option of the holder of such Equity Interest, valued, in the case of a redeemable preferred interest, at the greater of its voluntary or involuntary liquidation preference plus accrued and unpaid dividends; and

          (j) all Guarantees of such Person in respect of any of the foregoing.

     For all purposes hereof, the Indebtedness of any Person shall include the Indebtedness of any partnership or joint venture (other than a joint venture that is itself a corporation or limited liability company) in which such Person is a general partner or a joint venturer, unless such Indebtedness is expressly made non-recourse to such Person. The amount of any net obligation under any Swap Contract on any date shall be deemed to be the Swap Termination Value thereof as of such date. The amount of any capital lease or Synthetic Lease Obligation as of any date shall be deemed to be the amount of Attributable Indebtedness in respect thereof as of such date.

     “Indemnified Taxes” means Taxes other than Excluded Taxes.

     “Indemnitees” has the meaning specified in Section 10.04(b).

     “Interest Coverage Ratio” means, as of any date of determination, the ratio of (a) Consolidated EBITDA for the period of the four prior fiscal quarters ending on such date to (b) Consolidated Interest Charges for such period.

     “Interest Payment Date” means, (a) as to any Loan other than a Base Rate Loan, the last day of each Interest Period applicable to such Loan and the Maturity Date; provided, however, that if any Interest Period for a Eurodollar Rate Loan exceeds three months, the respective dates that fall every three months after the beginning of such Interest Period shall also be Interest Payment Dates; and (b) as to any Base Rate Loan, the last Business Day of each March, June, September and December and the Maturity Date.

     “Interest Period” means, as to each Eurodollar Rate Loan, the period commencing on the date such Eurodollar Rate Loan is disbursed or converted to or continued as a Eurodollar Rate Loan and ending on the date one, three or six months thereafter, as selected by the Borrower in its Loan Notice; provided that:

          (a) any Interest Period that would otherwise end on a day that is not a Business Day shall be extended to the next succeeding Business Day unless such Business Day falls in another calendar month, in which case such Interest Period shall end on the next preceding Business Day;

          (b) any Interest Period that begins on the last Business Day of a calendar month (or on a day for which there is no numerically corresponding day in the calendar month at the end of such Interest Period) shall end on the last Business Day of the calendar month at the end of such Interest Period; and

          (c) no Interest Period shall extend beyond the Maturity Date.

     “Investment” means, as to any Person, any direct or indirect acquisition or investment by such Person, whether by means of (a) the purchase or other acquisition of capital stock or other securities of another Person, or (b) a loan, advance or capital contribution to, Guarantee or assumption of debt of, or purchase or other acquisition of any other debt or equity participation or interest in, another Person, including any partnership or joint venture interest in such other Person and any arrangement pursuant to which the investor Guarantees Indebtedness of such other Person. For purposes of covenant compliance, the amount of any Investment shall be the amount actually invested, without adjustment for subsequent increases or decreases in the value of such Investment. The term “Investment” does not include (a) investment in cash equivalents or short-term marketable debt securities; (b) extensions of credit in the nature of accounts receivable or notes receivable arising from the grant of trade credit in the ordinary course of business, or (c) investments in direct ownership interests in Oil and Gas Properties (and related personal property used in the operating, working or development thereof), net revenue interests, royalty interests, or related to Oil and Gas Agreements, or other similar arrangements in the ordinary course of the Borrower’s business which are usual and customary in the ordinary course of the oil and gas exploration and production business. As used in this definition, “Person” does not include a natural person.

     “IRS” means the United States Internal Revenue Service.

     “Joint Venture” means any Person (A) in which the Borrower or a Subsidiary invests cash, or to which the Borrower or a Subsidiary transfers assets (other than in the ordinary course of business) used or useful in the Borrower’s or such Subsidiary’s business, and the Borrower or such Subsidiary receives in return ownership interests in such Person, (B) that carries on a trade or business that is the same or similar to the business carried on by the Borrower and its Subsidiaries, (C) some portion of the equity interests (excluding director’s qualifying shares or similar ownership qualifications applying to such Person’s board of directors or similar policy making group) of which are owned by a Person or Persons other than the Borrower or its Subsidiaries, and (D) the senior management functions of which are carried out by a group that includes officers or directors of the Borrower or a Subsidiary; provided, however, that a Joint Venture shall not include:

          (a) a natural person, or

          (b) a Person having a class of common stock (a) that is registered under the Securities Exchange Act of 1934, (b) that is publicly traded on a recognized national market, including electronic markets such as the NASDAQ Stock Market, or (c) for which bid or ask prices are quoted in the publication known as the pink sheets or similar reporting service for thinly traded companies.

     “Laws” means, collectively, all international, foreign, Federal, state and local statutes, treaties, rules, guidelines, regulations, ordinances, codes and administrative or judicial precedents or authorities, including the interpretation or administration thereof by any Governmental Authority charged with the enforcement, interpretation or administration thereof, and all applicable administrative orders, directed duties, requests, licenses, authorizations and permits of, and agreements with, any Governmental Authority.

     “Lender” has the meaning specified in the introductory paragraph hereto and, as the context requires.

     “Lending Office” means, as to any Lender, the office or offices of such Lender described as such in such Lender’s Administrative Questionnaire, or such other office or offices as a Lender may from time to time designate by notice to the Borrower and the Administrative Agent.

     “Lien” means any mortgage, pledge, hypothecation, assignment, deposit arrangement, encumbrance, lien (statutory or other), charge, or preference, priority or other security interest or preferential arrangement in the nature of a security interest of any kind or nature whatsoever (including any conditional sale or other title retention agreement, any easement, right of way or other encumbrance on title to real property, and any financing lease having substantially the same economic effect as any of the foregoing).

     “Loan” has the meaning specified in Section 2.01.

     “Loan Documents” means this Agreement, each Note, the Fee Letter and the Guaranty.

     “Loan Notice” means a notice of (a) a Borrowing, (b) a conversion of Loans from one Type to the other, or (c) a continuation of Eurodollar Rate Loans, pursuant to Section 2.02(a), which, if in writing, shall be substantially in the form of Exhibit A.

     “Loan Parties” means, collectively, the Borrower and each Guarantor.

     “Material Adverse Effect” means (a) a material adverse change in, or a material adverse effect upon, the operations, business, properties, liabilities (actual or contingent), condition (financial or otherwise) of the Borrower and its Subsidiaries, taken as a whole; (b) a material impairment of the ability of the Loan Parties collectively to perform their payment or other material obligations under any Loan Document; (c) a material adverse effect upon the legality, validity, binding effect or enforceability against the Borrower of any Loan Document to which it is a party, or (d) a material adverse effect upon the legality, validity, binding effect or enforceability against a Guarantor of any Loan Document to which it is a party if such material adverse effect constitutes a material adverse effect on the legality, validity, binding effect or enforceability of the Loan Documents against the Borrower and the Guarantors considered as a whole.

     “Maturity Date” means the day immediately preceding the one year anniversary of the Closing Date.

     “Multiemployer Plan” means any employee benefit plan of the type described in Section 4001(a)(3) of ERISA, to which the Borrower or any ERISA Affiliate makes or is obligated to make contributions, or with respect to which the Borrower or any ERISA Affiliate may have any liability, contingent or otherwise.

     “Net Debt Proceeds” means cash proceeds received from the issuance or incurrence by the Borrower or any Subsidiary of (a) during the period from and including the Closing Date to September 15, 2010 (or October 15, 2010 upon the Administrative Agent’s receipt of the Commitment Extension Fee referred to in the Fee Letter), Indebtedness with respect to either (i) promissory notes issued in a public offering or a Rule 144A or other private placement or (ii) the funded term loan portion of the Permanent Credit Facility and (b) thereafter, any funded Indebtedness for borrowed money (other than the Existing Credit Agreement and any purchase money Indebtedness), in each case, net of underwriting discounts and commissions and out-of-pocket costs and expenses and disbursements paid or incurred by the Borrower or any of its Subsidiaries in connection therewith.

     “Net Proceeds” means with respect to any Asset Disposition, the sum of all proceeds in cash, checks or other cash equivalents as and when received by the Person making such Asset Disposition less: (a) the direct costs relating to such Asset Disposition, (b) sale, use or other transaction taxes incurred as a result thereof, and (c) amounts required to be applied to repay principal, interest and prepayment premiums and penalties on Indebtedness (other than the Loans) secured by a Lien on the property which is the subject of such Asset Disposition.

     “Notes” means a promissory note made by the Borrower in favor of a Lender evidencing Loans made by such Lender, substantially in the form of Exhibit B.

     “Obligations” means all advances to, and debts, liabilities, obligations, covenants and duties of, any Loan Party arising under any Loan Document or otherwise with respect to any Loan, whether direct or indirect (including those acquired by assumption), absolute or contingent, due or to become due, now existing or hereafter arising and including interest and fees that accrue after the commencement by or against any Loan Party or any Affiliate thereof of any proceeding under any Debtor Relief Laws naming such Person as the debtor in such proceeding, regardless of whether such interest and fees are allowed claims in such proceeding.

     “Off-Balance Sheet Liabilities” means, with respect to any Person as of any date of determination thereof, without duplication and to the extent not included as a liability on the consolidated balance sheet of such Person and its Subsidiaries in accordance with GAAP: (a) with respect to any asset securitization transaction (including any accounts receivable purchase facility) (i) the unrecovered investment of purchasers or transferees of assets so transferred provided that such investment is ultimately due for repayment at some date certain, and (ii) any other payment, recourse, repurchase, hold harmless, indemnity or similar obligation of such Person or any of its Subsidiaries in respect of assets transferred or payments made in respect thereof, other than limited recourse provisions that are customary for transactions of such type and that neither (x) have the effect of limiting the loss or credit risk of such purchasers or transferees with respect to payment or performance by the obligors of the assets so transferred nor (y) impair the characterization of the transaction as a true sale under applicable Laws (including Debtor Relief Laws); (b) any Synthetic Lease Obligation; (c) the monetary obligations under any sale and leaseback transaction which does not create a liability on the consolidated balance sheet of such Person and its Subsidiaries; or (d) any other monetary obligation arising with respect to any other transaction which (i) is characterized as indebtedness for tax purposes but not for accounting purposes in accordance with GAAP or (ii) is the functional equivalent of or takes the place of borrowing but which does not constitute a liability on the consolidated balance sheet of such Person and its Subsidiaries (for purposes of this clause (d), any transaction structured to provide tax deductibility as interest expense of any dividend, coupon or other periodic payment will be deemed to be the functional equivalent of a borrowing).

     “Oil and Gas Agreements” means operating agreements, processing agreements, farm-out and farm-in agreements, development agreements, area of mutual interest agreements, contracts for the gathering and/or transportation of oil and natural gas, unitization agreements, pooling arrangements, joint bidding agreements, joint venture agreements, participation agreements, surface use agreements, service contracts, leases and subleases of Oil and Gas Properties or other similar agreements which are customary in the oil and gas business, howsoever designated, in each case made or entered into in the ordinary course of the oil and gas business as conducted by the Borrower and its Subsidiaries.

     “Oil and Gas Properties” means (a) Hydrocarbon Interests; (b) the Property now or hereafter pooled or unitized with Hydrocarbon Interests; (c) all presently existing or future unitization, pooling agreements and declarations of pooled units and the units created thereby (including, without limitation, all units created under orders, regulations and rules of any Governmental Authority) which may affect all or any portion of the Hydrocarbon Interests; (d) all operating agreements, contracts and other agreements which relate to any of the Hydrocarbon Interests or the production, sale, purchase, exchange or processing of Hydrocarbons from or attributable to such Hydrocarbon Interest; (e) all Hydrocarbons in and under and which may be

produced and saved or attributable to the Hydrocarbon Interests, the lands covered thereby and all oil in tanks and all rents, issues, profits, proceeds, products, revenues and other income from or attributable to the Hydrocarbon Interests; and (f) all tenements, hereditaments, appurtenances and property in any manner appertaining, belonging, affixed or incidental to the Hydrocarbon Interests, and any and all property, now owned or hereinafter acquired and situated upon, used, held for use or useful in connection with the operating, working or development of any of such Hydrocarbon Interests or property (excluding drilling rigs, automotive equipment or other personal property which may be on such premises for the purpose of drilling a well or for other similar temporary uses) and including any and all oil wells, gas wells, injection wells or other wells, buildings, structures, fuel separators, liquid extraction plants, plant compressors, pumps, pumping units, field gathering systems, tanks and tank batteries, fixtures, valves, fittings, machinery and parts, engines, boilers, meters, apparatus, equipment, appliances, tools, implements, cables, wires, towers, casing, tubing and rods, surface leases, rights-of-way, easements and servitudes together with all additions, substitutions, replacements, accessions and attachments to any and all of the foregoing.

     “Organization Documents” means, (a) with respect to any corporation, the certificate or articles of incorporation and the bylaws (or equivalent or comparable constitutive documents with respect to any non-U.S. jurisdiction); (b) with respect to any limited liability company, the certificate or articles of formation or organization and operating or limited liability company agreement; and (c) with respect to any partnership, joint venture, trust or other form of business entity, the partnership, joint venture or other applicable agreement of formation or organization and any agreement, instrument, filing or notice with respect thereto filed in connection with its formation or organization with the applicable Governmental Authority in the jurisdiction of its formation or organization and, if applicable, any certificate or articles of formation or organization of such entity.

     “Other Taxes” means all present or future stamp or documentary taxes or any other excise or property taxes, charges or similar levies (other than Excluded Taxes) arising from any payment made hereunder or under any other Loan Document or from the execution, delivery or enforcement of, or otherwise with respect to, this Agreement or any other Loan Document, except to the extent such taxes, charges or similar levies are attributable to a Lender’s failure to comply with Section 3.01(e).

     “Outstanding Amount” means with respect to Loans on any date, the aggregate outstanding principal amount thereof after giving effect to any borrowings and prepayments or repayments of Loans occurring on such date.

     “Participant” has the meaning specified in Section 10.06(d).

     “PBGC” means the Pension Benefit Guaranty Corporation.

     “Pension Plan” means any “employee pension benefit plan” (as such term is defined in Section 3(2) of ERISA), other than a Multiemployer Plan, that is subject to Title IV of ERISA and is sponsored or maintained by the Borrower or any ERISA Affiliate or to which the Borrower or any ERISA Affiliate contributes or has an obligation to contribute, or in the case of

a multiple employer or other plan described in Section 4064(a) of ERISA, with respect to which the Borrower or any ERISA Affiliate, may have any liability, contingent or otherwise.

     “Permanent Credit Facility” means a bank credit facility that refinances the Indebtedness under the Existing Credit Agreement.

     “Person” means any natural person, corporation, limited liability company, trust, joint venture, association, company, partnership, Governmental Authority or other entity.

     “Plan” means any “employee benefit plan” (as such term is defined in Section 3(3) of ERISA) established by the Borrower or, with respect to any such plan that is subject to Section 412 of the Code or Title IV of ERISA, any ERISA Affiliate.

     “Qualified Investment” means expenditures incurred by the Borrower or any Subsidiary in order to acquire (a) assets of the same type as those subject to such Reinvestment Event; or (b) equipment, real property, or other fixed or capital assets owned (or to be owned) by and used (or to be used) in the business of the Borrower and its Subsidiaries.

     “Register” has the meaning specified in Section 10.06(c).

     “Reinvestment Deferred Amount” means with respect to an Asset Disposition, the aggregate Net Proceeds received by the Borrower or any of its Subsidiaries in connection therewith that are specified in a Reinvestment Notice as not being initially subject to Section 2.05(a) as a result of the delivery of such Reinvestment Notice.

     “Reinvestment Event” means any Asset Disposition in respect of which the Borrower has delivered a Reinvestment Notice.

     “Reinvestment Notice” means a written notice executed by the Borrower stating that no Default or Event of Default has occurred and is continuing and stating that the Borrower and its Subsidiaries intend and expect to use all or a specified portion of the Net Proceeds of a Reinvestment Event specified in such notice to make a Qualified Investment.

     “Reinvestment Prepayment Amount” means with respect to any Reinvestment Event, the Reinvestment Deferred Amount relating thereto less the portion, if any, thereof expended prior to the relevant Reinvestment Prepayment Date to make a Qualified Investment.

     “Reinvestment Prepayment Date” means, with respect to any Reinvestment Event, the earlier of (a) the 180th day immediately after the consummation of such Reinvestment Event and (b) the date on which the Borrower shall have determined not to make a Qualified Investment in respect of such Reinvestment Event.

     “Related Parties” means, with respect to any Person, such Person’s Affiliates and the partners, directors, officers, employees, agents and advisors of such Person and of such Person’s Affiliates.

     “Reportable Event” means any of the events set forth in Section 4043(c) of ERISA, other than events for which the 30-day notice period has been waived.

     “Request for Credit Extension” means with respect to a Borrowing, conversion or continuation of Loans, a Loan Notice.

     “Required Lenders” means, as of any date of determination, Lenders having more than 50% of the Aggregate Commitments or, if the commitment of each Lender to make Loans has been terminated pursuant to Section 8.02, Lenders holding in the aggregate more than 50% of the Total Outstandings.

     “Responsible Officer” means the chief executive officer, president, chief financial officer, treasurer or assistant treasurer of a Loan Party.

     “SEC” means the Securities and Exchange Commission, or any Governmental Authority succeeding to any of its principal functions.

     “Sellers” means Key Energy Pressure Pumping Services, LLC, a Texas limited liability company, and Key Electric Wireline Services, LLC, a Delaware limited liability company.

     “Shareholders’ Equity” means, as of any date of determination, consolidated shareholders’ equity of the Borrower and its Subsidiaries as of that date determined in accordance with GAAP.

     “Solvent” means, as to any Person, on the date of any determinations, that on such date the fair value of the property of such Person, exclusive of property transferred, concealed or removed with intent to hinder, delay or defraud such entity’s creditors and property that may be exempted from property of a bankruptcy estate pursuant to Section 522 of the Bankruptcy Code of 1978, as amended, is greater than the total amount of the debts of such Person.

     “SPC” has the meaning specified in Section 10.06(h).

     “Subsidiary” of a Person means a corporation, partnership, joint venture, limited liability company or other business entity of which a majority of the shares of securities or other interests having ordinary voting power for the election of directors or other governing body (other than securities or interests having such power only by reason of the happening of a contingency) are at the time beneficially owned, or the management of which is otherwise controlled, directly, or indirectly through one or more intermediaries, or both, by such Person. Unless otherwise specified, all references herein to a “Subsidiary” or to “Subsidiaries” shall refer to a Subsidiary or Subsidiaries of the Borrower.

     “Swap Contract” means (a) any and all rate swap transactions, basis swaps, credit derivative transactions, forward rate transactions, commodity swaps, commodity options, forward commodity contracts, equity or equity index swaps or options, bond or bond price or bond index swaps or options or forward bond or forward bond price or forward bond index transactions, interest rate options, forward foreign exchange transactions, cap transactions, floor transactions, collar transactions, currency swap transactions, cross-currency rate swap transactions, currency options, spot contracts, or any other similar transactions or any combination of any of the foregoing (including any options to enter into any of the foregoing), whether or not any such transaction is governed by or subject to any master agreement, and (b) any and all transactions of any kind, and the related confirmations, which are subject to the terms and conditions of, or governed by, any form of master agreement published by the International

Swaps and Derivatives Association, Inc., any International Foreign Exchange Master Agreement, or any other master agreement (any such master agreement, together with any related schedules, a “Master Agreement”), including any such obligations or liabilities under any Master Agreement.

     “Swap Termination Value” means, in respect of any one or more Swap Contracts, after taking into account the effect of any legally enforceable netting agreement relating to such Swap Contracts, (a) for any date on or after the date such Swap Contracts have been closed out and termination values determined in accordance therewith, such termination values, and (b) for any date prior to the date referenced in clause (a), the amounts determined as the mark-to-market values for such Swap Contracts, as determined based upon one or more mid-market or other readily available quotations provided by any recognized dealer in such Swap Contracts (which may include a Lender or any Affiliate of a Lender).

     “Synthetic Lease Obligation” means the monetary obligation of a Person under (a) a so-called synthetic, off-balance sheet or tax retention lease, or (b) an agreement for the use or possession of property creating obligations that do not appear on the balance sheet of such Person but which, upon the insolvency or bankruptcy of such Person, would be characterized as the indebtedness of such Person (without regard to accounting treatment).

     “Taxes” means all present or future taxes, levies, imposts, duties, deductions, withholdings, assessments, fees or other charges imposed by any Governmental Authority, including any interest, additions to tax or penalties applicable thereto.

     “Threshold Amount” means $20,000,000.

     “Total Capital” means, at any time, the sum of (a) Consolidated Funded Indebtedness and (b) Consolidated Net Worth.

     “Total Outstandings” means the aggregate Outstanding Amount of all Loans.

     “Type” means, with respect to a Loan, its character as a Base Rate Loan or a Eurodollar Rate Loan.

     “Unfunded Pension Liability” means the excess of a Pension Plan’s benefit liabilities under Section 4001(a)(16) of ERISA as of the most recently completed fiscal year of the Pension Plan, over the current value of that Pension Plan’s assets as of the most recently completed fiscal year of the Pension Plan, determined in accordance with the assumptions used for funding the Pension Plan pursuant to Section 412 of the Code for the applicable plan year.

     “United States” and “U.S.” mean the United States of America.

     “Wells Fargo” means Wells Fargo Bank, N.A. and its successors.

     1.02 Other Interpretive Provisions. With reference to this Agreement and each other Loan Document, unless otherwise specified herein or in such other Loan Document:

          (a) The definitions of terms herein shall apply equally to the singular and plural forms of the terms defined. Whenever the context may require, any pronoun shall include the corresponding masculine, feminine and neuter forms. The words “include,” “includes” and “including” shall be deemed to be followed by the phrase “without limitation.” The word “will” shall be construed to have the same meaning and effect as the word “shall.” Unless the context requires otherwise, (i) any definition of or reference to any agreement, instrument or other document (including any Organization Document) shall be construed as referring to such agreement, instrument or other document as from time to time amended, supplemented or otherwise modified (subject to any restrictions on such amendments, supplements or modifications set forth herein or in any other Loan Document), (ii) any reference herein to any Person shall be construed to include such Person’s successors and assigns, (iii) the words “herein,” “hereof” and “hereunder,” and words of similar import when used in any Loan Document, shall be construed to refer to such Loan Document in its entirety and not to any particular provision thereof, (iv) all references in a Loan Document to Articles, Sections, Exhibits and Schedules shall be construed to refer to Articles and Sections of, and Exhibits and Schedules to, the Loan Document in which such references appear, (v) any reference to any law shall include all statutory and regulatory provisions consolidating, amending replacing or interpreting such law and any reference to any law or regulation shall, unless otherwise specified, refer to such law or regulation as amended, modified or supplemented from time to time, and (vi) the words “asset” and “property” shall be construed to have the same meaning and effect and to refer to any and all tangible and intangible assets and properties, including cash, securities, accounts and contract rights.

          (b) In the computation of periods of time from a specified date to a later specified date, the word “from” means “from and including;” the words “to” and “until” each mean “to but excluding;” and the word “through” means “to and including.”

          (c) Section headings herein and in the other Loan Documents are included for convenience of reference only and shall not affect the interpretation of this Agreement or any other Loan Document.

     1.03 Accounting Terms. (a) Generally. All accounting terms not specifically or completely defined herein shall be construed in conformity with, and all financial data (including financial ratios and other financial calculations) required to be submitted pursuant to this Agreement shall be calculated and prepared in conformity with, GAAP applied on a consistent basis, as in effect from time to time, applied in a manner consistent with that used in preparing the Audited Financial Statements, except as otherwise specifically prescribed herein.

          (b) Changes in GAAP. Except as otherwise expressly provided herein, all terms of an accounting or financial nature shall be construed in accordance with GAAP, as in effect from time to time; provided that, if the Borrower notifies the Administrative Agent that the Borrower requests an amendment to any provision hereof to eliminate the effect of any change occurring after the date hereof in GAAP (including but not limited to any Statement of Financial Accounting Standards) or in the application thereof on the operation of such provision (or if the Administrative Agent notifies the Borrower that the Required Lenders request an amendment to any provision hereof for such purpose), regardless of whether any such notice is given before or after such change in GAAP or in the application thereof, then (a) such provision shall be

interpreted on the basis of GAAP as in effect and applied immediately before such change shall have become effective until such notice shall have been withdrawn or such provision amended in accordance herewith, and (b) if such change in GAAP would affect the computation of any financial ratio or requirement set forth in this Agreement, then if so requested by the Administrative Agent, the Borrower shall provide to the Administrative Agent and the Lenders financial statements and other documents required under this Agreement or as reasonably requested setting forth a reconciliation between calculations of such ratio or requirement made before and after giving effect to such change in GAAP.

     1.04 Rounding. Any financial ratios required to be maintained by the Borrower pursuant to this Agreement shall be calculated by dividing the appropriate component by the other component, carrying the result to one place more than the number of places by which such ratio is expressed herein and rounding the result up or down to the nearest number (with a rounding-up if there is no nearest number).

     1.05 Times of Day. Unless otherwise specified, all references herein to times of day shall be references to Central time (daylight or standard, as applicable).

     1.06 Responsible Officer. Any document delivered hereunder that is signed by a Responsible Officer of a Loan Party shall be conclusively presumed to have been authorized by all necessary corporate, partnership and/or other action on the part of such Loan Party and such Responsible Officer shall be conclusively presumed to have acted on behalf of such Loan Party.

ARTICLE II

THE COMMITMENTS AND CREDIT EXTENSIONS

     2.01 Loans. Subject to the terms and conditions set forth herein, each Lender severally agrees to make a single term loan (each such loan, a “Loan”) to the Borrower on the Closing Date in an aggregate amount not to exceed the amount of such Lender’s Commitment; provided, however, that the Total Outstandings shall not exceed the Aggregate Commitments. Principal repayments made after the Closing Date may not be reborrowed. Loans may be Base Rate Loans or Eurodollar Rate Loans, as further provided herein.

     2.02 Borrowings, Conversions and Continuations of Loans.

          (a) Each Borrowing, each conversion of Loans from one Type to the other, and each continuation of Eurodollar Rate Loans shall be made upon the Borrower’s irrevocable notice to the Administrative Agent, which may be given by telephone. Each such notice must be received by the Administrative Agent not later than 10:00 a.m. (i) three Business Days prior to the requested date of any Borrowing of, conversion to or continuation of Eurodollar Rate Loans or of any conversion of Eurodollar Rate Loans to Base Rate Loans, and (ii) on the requested date of any Borrowing of Base Rate Loans. Each telephonic notice by the Borrower pursuant to this Section 2.02(a) must be confirmed promptly by delivery to the Administrative Agent of a written Loan Notice, appropriately completed and signed by a Responsible Officer of the Borrower. Each Borrowing of, conversion to or continuation of Eurodollar Rate Loans shall be in a principal amount of $5,000,000 or a whole multiple of $1,000,000 in excess thereof. Each

Borrowing of or conversion to Base Rate Loans shall be in a principal amount of $500,000 or a whole multiple of $100,000 in excess thereof. Each Loan Notice (whether telephonic or written) shall specify (i) whether the Borrower is requesting a Borrowing, a conversion of Loans from one Type to the other, or a continuation of Eurodollar Rate Loans, (ii) the requested date of the Borrowing, conversion or continuation, as the case may be (which shall be a Business Day), (iii) the principal amount of Loans to be borrowed, converted or continued, (iv) the Type of Loans to be borrowed or to which existing Loans are to be converted, and (v) if applicable, the duration of the Interest Period with respect thereto. If the Borrower fails to specify a Type of Loan in a Loan Notice or if the Borrower fails to give a timely notice requesting a conversion or continuation, then the applicable Loans shall be made as, or converted to, Base Rate Loans. Any such automatic conversion to Base Rate Loans shall be effective as of the last day of the Interest Period then in effect with respect to the applicable Eurodollar Rate Loans. If the Borrower requests a Borrowing of, conversion to, or continuation of Eurodollar Rate Loans in any such Loan Notice, but fails to specify an Interest Period, it will be deemed to have specified an Interest Period of one month.

          (b) Following receipt of a Loan Notice, the Administrative Agent shall promptly notify, on the same day that the request is received from the Borrower, each Lender of the amount of its Applicable Percentage of the applicable Loans, and if no timely notice of a conversion or continuation is provided by the Borrower, the Administrative Agent shall notify each Lender of the details of any automatic conversion to Base Rate Loans described in the preceding subsection. In the case of a Borrowing, each Lender shall make the amount of its Applicable Percentage of the Loan available to the Administrative Agent in immediately available funds at the Administrative Agent’s Office not later than 2:00 p.m. on the Business Day specified in the applicable Loan Notice. Upon satisfaction of the applicable conditions set forth in Section 4.01, the Administrative Agent shall make all funds so received available to the Borrower in like funds as received by the Administrative Agent either by (i) crediting the account of the Borrower on the books of Wells Fargo with the amount of such funds or (ii) wire transfer of such funds, in each case in accordance with instructions provided to (and reasonably acceptable to) the Administrative Agent by the Borrower.

          (c) Except as otherwise provided herein, a Eurodollar Rate Loan may be continued or converted only on the last day of an Interest Period for such Eurodollar Rate Loan. During the existence of a Default, no Loans may be requested as, converted to or continued as Eurodollar Rate Loans without the consent of the Required Lenders.

          (d) The Administrative Agent shall promptly notify the Borrower and the Lenders of the interest rate applicable to any Interest Period for Eurodollar Rate Loans upon determination of such interest rate. At any time that Base Rate Loans are outstanding, the Administrative Agent shall notify the Borrower and the Lenders of any change in Wells Fargo’s prime rate used in determining the Base Rate promptly following the public announcement of such change.

          (e) After giving effect to all Borrowings, all conversions of Loans from one Type to the other, and all continuations of Loans as the same Type, there shall not be more than six Interest Periods in effect with respect to Loans.

     2.03 [Reserved].

     2.04 Voluntary Prepayments. The Borrower may, upon notice to the Administrative Agent, at any time or from time to time voluntarily prepay Loans in whole or in part without premium or penalty; provided that (i) such notice must be received by the Administrative Agent not later than 10:00 a.m. (A) three Business Days prior to any date of prepayment of Eurodollar Rate Loans and (B) on the date of prepayment of Base Rate Loans; (ii) any prepayment of Eurodollar Rate Loans shall be in a principal amount of $5,000,000 or a whole multiple of $1,000,000 in excess thereof; and (iii) any prepayment of Base Rate Loans shall be in a principal amount of $500,000 or a whole multiple of $100,000 in excess thereof or, in each case, if less, the entire principal amount thereof then outstanding. Each such notice shall specify the date (which shall be a Business Day) and amount of such prepayment, the Type(s) of Loans to be prepaid and shall be substantially in the form of Exhibit G. The Administrative Agent will promptly notify each Lender of its receipt of each such notice, and of the amount of such Lender’s Applicable Percentage of such prepayment. If such notice is given by the Borrower, the Borrower shall make such prepayment and the payment amount specified in such notice shall be due and payable on the date specified therein. Any prepayment of a Loan shall be accompanied by all accrued interest to the date of prepayment on the amount prepaid, and, in the case of Eurodollar Rate Loans, any additional amounts required pursuant to Section 3.05. Each such prepayment shall be applied to the Loans of the Lenders in accordance with their respective Applicable Percentages.

     2.05 Mandatory Prepayments.

          (a) Asset Dispositions. If the Borrower or any of its Subsidiaries shall at any time or from time to time make an Asset Disposition then (A) the Borrower shall promptly notify the Administrative Agent of such Asset Disposition (including the amount of the estimated Net Proceeds to be received by the Borrower and/or any of its Subsidiaries in respect thereof) and (B) promptly upon receipt by the Borrower and/or any of its Subsidiaries of the Net Proceeds of such Asset Disposition (unless the Borrower has delivered a Reinvestment Notice to the Administrative Agent), the Borrower shall prepay the Loans in an aggregate principal amount equal to 100% of such Net Proceeds; provided, however, that, on the Reinvestment Prepayment Date in respect of any Reinvestment Event, the Borrower shall prepay the Loans in an aggregate principal amount equal to such Reinvestment Prepayment Amount if greater than zero.

          (b) Debt Issuance. Promptly upon the receipt by the Borrower or any of its Subsidiaries of any Net Debt Proceeds, the Borrower shall prepay Loans in an aggregate principal amount equal to 100% of such Net Debt Proceeds.

          (c) Equity Issuance. Promptly upon receipt by the Borrower of any Equity Issuance Proceeds, the Borrower shall prepay Loans in an aggregate principal amount equal to 100% of such Equity Issuance Proceeds.

          (d) Accrued Interest; Ratable Payments; Application of Payments. Each prepayment pursuant to this Section 2.05 shall be accompanied by accrued interest on the amount prepaid to the date of such prepayment and amounts, if any, required to be paid pursuant to Section 3.05 as a result of such prepayment being made on such date. Each such prepayment

shall be applied to the Loans in accordance with the Lenders’ respective Applicable Percentages, until all of the Loans are repaid in full. All prepayments of Loans made pursuant to Section 2.05 shall be applied to the ratable repayment of the Loans, until all such Loans are repaid in full.

          (e) Change of Control. Promptly upon the Change of Control of the Borrower, the Borrower shall prepay the Loans in full.

     2.06 [Reserved].

     2.07 Repayment of Loans. The Borrower shall repay to the Lenders on the Maturity Date the aggregate principal amount of Loans outstanding on such date.

     2.08 Interest.

          (a) Subject to the provisions of subsection (b) below, (i) each Eurodollar Rate Loan shall bear interest on the outstanding principal amount thereof for each Interest Period at a rate per annum equal to the Eurodollar Rate for such Interest Period plus the Applicable Rate; and (ii) each Base Rate Loan shall bear interest on the outstanding principal amount thereof from the applicable borrowing date at a rate per annum equal to the Base Rate plus the Applicable Rate.

          (b) (i) If any amount of principal of any Loan is not paid when due (without regard to any applicable grace periods), whether at stated maturity, by acceleration or otherwise, such amount shall thereafter, so long as such amount remains unpaid, bear interest at a fluctuating interest rate per annum at all times equal to the Default Rate to the fullest extent permitted by applicable Laws.

          (ii) If any Event of Default under Section 8.01(f) occurs and is continuing, then the Borrower shall pay interest on the principal amount of all outstanding Obligations hereunder at a fluctuating interest rate per annum at all times equal to the Default Rate to the fullest extent permitted by applicable Laws.

          (iii) If any amount (other than principal of any Loan) payable by the Borrower under any Loan Document is not paid when due (without regard to any applicable grace periods), whether at stated maturity, by acceleration or otherwise, then upon the request of the Required Lenders, such amount shall thereafter bear interest at a fluctuating interest rate per annum at all times equal to the Default Rate to the fullest extent permitted by applicable Laws.

          (iv) Upon the request of the Required Lenders, so long as any Event of Default is continuing (except as set forth in clause (ii) above), the Borrower shall pay interest on the principal amount of all outstanding Obligations hereunder at a fluctuating interest rate per annum at all times equal to the Default Rate to the fullest extent permitted by applicable Laws.

          (v) Accrued and unpaid interest on past due amounts (including interest on past due interest) shall be due and payable upon demand.

          (c) Interest on each Loan shall be due and payable in arrears on each Interest Payment Date applicable thereto and at such other times as may be specified herein. Interest hereunder shall be due and payable in accordance with the terms hereof before and after judgment, and before and after the commencement of any proceeding under any Debtor Relief Law.

     2.09 Fees. Except as provided in Section 10.13, the Borrower shall pay to Wells Fargo for its own account fees in the amounts and at the times specified in the Fee Letter. Such fees shall be fully earned when paid and shall not be refundable for any reason whatsoever.

     2.10 Computation of Interest and Fees. All computations of interest for Base Rate Loans when the Base Rate is determined by Wells Fargo’s “prime rate” shall be made on the basis of a year of 365 or 366 days, as the case may be, and actual days elapsed. All other computations of fees and interest shall be made on the basis of a 360-day year and actual days elapsed (which results in more fees or interest, as applicable, being paid than if computed on the basis of a 365-day year). Interest shall accrue on each Loan for the day on which the Loan is made, and shall not accrue on a Loan, or any portion thereof, for the day on which the Loan or such portion is paid, provided that any Loan that is repaid on the same day on which it is made shall, subject to Section 2.12(a), bear interest for one day. Each determination by the Administrative Agent of an interest rate or fee hereunder shall be presumed correct and binding for all purposes, absent manifest error.

     2.11 Evidence of Debt. The Credit Extensions made by each Lender shall be evidenced by one or more accounts or records maintained by such Lender and by the Administrative Agent in the ordinary course of business. The accounts or records maintained by the Administrative Agent and each Lender shall be presumed correct absent manifest error of the amount of the Credit Extensions made by the Lenders to the Borrower and the interest and payments thereon. Any failure to so record or any error in doing so shall not, however, limit or otherwise affect the obligation of the Borrower hereunder to pay any amount owing with respect to the Obligations. In the event of any conflict between the accounts and records maintained by any Lender and the accounts and records of the Administrative Agent in respect of such matters, the accounts and records of the Administrative Agent shall control in the absence of manifest error. Upon the request of any Lender made through the Administrative Agent, the Borrower shall execute and deliver to such Lender (through the Administrative Agent) a Note, which shall evidence such Lender’s Loans in addition to such accounts or records. Each Lender may attach schedules to its Note and endorse thereon the date, Type (if applicable), amount and maturity of its Loans and payments with respect thereto.

     2.12 Payments Generally; Administrative Agent’s Clawback.

          (a) General. All payments to be made by the Borrower shall be made without condition or deduction for any counterclaim, defense, recoupment or setoff. Except as otherwise expressly provided herein, all payments by the Borrower hereunder shall be made to the Administrative Agent, for the account of the respective Lenders to which such payment is owed, at the Administrative Agent’s Office in Dollars and in immediately available funds not later than 1:00 p.m. on the date specified herein. The Administrative Agent will promptly distribute to each Lender its Applicable Percentage (or other applicable share as provided herein) of such

payment in like funds as received by wire transfer to such Lender’s Lending Office. All payments received by the Administrative Agent after 1:00 p.m. shall be deemed received on the next succeeding Business Day and any applicable interest or fee shall continue to accrue. If any payment to be made by the Borrower shall come due on a day other than a Business Day, payment shall be made on the next following Business Day, and such extension of time shall be reflected in computing interest or fees, as the case may be.

          (b) (i) Funding by Lenders; Presumption by Administrative Agent. Unless the Administrative Agent shall have received notice from a Lender prior to the proposed date of any Borrowing that such Lender will not make available to the Administrative Agent such Lender’s share of such Borrowing, the Administrative Agent may assume that such Lender has made such share available on such date in accordance with Section 2.02 and may, in reliance upon such assumption, make available to the Borrower a corresponding amount. In such event, if a Lender has not in fact made its share of the applicable Borrowing available to the Administrative Agent, then the applicable Lender and the Borrower severally agree to pay to the Administrative Agent forthwith on demand such corresponding amount in immediately available funds with interest thereon, for each day from and including the date such amount is made available to the Borrower to but excluding the date of payment to the Administrative Agent, at (A) in the case of a payment to be made by such Lender, the greater of the Federal Funds Rate and a rate determined by the Administrative Agent in accordance with banking industry rules on interbank compensation and (B) in the case of a payment to be made by the Borrower, the interest rate applicable to Base Rate Loans. If the Borrower and such Lender shall pay such interest to the Administrative Agent for the same or an overlapping period, the Administrative Agent shall promptly remit to the Borrower the amount of such interest paid by the Borrower for such period. If such Lender pays its share of the applicable Borrowing to the Administrative Agent, then the amount so paid shall constitute such Lender’s Loan included in such Borrowing. Any payment by the Borrower shall be without prejudice to any claim the Borrower may have against a Lender that shall have failed to make such payment to the Administrative Agent.

          (ii) Payments by Borrower; Presumptions by Administrative Agent. Unless the Administrative Agent shall have received notice from the Borrower prior to the date on which any payment is due to the Administrative Agent for the account of the Lenders that the Borrower will not make such payment, the Administrative Agent may assume that the Borrower has made such payment on such date in accordance herewith and may, in reliance upon such assumption, distribute to the Lenders the amount due. In such event, if the Borrower has not in fact made such payment, then each of the Lenders severally agrees to repay to the Administrative Agent forthwith on demand the amount so distributed to such Lender in immediately available funds with interest thereon, for each day from and including the date such amount is distributed to it to but excluding the date of payment to the Administrative Agent, at the greater of the Federal Funds Rate and a rate determined by the Administrative Agent in accordance with banking industry rules on interbank compensation.

A notice of the Administrative Agent to any Lender or the Borrower with respect to any amount owing under this subsection (b) shall be presumed correct, absent manifest error.

          (c) Failure to Satisfy Conditions Precedent. If any Lender makes available to the Administrative Agent funds for any Loan to be made by such Lender as provided in the foregoing provisions of this Article II, and such funds are not made available to the Borrower by the Administrative Agent because the conditions to the applicable Credit Extension set forth in Article IV are not satisfied or waived in accordance with the terms hereof, the Administrative Agent shall return such funds (in like funds as received from such Lender) to such Lender, without interest.

          (d) Obligations of Lenders Several. The obligations of the Lenders hereunder to make Loans and to make payments pursuant to Section 10.04(c) are several and not joint. The failure of any Lender to make any Loan or to make any payment under Section 10.04(c) on any date required hereunder shall not relieve any other Lender of its corresponding obligation to do so on such date, and no Lender shall be responsible for the failure of any other Lender to so make its Loan, to purchase its participation or to make its payment under Section 10.04(c).

          (e) Funding Source. Nothing herein shall be deemed to obligate any Lender to obtain the funds for any Loan in any particular place or manner or to constitute a representation by any Lender that it has obtained or will obtain the funds for any Loan in any particular place or manner.

     2.13 Sharing of Payments by Lenders. If any Lender shall, by exercising any right of setoff or counterclaim or otherwise, obtain payment in respect of any principal of or interest on any of the Loans made by it resulting in such Lender’s receiving payment of a proportion of the aggregate amount of such Loans and accrued interest thereon greater than its pro rata share thereof as provided herein, then the Lender receiving such greater proportion shall (a) notify the Administrative Agent of such fact, and (b) purchase (for cash at face value) participations in the Loans of the other Lenders, or make such other adjustments as shall be equitable, so that the benefit of all such payments shall be shared by the Lenders ratably in accordance with the aggregate amount of principal of and accrued interest on their respective Loans and other amounts owing them, provided that:

          (a) if any such participations are purchased and all or any portion of the payment giving rise thereto is recovered, such participations shall be rescinded and the purchase price restored to the extent of such recovery, without interest; and

          (b) the provisions of this Section shall not be construed to apply to (x) any payment made by the Borrower pursuant to and in accordance with the express terms of this Agreement or (y) any payment obtained by a Lender as consideration for the assignment of or sale of a participation in any of its Loans to any assignee or participant, other than to the Borrower or any Subsidiary thereof (as to which the provisions of this Section shall apply).

     Each Loan Party consents to the foregoing and agrees, to the extent it may effectively do so under applicable law, that any Lender acquiring a participation pursuant to the foregoing arrangements may exercise against such Loan Party rights of setoff and counterclaim with respect to such participation as fully as if such Lender were a direct creditor of such Loan Party in the amount of such participation.

ARTICLE III

TAXES, YIELD PROTECTION AND ILLEGALITY

     3.01 Taxes.

          (a) Payments Free of Taxes. Any and all payments by or on account of any obligation of the Borrower hereunder or under any other Loan Document shall be made free and clear of and without reduction or withholding for any Indemnified Taxes or Other Taxes, provided that if the Borrower shall be required by applicable law to deduct any Indemnified Taxes or Other Taxes from such payments, then (i) the sum payable shall be increased as necessary so that after making all required deductions (including deductions applicable to additional sums payable under this Section) the Administrative Agent or Lender receives an amount equal to the sum it would have received had no such deductions been made, (ii) the Borrower shall make such deductions and (iii) the Borrower shall timely pay the full amount deducted to the relevant Governmental Authority in accordance with applicable law.

          (b) Payment of Other Taxes by the Borrower. Without limiting the provisions of subsection (a) above, the Borrower shall timely pay any Other Taxes to the relevant Governmental Authority in accordance with applicable law, to the extent such Other Taxes are imposed on the Borrower or any obligation of it hereunder under applicable law.

          (c) Indemnification by the Borrower. The Borrower shall indemnify the Administrative Agent and each Lender, within 30 days after demand therefor, for the full amount of any Indemnified Taxes or Other Taxes (including Indemnified Taxes or Other Taxes imposed or asserted on or attributable to amounts payable under this Section) paid by the Administrative Agent or such Lender and any penalties, interest and reasonable expenses arising therefrom or with respect thereto, whether or not such Indemnified Taxes or Other Taxes were correctly or legally imposed or asserted by the relevant Governmental Authority. A certificate as to the amount of such payment or liability delivered to the Borrower by a Lender (with a copy to the Administrative Agent), or by the Administrative Agent on its own behalf or on behalf of a Lender, shall be presumed correct absent manifest error. However, neither the Administrative Agent nor any Lender shall be entitled to receive any payment with respect to Indemnified or Other Taxes that are incurred or accrued more that 270 days prior to the date the Administrative Agent or such Lender gives notice and demand thereof to the Borrower.

          (d) Evidence of Payments. As soon as reasonably practicable after any payment of Indemnified Taxes or Other Taxes by the Borrower to a Governmental Authority, the Borrower shall deliver to the Administrative Agent the original or a certified copy of a receipt issued by such Governmental Authority evidencing such payment, a copy of the return reporting such payment or other evidence of such payment reasonably satisfactory to the Administrative Agent.

          (e) Status of Lenders. Any Foreign Lender that is entitled to an exemption from or reduction of withholding tax under the law of the jurisdiction in which the Borrower is resident for tax purposes, or any treaty to which such jurisdiction is a party, with respect to payments hereunder or under any other Loan Document shall deliver to the Borrower (with a

copy to the Administrative Agent), at the time or times prescribed by applicable law or reasonably requested by the Borrower or the Administrative Agent, such properly completed and executed documentation prescribed by applicable law as will permit such payments to be made without withholding or at a reduced rate of withholding. In addition, any Lender, at the time or times prescribed by law or reasonably requested by the Borrower or the Administrative Agent, shall deliver such other documentation prescribed by applicable law or reasonably requested by the Borrower or the Administrative Agent as will enable the Borrower or the Administrative Agent to determine whether or not such Lender is subject to backup withholding or information reporting requirements. Each Lender shall promptly notify the Borrower and the Administrative Agent of any change in circumstances which would modify or render invalid any claimed exemption or reduction.

     Without limiting the generality of the foregoing, any Foreign Lender shall deliver to the Borrower and the Administrative Agent (in such number of copies as shall be requested by the recipient) on or prior to the date on which such Foreign Lender becomes a Lender under this Agreement (and from time to time thereafter upon the request of the Borrower or the Administrative Agent or as required by applicable law, but only if such Foreign Lender is legally entitled to do so), whichever of the following is applicable:

          (i) duly completed copies of IRS Form W-8BEN claiming the benefits of the portfolio interest exemption pursuant to subsection (iii) below or eligibility for benefits of an income tax treaty to which the United States is a party,

          (ii) duly completed copies of IRS Form W-8ECI,

          (iii) in the case of a Foreign Lender claiming the benefits of the exemption for portfolio interest under section 881(c) of the Code, (x) a certificate to the effect that such Foreign Lender is not (A) a “bank” within the meaning of section 881(c)(3)(A) of the Code, (B) a “10 percent shareholder” of the Borrower within the meaning of section 881(c)(3)(B) of the Code, or (C) a “controlled foreign corporation” described in section 881(c)(3)(C) of the Code or (D) that such payments are not effectively connected with such Foreign Lender’s conduct of a trade or business in the United States, and (y) duly completed copies of IRS Form W-8BEN, or

          (iv) any other form prescribed by applicable law as a basis for claiming exemption from or a reduction in United States Federal withholding tax duly completed together with such supplementary documentation as may be prescribed by applicable law to permit the Borrower to determine the withholding or deduction required to be made.

          (f) Treatment of Certain Refunds. If the Administrative Agent or any Lender determines in good faith that it has received a refund of any Taxes or Other Taxes as to which it has been indemnified by the Borrower or with respect to which the Borrower has paid additional amounts pursuant to this Section, it shall pay to the Borrower an amount equal to such refund (but only to the extent of indemnity payments made, or additional amounts paid, by the Borrower under this Section with respect to the Taxes or Other Taxes giving rise to such refund), net of all out-of-pocket expenses of the Administrative Agent or such Lender, as the case may be, and without interest (other than any interest paid by the relevant Governmental Authority with

respect to such refund), provided that the Borrower, upon the request of the Administrative Agent or such Lender, agrees to repay the amount paid over to the Borrower (plus any penalties, interest or other charges imposed by the relevant Governmental Authority) to the Administrative Agent or such Lender in the event the Administrative Agent or such Lender is required to repay such refund to such Governmental Authority, in which case the Administrative Agent or such Lender shall provide evidence that such refund is due to such Governmental Authority. This subsection shall not be construed to require the Administrative Agent or any Lender to make available its tax returns (or any other information relating to its taxes that it deems confidential) to the Borrower or any other Person.

     3.02 Illegality. If any Lender determines that any Law has made it unlawful, or that any Governmental Authority has asserted that it is unlawful, for any Lender or its applicable Lending Office to make, maintain or fund Eurodollar Rate Loans, or to determine or charge interest rates based upon the Eurodollar, or any Governmental Authority has imposed material restrictions on the authority of such Lender to purchase or sell, or to take deposits of, Dollars in the London interbank market, then, on notice thereof by such Lender to the Borrower through the Administrative Agent, any obligation of such Lender to make or continue Eurodollar Rate Loans or to convert Base Rate Loans to Eurodollar Rate Loans shall be suspended until such Lender notifies the Administrative Agent and the Borrower that the circumstances giving rise to such determination no longer exist. Upon receipt of such notice, the Borrower shall, upon demand from such Lender (with a copy to the Administrative Agent), prepay or, if applicable, convert all Eurodollar Rate Loans of such Lender to Base Rate Loans, either on the last day of the Interest Period therefor, if such Lender may lawfully continue to maintain such Eurodollar Rate Loans to such day, or immediately, if such Lender may not lawfully continue to maintain such Eurodollar Rate Loans. Upon any such prepayment or conversion, the Borrower shall also pay accrued interest on the amount so prepaid or converted.

     3.03 Inability to Determine Rates. If the Required Lenders determine that for any reason in connection with any request for a Eurodollar Rate Loan or a conversion to or continuation thereof that (a) Dollar deposits are not being offered to banks in the London interbank eurodollar market for the applicable amount and Interest Period of such Eurodollar Rate Loan, (b) adequate and reasonable means do not exist for determining the Eurodollar for any requested Interest Period with respect to a proposed Eurodollar Rate Loan, or (c) the Eurodollar for any requested Interest Period with respect to a proposed Eurodollar Rate Loan does not adequately and fairly reflect the cost to such Lenders of funding such Loan, the Administrative Agent will promptly so notify the Borrower and each Lender. Thereafter, the obligation of the Lenders to make or maintain Eurodollar Rate Loans shall be suspended until the Administrative Agent (upon the instruction of the Required Lenders) revokes such notice. Upon receipt of such notice, the Borrower may revoke any pending request for a Borrowing of, conversion to or continuation of Eurodollar Rate Loans or, failing that, will be deemed to have converted such request into a request for a Borrowing of Base Rate Loans in the amount specified therein.

     3.04 Increased Costs; Reserves on Eurodollar Rate Loans.

          (a) Increased Costs Generally. If any Change in Law shall:

          (i) impose, modify or deem applicable any reserve, special deposit, compulsory loan, insurance charge or similar requirement against assets of, deposits with or for the account of, or credit extended or participated in by, any Lender (except any reserve requirement reflected in the Eurodollar);

          (ii) subject any Lender to any tax of any kind whatsoever with respect to this Agreement or any Eurodollar Rate Loan made by it, or change the basis of taxation of payments to such Lender in respect thereof (except for Indemnified Taxes or Other Taxes covered by Section 3.01 and the imposition of, or any change in the rate of, any Excluded Tax payable by such Lender); or

          (iii) impose on any Lender or the London interbank market any other condition, cost or expense affecting this Agreement or Eurodollar Rate Loans made by such Lender;

and the result of any of the foregoing shall be to increase the cost to such Lender of making or maintaining any Eurodollar Rate Loan (or of maintaining its obligation to make any such Loan), or to increase the cost to such Lender, or to reduce the amount of any sum received or receivable by such Lender (whether of principal, interest or any other amount) then, upon request of such Lender, the Borrower will pay to such Lender such additional amount or amounts as will compensate such Lender for such additional costs incurred or reduction suffered.

          (b) Capital Requirements. If any Lender determines that any Change in Law affecting such Lender or any Lending Office of such Lender or such Lender’s holding company, if any, regarding capital requirements has or would have the effect of reducing the rate of return on such Lender’s capital or on the capital of such Lender’s holding company, if any, as a consequence of this Agreement, the Commitments of such Lender or the Loans made by such Lender, to a level below that which such Lender or such Lender’s holding company could have achieved but for such Change in Law (taking into consideration such Lender’s policies and the policies of such Lender’s holding company with respect to capital adequacy), then from time to time the Borrower will pay to such Lender such additional amount or amounts as will compensate such Lender or such Lender’s holding company for any such reduction suffered.

          (c) Certificates for Reimbursement. A certificate of a Lender setting forth the amount or amounts necessary to compensate such Lender or its holding company, as the case may be, as specified in subsection (a) or (b) of this Section and delivered to the Borrower shall be presumed correct absent manifest error. The Borrower shall pay such Lender the amount shown as due on any such certificate within 10 days after receipt thereof.

          (d) Delay in Requests. Failure or delay on the part of any Lender to demand compensation pursuant to the foregoing provisions of this Section shall not constitute a waiver of such Lender’s right to demand such compensation, provided that the Borrower shall not be required to compensate a Lender pursuant to the foregoing provisions of this Section for any increased costs incurred or reductions suffered more than six months prior to the date that such Lender notifies the Borrower of the Change in Law giving rise to such increased costs or reductions and of such Lender’s intention to claim compensation therefor (except that, if the

Change in Law giving rise to such increased costs or reductions is retroactive, then the six-month period referred to above shall be extended to include the period of retroactive effect thereof).

     3.05 Compensation for Losses. Upon demand of any Lender (with a copy to the Administrative Agent) from time to time, the Borrower shall promptly compensate such Lender for and hold such Lender harmless from any loss, cost or expense incurred by it as a result of:

          (a) any continuation, conversion, payment or prepayment of any Loan other than a Base Rate Loan on a day other than the last day of the Interest Period for such Loan (whether voluntary, mandatory, automatic, by reason of acceleration, or otherwise); or

          (b) any failure by the Borrower (for a reason other than the failure of such Lender to make a Loan) to prepay, borrow, continue or convert any Loan other than a Base Rate Loan on the date or in the amount notified by the Borrower; or

          (c) any assignment of a Eurodollar Rate Loan on a day other than the last day of the Interest Period therefor as a result of a request by the Borrower pursuant to Section 10.13;

including any loss of anticipated profits and any loss or expense arising from the liquidation or reemployment of funds obtained by it to maintain such Loan or from fees payable to terminate the deposits from which such funds were obtained. The Borrower shall also pay any customary administrative fees charged by such Lender in connection with the foregoing.

     For purposes of calculating amounts payable by the Borrower to the Lenders under this Section 3.05, each Lender shall be deemed to have funded each Eurodollar Rate Loan made by it at the Eurodollar for such Loan by a matching deposit or other borrowing in the London interbank eurodollar market for a comparable amount and for a comparable period, whether or not such Eurodollar Rate Loan was in fact so funded.

     3.06 Mitigation Obligations. (a) If any Lender requests compensation under Section 3.04, or the Borrower is required to pay any additional amount to any Lender or any Governmental Authority for the account of any Lender pursuant to Section 3.01, or if any Lender gives a notice pursuant to Section 3.02, then such Lender shall use reasonable efforts to designate a different Lending Office for funding or booking its Loans hereunder or to assign its rights and obligations hereunder to another of its offices, branches or affiliates, if, in the judgment of such Lender, such designation or assignment (i) would eliminate or reduce amounts payable pursuant to Section 3.01 or 3.04, as the case may be, in the future, or eliminate the need for the notice pursuant to Section 3.02, as applicable, and (ii) in each case, would not subject such Lender to any unreimbursed cost or expense and would not otherwise be disadvantageous to such Lender. The Borrower hereby agrees to pay all reasonable costs and expenses incurred by any Lender in connection with any such designation or assignment.

          (b) If any Lender requests compensation under Section 3.04, or if the Borrower is required to pay any additional amount to any Lender or any Governmental Authority for the account of any Lender pursuant to Section 3.01, the Borrower may replace such Lender in accordance with Section 10.13.

     3.07 Survival. All of the Borrower’s obligations under this Article III shall survive termination of the Aggregate Commitments and repayment of all other Obligations hereunder.

ARTICLE IV

CONDITIONS PRECEDENT TO CREDIT EXTENSIONS

     4.01 Conditions of Initial Credit Extension. The obligation of each Lender to make its initial Credit Extension hereunder is subject to satisfaction of the following conditions precedent:

          (a) The Administrative Agent’s receipt of the following, each of which shall be originals or telecopies (followed promptly by originals) unless otherwise specified, each properly executed by a Responsible Officer of the signing Loan Party, each dated the Closing Date (or, in the case of certificates of governmental officials, a recent date before the Closing Date) and each in form and substance satisfactory to the Administrative Agent and each of the Lenders:

          (i) executed counterparts of this Agreement and the Guaranty;

          (ii) a Note executed by the Borrower in favor of each Lender requesting a Note;

          (iii) such certificates of resolutions or other action, incumbency certificates and/or other certificates of a secretary or assistant secretary or similar officer of each Loan Party as the Administrative Agent may require evidencing the identity, authority and capacity of each Responsible Officer thereof authorized to act as a Responsible Officer in connection with this Agreement and the other Loan Documents to which such Loan Party is a party;

          (iv) such documents and certifications as the Administrative Agent may reasonably require to evidence that each Loan Party is duly organized or formed, and that each Loan Party is validly existing, in good standing and qualified to engage in business in its jurisdiction of incorporation or formation;

          (v) a favorable opinion of Fulbright and Jaworski, L.L.P., counsel to the Loan Parties, addressed to the Administrative Agent and each Lender, as to the matters set forth in Exhibit F;

          (vi) a certificate of a Responsible Officer of the Borrower either (A) attaching copies of all consents, licenses and approvals required in connection with the execution, delivery and performance by the Borrower and the validity against the Borrower of the Loan Documents to which it is a party, and such consents, licenses and approvals shall be in full force and effect, or (B) stating that no such consents, licenses or approvals are so required;

          (vii) a certificate signed by a Responsible Officer of the Borrower certifying (A) that the representations and warranties of the Loan Parties set forth in the

Loan Documents are true and correct in all material respects (except to the extent that such representation and warranty is qualified by materiality or is limited to a specific date), and (B) no Default or Event of Default has occurred and is continuing or would result from the initial Borrowing contemplated hereunder or the application of proceeds therefrom;

          (viii) a certificate signed by the chief financial officer of the Borrower certifying that each of the Loan Parties, in each case after giving effect to the initial Borrowing contemplated hereunder, the Acquisition and the other transactions contemplated hereby, is or are Solvent;

          (ix) a certificate signed by the chief financial officer of the Borrower certifying that immediately after giving pro forma effect to the initial Borrowings and the Acquisition, the Borrower shall be in compliance with Section 7.10;

          (x) a certificate signed by a Responsible Officer of the Borrower certifying that, to the Borrower’s knowledge as certified to it by the Sellers, no “Material Adverse Effect” (as such term is defined in the Acquisition Agreement) has occurred and is continuing since March 31, 2010; and

          (xi) such other assurances, certificates, documents, consents or opinions as the Administrative Agent or the Required Lenders reasonably may require.

          (b) There shall not have occurred (i) any bankruptcy of any Loan Party, or (ii) any material pending or threatened litigation or other proceeding by or against a Loan Party that has a reasonable likelihood of being adversely determined, and if adversely determined, would reasonably be expected to materially and adversely affect the ability of the Loan Parties as a whole to repay when due the Loans contemplated herein.

          (c) The Administrative Agent shall have received (i) copies of all Acquisition Documents, together with all amendments, supplements, waivers or other modifications thereto, in each case certified by a Responsible Officer of the Borrower as true, correct and complete and (ii) evidence of all consents and approvals required pursuant to the terms of the Acquisition Documents, including the consent or approval of the board of directors or other governing body of the Sellers. The Acquisition will have been consummated in accordance in all material respects with the terms and conditions of the Acquisition Documents without any waiver, modification or consent thereunder that is materially adverse to the Lenders unless approved by the Lenders.

          (d) Any fees required to be paid on or before the Closing Date shall have been paid.

          (e) Unless waived by the Administrative Agent, the Borrower shall have paid all fees, charges and disbursements of counsel to the Administrative Agent to the extent invoiced prior to or on the Closing Date, plus such additional amounts of such fees, charges and disbursements as shall constitute its reasonable estimate of such fees, charges and disbursements incurred or to be incurred by it through the closing proceedings (provided, that such estimate

shall not thereafter preclude a final settling of accounts between the Borrower and the Administrative Agent).

          (f) The Administrative Agent shall have received a Request for Credit Extension in accordance with the requirements hereof.

          (g) No statute, rule, regulation or other legal requirement shall have been promulgated or enacted and be in effect that on a permanent basis restrains, enjoins, or prohibits the Lenders from making such Credit Extension.

          (h) The Administrative Agent and each Lender shall have received all documentation and other information that the Administrative Agent and each such Lender shall have reasonably requested in order to comply with its respective obligations under applicable “know your customer” and anti-money laundering rules and regulations, including the Patriot Act.

ARTICLE V

REPRESENTATIONS AND WARRANTIES

     The Borrower represents and warrants to the Administrative Agent and the Lenders that:

     5.01 Existence, Qualification and Power; Compliance with Laws. Each Loan Party (a) is duly organized or formed, validly existing and in good standing under the Laws of the jurisdiction of its incorporation or organization, (b) has all requisite power and authority and all requisite governmental licenses, authorizations, consents and approvals to (i) own its assets and carry on its business and (ii) execute, deliver and perform its obligations under the Loan Documents to which it is a party, (c) is duly qualified and is licensed and in good standing under the Laws of each jurisdiction where its ownership, lease or operation of properties or the conduct of its business requires such qualification or license, and (d) is in compliance with all Laws; except in each case referred to in clause (b)(i), (c) or (d), to the extent that failure to do so could not reasonably be expected to have a Material Adverse Effect.

     5.02 Authorization; No Contravention. The execution, delivery and performance by each Loan Party of each Loan Document to which such Person is party, have been duly authorized by all necessary corporate or other organizational action, and do not and will not (a) violate the terms of any of such Person’s Organization Documents; (b) violate or result in any breach of, or the creation of any Lien under, or require any payment to be made under (i) any Contractual Obligation to which such Person is a party or affecting such Person or the properties of such Person or any of its Subsidiaries or (ii) any order, injunction, writ or decree of any Governmental Authority or any arbitral award to which such Person or its property is subject; or (c) violate any Law. Each Loan Party is in compliance with all Contractual Obligations referred to in clause (b)(i), except to the extent that failure to do so could not reasonably be expected to have a Material Adverse Effect.

     5.03 Governmental Authorization; Other Consents. No approval, consent, exemption, authorization, or other action by, or notice to, or filing with, any Governmental Authority or any other Person is necessary or required in connection with the execution, delivery or performance by, or enforcement against, any Loan Party of this Agreement or any other Loan Document.

     5.04 Binding Effect. This Agreement has been, and each other Loan Document, when delivered hereunder, will have been, duly executed and delivered by each Loan Party that is party thereto. This Agreement constitutes, and each other Loan Document when so delivered will constitute, a legal, valid and binding obligation of such Loan Party, enforceable against each Loan Party that is party thereto in accordance with its terms, except as may be limited by bankruptcy, insolvency, moratorium, fraudulent transfer and fraudulent conveyance laws, and other similar laws and provisions, and general principles of equity.

     5.05 Financial Statements. The Audited Financial Statements (i) were prepared in accordance with GAAP consistently applied throughout the period covered thereby, except as otherwise expressly noted therein; (ii) fairly present the financial condition of the Borrower and its Subsidiaries as of the date thereof and their results of operations for the period covered thereby in accordance with GAAP consistently applied throughout the period covered thereby, except as otherwise expressly noted therein; and (iii) show all material indebtedness and other liabilities, direct or contingent, of the Borrower and its Subsidiaries as of the date thereof, including liabilities for taxes, material commitments and Indebtedness.

     5.06 Litigation. There are no actions, suits, proceedings, claims or disputes pending or, to the knowledge of the Borrower after due and diligent investigation, threatened or contemplated, at law, in equity, in arbitration or before any Governmental Authority, by or against the Borrower or any of its Subsidiaries or against any of their properties or revenues that (a) purport to affect or pertain to this Agreement or any other Loan Document, or any of the transactions contemplated hereby, or (b) as to which there is a reasonable possibility of an adverse determination, and that, if determined adversely, could reasonably be expected, either individually or in the aggregate, to have a Material Adverse Effect.

     5.07 No Default. No Default has occurred and is continuing or would result from the consummation of the transactions contemplated by this Agreement or any other Loan Document.

     5.08 Ownership of Property; Liens. Each of the Borrower and each Subsidiary has good record and indefeasible title in fee simple to, or valid leasehold interests in, all real property necessary or used in the ordinary conduct of its business, except for such defects in title as could not, individually or in the aggregate, reasonably be expected to have a Material Adverse Effect. The property of the Borrower and its Subsidiaries is subject to no Liens, other than Liens permitted by Section 7.01.

     5.09 Environmental Compliance. The Borrower and its Subsidiaries conduct in the ordinary course of business a review of the effect of existing Environmental Laws and claims alleging potential liability or responsibility for violation of any Environmental Law on their respective businesses, operations and properties, and as a result thereof, the Borrower has

reasonably concluded that such Environmental Laws and claims could not, individually or in the aggregate, reasonably be expected to have a Material Adverse Effect.

     5.10 Insurance. The properties of the Borrower and its Subsidiaries are insured with financially sound and reputable insurance companies not Affiliates of the Borrower, in such amounts, with such deductibles and covering such risks as are customarily carried by companies engaged in similar businesses and owning similar properties in localities where the Borrower or the applicable Subsidiary operates.

     5.11 Taxes. The Borrower and its Subsidiaries have filed all Federal, state and other material tax returns and reports required to be filed, and have paid all Federal, state and other material taxes, assessments, fees and other governmental charges levied or imposed upon them or their properties, income or assets otherwise due and payable, except those which are being contested in good faith by appropriate proceedings diligently conducted and for which adequate reserves have been provided in accordance with GAAP. Neither the Borrower nor any of its Subsidiaries have received any written notice from any Governmental Authority proposing a tax assessment against the Borrower or any Subsidiary that would, if made, have a Material Adverse Effect. Neither any Loan Party nor any Subsidiary thereof is party, with any Person other than the Borrower or a Subsidiary of the Borrower, to any tax sharing agreement; provided that the allocation of taxes in connection with a business acquisition agreement does not constitute a tax sharing agreement.

     5.12 ERISA Compliance.

          (a) Except as could not reasonably be expected to have a Material Adverse Effect, each Plan is in compliance in all material respects with the applicable provisions of ERISA, the Code and other Federal or state Laws. Each Plan that is intended to qualify under Section 401(a) of the Code has received a favorable determination letter or opinion letter from the IRS or an application for such a letter is currently being processed by the IRS with respect thereto and, to the best knowledge of the Borrower, no event or circumstance has occurred or exists which would prevent, or cause the loss of, such qualification. The Borrower and each ERISA Affiliate have made all material amounts of required contributions to each Plan subject to Section 412 of the Code, and no application for a funding waiver or an extension of any amortization period pursuant to Section 412 of the Code has been made with respect to any Plan.

          (b) There are no pending or, to the best knowledge of the Borrower, threatened claims, actions or lawsuits, or action by any Governmental Authority, with respect to any Plan that could reasonably be expected to have a Material Adverse Effect. There has been no prohibited transaction or violation of the fiduciary responsibility rules with respect to any Plan that has resulted or could reasonably be expected to result in a Material Adverse Effect.

          (c) (i) No ERISA Event has occurred or is reasonably expected to occur that, when taken together with each other ERISA Event that has occurred or is reasonably expected to occur, could reasonably be expected to result in a Material Adverse Effect; (ii) the Unfunded Pension Liability of all Pension Plans does not exceed the Threshold Amount; and (iii) neither the Borrower nor any ERISA Affiliate has engaged in a transaction that could be subject to Sections 4069 or 4212(c) of ERISA.

     5.13 Subsidiaries; Equity Interests. As of the Closing Date, the Borrower has no Subsidiaries other than those specifically disclosed in Part (a) of Schedule 5.13, and all of the outstanding Equity Interests in such Subsidiaries have been validly issued, are fully paid and nonassessable and are owned by a Loan Party in the amounts specified on Part (a) of Schedule 5.13 free and clear of all Liens. As of the Closing Date, the Borrower has no equity investments in any other corporation or entity other than those specifically disclosed in Part (b) of Schedule 5.13.

     5.14 Margin Regulations; Investment Company Act.

          (a) The Borrower is not engaged and will not engage, principally or as one of its important activities, in the business of purchasing or carrying margin stock (within the meaning of Regulation U issued by the FRB), or extending credit for the purpose of purchasing or carrying margin stock. Following the application of the proceeds of each Borrowing, not more than 25% of the value of the assets (either of the Borrower only or of the Borrower and its Subsidiaries on a consolidated basis) subject to the provisions of Section 7.01 or Section 7.05 or subject to any restriction contained in any agreement or instrument between the Borrower and any Lender or any Affiliate of any Lender relating to Indebtedness and within the scope of Section 8.01(e) will be margin stock.

          (b) None of the Borrower, any Person Controlling the Borrower, or any Subsidiary is or is required to be registered as an “investment company” under the Investment Company Act of 1940.

     5.15 Disclosure. The Borrower has disclosed to the Administrative Agent and the Lenders, or has stated in filings with the Securities and Exchange Commission of the type described in Section 6.02(d), all agreements, instruments and corporate or other restrictions to which it or any of its Subsidiaries is subject, and all other matters known to it, that, individually or in the aggregate, could reasonably be expected to result in a Material Adverse Effect. No report, financial statement, certificate or other information furnished (whether in writing or orally) by or on behalf of any Loan Party to the Administrative Agent or any Lender in connection with the transactions contemplated hereby and the negotiation of this Agreement or delivered hereunder or under any other Loan Document (in each case, as modified or supplemented by, or read in conjunction with, other information so furnished) contains any material misstatement of fact or, when read together with filings with the Securities and Exchange Commission of the type described in Section 6.02(d), omits to state any material fact necessary to make the statements therein, in the light of the circumstances under which they were made, not misleading in any material respect; provided that, with respect to projected financial information, the Borrower represents only that such information was prepared in good faith based upon assumptions believed to be reasonable at the time. The Borrower has given all notices required to be delivered pursuant to Section 6.03.

     5.16 Compliance with Laws. Each of the Borrower and each Subsidiary is in compliance in all material respects with the requirements of all Laws and all orders, writs, injunctions and decrees applicable to it or to its properties, except in such instances in which (a) such requirement of Law or order, writ, injunction or decree is being contested in good faith by appropriate proceedings diligently conducted or (b) the failure to comply therewith, either

individually or in the aggregate, could not reasonably be expected to have a Material Adverse Effect.

ARTICLE VI

AFFIRMATIVE COVENANTS

     So long as any Lender shall have any Commitment hereunder, any Loan or other Obligation hereunder shall remain unpaid or unsatisfied, the Borrower shall, and shall (except in the case of the covenants set forth in Sections 6.01, 6.02, and 6.03) cause each Subsidiary to:

     6.01 Financial Statements. Deliver to the Administrative Agent and each Lender, in form and detail satisfactory to the Administrative Agent and the Required Lenders:

          (a) as soon as available, but in any event within 90 days after the end of each fiscal year of the Borrower, its Annual Report, the Form 10-K, or its equivalent, of the Borrower, for such fiscal year that includes a consolidated balance sheet of the Borrower and its Subsidiaries as at the end of such fiscal year, and the related consolidated statements of income or operations, shareholders’ equity and cash flows for such fiscal year, setting forth in each case in comparative form the figures for the previous fiscal year, all in reasonable detail and prepared in accordance with GAAP, audited and accompanied by a report and opinion of an independent certified public accountant of nationally recognized standing reasonably acceptable to the Required Lenders, which report and opinion shall be prepared in accordance with generally accepted auditing standards and shall not be subject to any “going concern” or like qualification or exception or any qualification or exception as to the scope of such audit; and

          (b) as soon as available, but in any event within 45 days after the end of each of the first three fiscal quarters of each fiscal year of the Borrower, its Quarterly Report on Form 10-Q, or its equivalent, of the Borrower that includes a consolidated balance sheet of the Borrower and its Subsidiaries as at the end of such fiscal quarter, and the related consolidated statements of income or operations, shareholders’ equity and cash flows for such fiscal quarter and for the portion of the Borrower’s fiscal year then ended, setting forth in each case in comparative form the figures for the corresponding fiscal quarter of the previous fiscal year and the corresponding portion of the previous fiscal year, all in reasonable detail, and that includes a certification of a Responsible Officer of the Borrower in accordance with applicable law and regulations, certifying that the foregoing fairly presents the financial condition, results of operations, shareholders’ equity and cash flows of the Borrower and its Subsidiaries in accordance with GAAP, subject only to normal year-end audit adjustments and the absence of footnotes (provided, however, that the requirement for certification contained in this paragraph (b) shall be deemed satisfied by a certification of a Responsible Officer made in conjunction with a Form 10-Q as required by the Sarbanes-Oxley Act of 2002 as in effect on the Closing Date (or as subsequently amended if such law as amended requires a certification that is more comprehensive than, or substantially similar to, the certification required by this paragraph (b)).

     As to any information contained in materials furnished pursuant to Section 6.02, the Borrower shall not be separately required to furnish such information under clause (a) or (b) above, but the foregoing shall not be in derogation of the obligation of the Borrower to furnish

the information and materials described in clauses (a) and (b) above at the times specified therein.

     6.02 Certificates; Other Information. Deliver to the Administrative Agent and each Lender, in form and detail satisfactory to the Administrative Agent and the Required Lenders:

          (a) concurrently with the delivery of the financial statements referred to in Section 6.01(a), a certificate of its independent certified public accountants certifying such financial statements and stating that in making the examination necessary therefor no knowledge was obtained of any Default or, if any such Default shall exist, stating the nature and status of such event;

          (b) concurrently with the delivery of the financial statements referred to in Sections 6.01(a) and (b), a duly completed Compliance Certificate signed by a Responsible Officer of the Borrower;

          (c) promptly after any request by the Administrative Agent or any Lender, copies of any detailed audit reports, management letters or recommendations submitted to the board of directors (or the audit committee of the board of directors) of the Borrower by independent accountants in connection with the accounts or books of the Borrower or any Subsidiary, or any audit of any of them;

          (d) promptly after the same are available the following (provided, however, that the requirement to deliver the following may be satisfied by giving notice as provided in the last paragraph of this Section 6.02): (i) each report on Form 8-K (other than earnings reports) and effective registration statement filed with the Securities and Exchange Commission, and (ii) each annual report, proxy, financial statement or other report sent to the stockholders of the Borrower, to the extent that such items are not otherwise required to be delivered to the Administrative Agent pursuant hereto;

          (e) promptly after the furnishing thereof, copies of any statement or report other than those related to ministerial matters furnished to any holder of debt securities of any Loan Party or any Subsidiary thereof pursuant to the terms of any indenture, loan or credit or similar agreement and not otherwise required to be furnished to the Lenders pursuant to Section 6.01 or any other clause of this Section 6.02;

          (f) promptly, and in any event within five Business Days after receipt thereof by any Loan Party or any Subsidiary thereof, copies of each notice or other correspondence received from the SEC (or comparable agency in any applicable non-U.S. jurisdiction) concerning any investigation or possible investigation by such agency regarding financial or other operational results of any Loan Party or any Subsidiary thereof;

          (g) the items required to be delivered pursuant to Schedule 4.01 within the time periods therein specified; and

          (h) promptly, such additional information regarding the business, financial or corporate affairs of the Borrower or any Subsidiary, or compliance with the terms of the Loan

Documents, as the Administrative Agent or any Lender may from time to time reasonably request.

     The Borrower shall be deemed to have satisfied the requirement to deliver documents pursuant to Section 6.01(a) or (b) or Section 6.02(d) if such documents shall have been timely made available on “EDGAR” and/or on the Borrower’s home page on the world wide web (as of the date of this Agreement located at www.patenergy.com). Notwithstanding anything contained herein, in every instance the Borrower shall be required to provide to the Administrative Agent a copy by electronic mail of the Compliance Certificates required by Section 6.02(b) and the financial statements referred to in Section 6.01(a) and (b). Except for such Compliance Certificates, the Administrative Agent shall have no obligation to request the delivery or to maintain copies of the documents referred to above, and in any event shall have no responsibility to monitor compliance by the Borrower with any such request for delivery, and each Lender shall be solely responsible for requesting delivery to it or maintaining its copies of such documents.

     6.03 Notices. Promptly notify the Administrative Agent and each Lender:

          (a) of the occurrence of any Default;

          (b) of any matter that has resulted or could reasonably be expected to result in a Material Adverse Effect, including (i) breach or non-performance of, or any default under, a Contractual Obligation of the Borrower or any Subsidiary; (ii) any dispute, litigation, investigation, proceeding or suspension between the Borrower or any Subsidiary and any Governmental Authority; or (iii) the commencement of, or any material development in, any litigation or proceeding affecting the Borrower or any Subsidiary, including pursuant to any applicable Environmental Laws;

          (c) of the occurrence of any ERISA Event; and

          (d) of any material change in accounting policies or financial reporting practices by the Borrower or any Subsidiary.

     Each notice pursuant to this Section shall be accompanied by a statement of a Responsible Officer of the Borrower setting forth details of the occurrence referred to therein and stating what action the Borrower has taken and proposes to take with respect thereto. Each notice pursuant to Section 6.03(a) shall describe with particularity any and all provisions of this Agreement and any other Loan Document that have been breached.

     6.04 Payment of Obligations. Pay and discharge as the same shall become due and payable, all its obligations and liabilities, including (a) all tax liabilities, assessments and governmental charges or levies upon it or its properties or assets, unless the same are being contested in good faith by appropriate proceedings diligently conducted and adequate reserves in accordance with GAAP are being maintained by the Borrower or such Subsidiary; (b) all lawful claims which, if unpaid, would by law become a Lien upon its property, except those that are being contested in good faith by appropriate proceedings and for which adequate reserves have been established in accordance with GAAP; and (c) all Indebtedness, as and when due and payable, but subject to any subordination provisions contained in any instrument or agreement evidencing such Indebtedness.

     6.05 Preservation of Existence, Etc. (a) Preserve, renew and maintain in full force and effect its legal existence and good standing under the Laws of the jurisdiction of its organization except in a transaction permitted by Section 7.04; (b) take all reasonable action to maintain all rights, privileges, permits, licenses and franchises necessary or desirable in the normal conduct of its business, except to the extent that failure to do so could not reasonably be expected to have a Material Adverse Effect; and (c) preserve or renew all of its registered patents, trademarks, trade names and service marks, the failure to preserve any of which could reasonably be expected to have a Material Adverse Effect.

     6.06 Maintenance of Properties. (a) Maintain, preserve and protect all of its material properties and equipment necessary in the operation of its business in accordance with industry practices; (b) make all necessary repairs thereto and renewals and replacements thereof except where the failure to do so could not reasonably be expected to have a Material Adverse Effect; and (c) use the standard of care typical in the industry in the operation and maintenance of its facilities.

     6.07 Maintenance of Insurance. Maintain with financially sound and reputable insurance companies not Affiliates of the Borrower, insurance with respect to its properties and business against loss or damage of the kinds customarily insured against by Persons engaged in the same or similar business, of such types and in such amounts as are customarily carried under similar circumstances by such other Person.

     6.08 Compliance with Laws. Comply in all material respects with the requirements of all Laws and all orders, writs, injunctions and decrees applicable to it or to its business or property, except in such instances in which (a) such requirement of Law or order, writ, injunction or decree is being contested in good faith by appropriate proceedings diligently conducted; or (b) the failure to comply therewith could not reasonably be expected to have a Material Adverse Effect.

     6.09 Books and Records. Maintain proper books of record and account, in which full, true and correct entries in conformity with GAAP consistently applied shall be made of all financial transactions and matters involving the assets and business of the Borrower or such Subsidiary, as the case may be.

     6.10 Inspection Rights. Permit representatives and independent contractors of the Administrative Agent and each Lender to visit and inspect any of its properties, to examine its corporate, financial and operating records, and make copies thereof or abstracts therefrom, and to discuss its affairs, finances and accounts with its directors, officers, and independent public accountants, all at such reasonable times during normal business hours and as often as may be reasonably desired, upon reasonable advance notice to the Borrower; provided, however, that when an Event of Default exists the Administrative Agent or any Lender (or any of their respective representatives or independent contractors) may do any of the foregoing at the expense of the Borrower at any time during normal business hours and without advance notice.

     6.11 Use of Proceeds. Use the proceeds of the Credit Extensions to finance a portion of the purchase price for the Acquisition and/or to pay a portion of the fees, commissions and expenses associated with the Acquisition.

     6.12 Additional Guarantors. Notify the Administrative Agent within 10 days after the date that any Person becomes a Domestic Subsidiary other than an Immaterial Subsidiary, and within 10 days after the date that any Person becomes a Domestic Subsidiary other than an Immaterial Subsidiary, cause such Person to (a) become a Guarantor by executing and delivering to the Administrative Agent a counterpart of the Guaranty or such other document as the Administrative Agent shall deem appropriate for such purpose, and (b) deliver to the Administrative Agent documents of the types referred to in clauses (iii) and (iv) of Section 4.01(a) and favorable opinions of counsel to such Person (which shall cover, among other things, the legality, validity, binding effect and enforceability of the documentation referred to in clause (a)), all in form, content and scope reasonably satisfactory to the Administrative Agent.

ARTICLE VII

NEGATIVE COVENANTS

     So long as any Lender shall have any Commitment hereunder, any Loan or other Obligation hereunder shall remain unpaid or unsatisfied, the Borrower shall not, nor shall it permit any Subsidiary to, directly or indirectly:

     7.01 Liens. Create, incur, assume or suffer to exist any Lien upon any of its property, assets or revenues, whether now owned or hereafter acquired, other than the following:

          (a) Liens pursuant to any Loan Document;

          (b) Liens existing on the date hereof and listed on Schedule 7.01 and any renewals or extensions thereof, provided that (i) the property covered thereby is not changed, (ii) the amount secured or benefited thereby is not increased, and (iii) the direct or any contingent obligor with respect thereto is not changed;

          (c) Liens for taxes or unpaid utilities not yet due or which are being contested in good faith and by appropriate proceedings diligently conducted, if adequate reserves with respect thereto are maintained on the books of the applicable Person in accordance with GAAP;

          (d) carriers’, warehousemen’s, mechanics’, materialmen’s, repairmen’s or other like Liens arising in the ordinary course of business which are not overdue for a period of more than 60 days or which are being contested in good faith and by appropriate proceedings diligently conducted, if adequate reserves with respect thereto are maintained on the books of the applicable Person;

          (e) pledges or deposits in the ordinary course of business in connection with workers’ compensation, unemployment insurance and other social security legislation, other than any Lien imposed by ERISA;

          (f) deposits to secure the performance of bids, trade contracts and leases (other than Indebtedness), statutory obligations, surety bonds (other than bonds related to judgments or litigation), performance bonds and other obligations of a like nature incurred in the ordinary course of business;

          (g) easements, rights-of-way, restrictions and other similar encumbrances affecting real property which, in the aggregate, are not substantial in amount, and which do not in any case materially detract from the value of the property subject thereto or materially interfere with the ordinary conduct of the business of the applicable Person;

          (h) (i) Liens securing purchase money obligations of the Borrower or of Subsidiaries of the Borrower, for fixed or capital assets acquired after the Closing Date, provided that (A) such Liens do not at any time encumber any property other than the property financed by such Indebtedness, (B) the Indebtedness secured thereby does not exceed the cost or fair market value, whichever is lower, of the property being acquired on the date of acquisition and (C) such Liens attach to such property concurrently with or within 90 days after the acquisition thereof, and (ii) Liens securing any refinancing of such Indebtedness, provided that such Liens do not extend to additional property and the amount of the Indebtedness is not increased;

          (i) Liens securing judgments for the payment of money not constituting an Event of Default under Section 8.01(h) or securing appeal or other surety bonds related to such judgments;

          (j) Liens arising in the ordinary course of business under Oil and Gas Agreements to secure compliance with such agreements, provided that any such Lien referred to in this clause are for claims which are not delinquent or which are being contested in good faith by appropriate action and for which adequate reserves have been maintained in accordance with GAAP, and provided, further, that any such Lien referred to in this clause does not materially impair the use of the property covered by such Lien for the purposes for which such property is held by the Borrower or any Subsidiary or materially impair the value of such property subject thereto, and provided, further, that such Liens are limited to property that is the subject of the relevant Oil and Gas Agreement and any proceeds thereof; and

          (k) Liens not otherwise permitted by this Section 7.01 if at the time of, and after giving effect to, the creation or assumption of any such Lien, the aggregate of all obligations of the Borrower and its Subsidiaries secured by any Liens not otherwise permitted hereby does not exceed 10% of Consolidated Net Worth of the Borrower and its Subsidiaries.

     7.02 Foreign Subsidiaries and Joint Ventures.

          (a) Make or permit any Domestic Subsidiary to make any Investment in any Foreign Subsidiary or any Joint Venture unless the book value of all Investments (including such Investment then being made) in Foreign Subsidiaries and Joint Ventures made on or after the Closing Date does not exceed an amount equal to 30% of the total book value of all assets of the Borrower and its Subsidiaries calculated on a pro forma basis taking into account such Investment; or

          (b) Incur any Indebtedness owed by the Borrower to any Foreign Subsidiary or other Subsidiary that is not a Guarantor unless such Indebtedness is subordinated to the Obligations pursuant to terms that are substantially the same as the subordination terms applicable to the Guarantors pursuant to the Guaranty.

     7.03 Indebtedness of Subsidiaries. Permit any Subsidiary of the Borrower to create, incur, assume or suffer to exist any Indebtedness, except:

          (a) Indebtedness under the Loan Documents;

          (b) Guarantees in respect of Indebtedness otherwise permitted hereunder of the Borrower;

          (c) Indebtedness owed by any Subsidiary to (i) the Borrower, or (ii) another Subsidiary, provided that if such Subsidiary to whom such Indebtedness is owed is not a Guarantor, then such Indebtedness (other than Indebtedness owed by a Foreign Subsidiary to another Foreign Subsidiary) shall be subordinated to the Obligations pursuant to terms substantially the same as the subordination terms applicable to the Guarantors pursuant to the Guaranty;

          (d) purchase money Indebtedness permitted by Section 7.01(h); and

          (e) unsecured Indebtedness, provided that (i) both before and after such Indebtedness is created, incurred or assumed, no Default or Event of Default shall have occurred and be continuing, and (ii) the aggregate outstanding principal amount of such Indebtedness for all Subsidiaries taken together shall not exceed at any time an amount equal to 10% of Consolidated Net Worth.

          (f) secured Indebtedness, provided that (i) both before and after such Indebtedness is created, incurred or assumed, no Default or Event of Default shall have occurred and be continuing, and (ii) the aggregate outstanding principal amount of such Indebtedness for all Subsidiaries taken together shall not exceed at any time an amount equal to 5% of Consolidated Net Worth.

     7.04 Fundamental Changes. (A) Wind up, liquidate or dissolve its affairs, or (B) amalgamate or consolidate with, or merge into, or sell, lease or otherwise dispose of, in one transaction or a series of transactions, all or substantially all of its assets to, any other Person, or permit any other Person to amalgamate or consolidate with, or merge into, or sell, lease or otherwise dispose of all or substantially all of its assets to, it, except that this Section 7.04 shall not prohibit any of the following transactions, or any agreement to effect the same, provided that no Default has occurred and is continuing or would result therefrom:

          (a) any amalgamation, consolidation or merger, or sale or other disposition of assets (other than by lease) involving the Borrower or any of its consolidated Subsidiaries, provided that

          (i) in any such transaction involving the Borrower, the Borrower is the surviving, resulting or continuing Person in such merger, amalgamation or consolidation, or the transferee in such sale or other disposition (in any such case, the “Survivor”), or

          (ii) in any such transaction involving any Guarantor, the entity that constituted the Guarantor immediately prior thereto is the Survivor, or

          (b) the Guarantor shall have amalgamated or merged with and into the Borrower and the Borrower shall be the Survivor, or

          (c) if neither the entity that constituted the Guarantor immediately prior thereto nor the Borrower is the Survivor, the Survivor shall execute and deliver to the Administrative Agent an instrument, in form and substance satisfactory to it, whereby the Survivor shall assume all rights and obligations of the Guarantor under the Guaranty to which the Guarantor is a party),

          (i) in any such transaction not involving the Borrower or a Guarantor, a wholly-owned Subsidiary of the Borrower is the Survivor, and

          (ii) in the case of any transaction specified in the foregoing clauses 7.04(a)(i) or (ii) or 7.04(c)(i) (A) the Borrower, the Guarantor (except in a case specified in clause (a)(ii)) and their Subsidiaries shall be in compliance, on a pro forma basis after giving effect to such transaction, with the covenants contained in this Article VII recomputed as of the last day of the most recently ended fiscal quarter of the Borrower, the Guarantor and their Subsidiaries as if such transaction had occurred on the first day of each relevant period for testing such compliance, (B) with respect to any amalgamation, consolidation or merger, or sale or other disposition of assets with or to a Person not a consolidated Subsidiary of the Borrower, the Borrower shall have delivered to the Administrative Agent an officer’s certificate to such effect, together with all relevant financial information and calculations demonstrating such compliance and (C) in a transaction of the type described in clause (a)(ii) above in which a Guarantor is not the Survivor, the Administrative Agent shall have received an opinion reasonably satisfactory in form, scope and substance to the Administrative Agent, of counsel reasonably satisfactory to the Administrative Agent, addressing such matters in connection with such transaction as the Administrative Agent or such Lender may reasonably request, and such other documentation as the Administrative Agent may reasonably request;

          (d) any winding up, liquidation or dissolution of any consolidated Subsidiary if in the reasonable judgment of the board of directors (or other managing group) of such Subsidiary, such winding up, liquidation or dissolution is in the best interests of the Borrower and its consolidated Subsidiaries taken as a whole and is not materially disadvantageous to any Lender, provided, however, with respect to any winding up, liquidation or dissolution of any Guarantor the owner of all of the capital stock of the Guarantor immediately prior to such event shall be the Borrower or a wholly-owned Subsidiary of the Borrower;

          (e) transactions and transfers of assets among or between Loan Parties, or among and between Loan Parties and wholly-owned Subsidiaries or among and between wholly-owned Subsidiaries, provided that any transaction or transfers described in this clause (e) that involves the Borrower shall be subject to the requirements of Section 7.04(a)(i) and any transaction or transfer that involves a Guarantor shall be subject to the requirements of Section 7.04(a)(ii); and

          (f) dispositions (whether in the form of a sale of assets or by merger) not otherwise permitted hereunder which are made for fair market value; provided that (i) any merger shall be subject to the requirements set forth in Section 7.04(a), (ii) the aggregate sales price from such disposition shall be paid in cash or otherwise on payment terms satisfactory to the applicable Loan Party or Subsidiary, and (iii) the aggregate book value of all assets of the Borrower and its consolidated Subsidiaries, taken as a whole, shall not be reduced at any time to an amount which is less than the Asset Threshold Value. As used in this Section “Asset Threshold Value” means an amount equal to 80% of the aggregate book value of all assets of the Borrower and its consolidated Subsidiaries, taken as a whole, on December 31, 2009, as reflected in the Audited Financial Statements. No disposition (or series of dispositions) shall be permitted if, following such disposition or series of dispositions, the aggregate book value of all assets of the Borrower and its consolidated Subsidiaries, taken as a whole, would be less than the Asset Threshold Value.

     7.05 Hedging Agreements. Enter into any Swap Contracts other than in the ordinary course of business for the purpose of directly mitigating risks to which the Borrower or its Subsidiaries are exposed in the conduct of their business and not for purposes of speculation.

     7.06 Change in Nature of Business. (a) Engage in any material line of business substantially different from those lines of business conducted by the Borrower and its Subsidiaries on the date hereof or any business substantially related or incidental thereto and (b) permit Ambar Lone Star Fluids Services LLC to conduct any operations.

     7.07 Transactions with Affiliates. Enter into any material transaction of any kind with any Affiliate of the Borrower, whether or not in the ordinary course of business, other than on fair and reasonable terms substantially as favorable to the Borrower or such Subsidiary as would be obtainable by the Borrower or such Subsidiary at the time in a comparable arm’s length transaction with a Person other than an Affiliate, except that the foregoing shall not apply to transactions among the Borrower and one or more of its wholly-owned Subsidiaries, or between or among the Borrower’s wholly-owned Subsidiaries.

     7.08 Burdensome Agreements. Enter into any Contractual Obligation (other than this Agreement or any other Loan Document) that limits the ability of any Subsidiary to pay dividends or make other payments or distributions to the Borrower or any Guarantor or to otherwise transfer property to the Borrower or any Guarantor, except restrictions that could not reasonably be expected to impair the Borrower’s ability to repay the Obligations as and when due.

     7.09 Use of Proceeds.

          (a) Use the proceeds of any Credit Extension, whether directly or indirectly to purchase or carry margin stock (within the meaning of Regulation U of the FRB) or to extend credit to others for the purpose of purchasing or carrying margin stock or to refund indebtedness originally incurred for such purpose; or

          (b) Use the proceeds of any Credit Extension in connection with the acquisition of a voting interest of five percent or more in any Person if such acquisition is opposed by the board of directors or management of such Person.

     7.10 Financial Covenants.

          (a) Permit the Debt to Capitalization Ratio, expressed as a percentage, to exceed at any time (i) 35% or (ii) if a Permanent Credit Facility exists, the lesser of (A) the Debt to Capitalization Ratio as set forth in such Permanent Credit Facility and (B) 45%.

          (b) Permit the Interest Coverage Ratio as of the last day of a fiscal quarter to be less than 3.00 to 1.00.

ARTICLE VIII

EVENTS OF DEFAULT AND REMEDIES

     8.01 Events of Default. Any of the following shall constitute an Event of Default:

          (a) Non-Payment. The Borrower or any other Loan Party fails to pay (i) when and as required to be paid herein, any amount of principal of any Loan, or (ii) within three days after the same becomes due, any interest on any Loan, or any fee due hereunder, or (iii) within five days after the same becomes due, any other amount payable hereunder or under any other Loan Document; or

          (b) Specific Covenants. The Borrower fails to perform or observe any term, covenant or agreement contained in any of Sections 6.03(a), 6.05(a) or 6.11 or Article VII; or

          (c) Other Defaults. Any Loan Party fails to perform or observe any other covenant or agreement (not specified in subsection (a) or (b) above) contained in any Loan Document on its part to be performed or observed and such failure continues for 30 days after delivery of written notice thereof to the Borrower from the Administrative Agent acting on the instructions of any Lender; or

          (d) Representations and Warranties. Any representation, warranty, certification or statement of fact made or deemed made by or on behalf of the Borrower or any other Loan Party herein, in any other Loan Document, or in any document delivered in connection herewith or therewith shall be incorrect or misleading when made or deemed made; or

          (e) Cross-Default. (i) The Borrower or any Subsidiary (A) fails to make any payment when due (whether by scheduled maturity, required prepayment, acceleration, demand, or otherwise) in respect of any Indebtedness or Guarantee (other than Indebtedness hereunder and Indebtedness under Swap Contracts) having an aggregate principal amount (including undrawn committed or available amounts and including amounts owing to all creditors under any combined or syndicated credit arrangement) of more than the Threshold Amount, or (B) fails to observe or perform any other agreement or condition relating to any such Indebtedness or Guarantee or contained in any instrument or agreement evidencing, securing or relating thereto,

or any other event occurs, the effect of which default or other event is to cause, or to permit the holder or holders of such Indebtedness or the beneficiary or beneficiaries of such Guarantee (or a trustee or agent on behalf of such holder or holders or beneficiary or beneficiaries) to cause, with the giving of notice if required, such Indebtedness to be demanded or to become due or to be repurchased, prepaid, defeased or redeemed (automatically or otherwise), or an offer to repurchase, prepay, defease or redeem such Indebtedness to be made, prior to its stated maturity, or such Guarantee to become payable or cash collateral in respect thereof to be demanded; or (ii) there occurs under any Swap Contract an Early Termination Date (as defined in such Swap Contract) resulting from (A) any event of default under such Swap Contract as to which the Borrower or any Subsidiary is the Defaulting Party (as defined in such Swap Contract) or (B) any Termination Event (as so defined) under such Swap Contract as to which the Borrower or any Subsidiary is an Affected Party (as so defined) and, in either event, the Swap Termination Value owed by the Borrower or such Subsidiary as a result thereof is greater than the Threshold Amount; or

          (f) Insolvency Proceedings, Etc. Any Loan Party or any of its Subsidiaries institutes or consents to the institution of any proceeding under any Debtor Relief Law, or makes an assignment for the benefit of creditors; or applies for or consents to the appointment of any receiver, trustee, custodian, conservator, liquidator, or similar officer for it or for all or any material part of its property; or any receiver, trustee, custodian, conservator, liquidator, or similar officer is appointed without the application or consent of such Person and the appointment continues undischarged or unstayed for 60 calendar days; or any proceeding under any Debtor Relief Law relating to any such Person or to all or any material part of its property is instituted without the consent of such Person and continues undismissed or unstayed for 60 calendar days, or an order for relief is entered in any such proceeding; or the Borrower or any of its Subsidiaries shall take any corporate, partnership or company action in furtherance of the foregoing; or

          (g) Inability to Pay Debts; Attachment. (i) The Borrower or any Subsidiary becomes unable or admits in writing its inability or fails generally to pay its debts as they become due, or (ii) any writ or warrant of attachment or execution or similar process is issued or levied against all or any property of such Person if such property is a material part of the property of the Borrower and its Subsidiaries taken as a whole and is not released, vacated or fully bonded within 30 days after its issue or levy; or

          (h) Judgments. There is entered against the Borrower or any Subsidiary (i) a final judgment or order for the payment of money in an aggregate amount exceeding the Threshold Amount (to the extent not covered by independent third-party insurance as to which the insurer does not dispute coverage), or (ii) any one or more non-monetary final judgments that have, or could reasonably be expected to have, individually or in the aggregate, a Material Adverse Effect and, in either case, (A) enforcement proceedings are commenced by any creditor upon such judgment or order, or (B) the same shall remain undischarged for a period of 20 consecutive days during which a stay of enforcement of such judgment, by reason of a pending appeal or otherwise, is not in effect; or

          (i) ERISA. (i) An ERISA Event occurs with respect to a Pension Plan or Multiemployer Plan which has resulted or could reasonably be expected to result in liability of the Borrower under Title IV of ERISA to the Pension Plan, Multiemployer Plan or the PBGC in

an aggregate amount in excess of the Threshold Amount, or (ii) the Borrower or any ERISA Affiliate fails to pay when due, after the expiration of any applicable grace period, any installment payment with respect to its withdrawal liability under Section 4201 of ERISA under a Multiemployer Plan in an aggregate amount in excess of the Threshold Amount; or

          (j) Invalidity of Loan Documents. Any Loan Document, at any time after its execution and delivery and for any reason other than as expressly permitted hereunder or thereunder or satisfaction in full of all the Obligations, ceases to be in full force and effect; or any Loan Party or any other Person contests in any manner the validity or enforceability of any Loan Document; or any Loan Party denies that it has any or further liability or obligation under any Loan Document, or purports to revoke, terminate or rescind any Loan Document; or

     8.02 Remedies Upon Event of Default. If any Event of Default occurs and is continuing, the Administrative Agent shall, at the request of, or may, with the consent of, the Required Lenders, take any or all of the following actions:

          (a) declare the commitment of each Lender to make Loans to be terminated, whereupon such commitments and obligation shall be terminated;

          (b) declare the unpaid principal amount of all outstanding Loans, all interest accrued and unpaid thereon, and all other amounts owing or payable hereunder or under any other Loan Document to be immediately due and payable, without presentment, demand, protest, notice of intent to accelerate, notice of acceleration, or other notice of any kind, all of which are hereby expressly waived by the Borrower; and

          (c) exercise on behalf of itself and the Lenders all rights and remedies available to it and the Lenders under the Loan Documents or applicable Law;

provided, however, that upon the occurrence of an actual or deemed entry of an order for relief with respect to the Borrower under the Bankruptcy Code of the United States, the obligation of each Lender to make Loans shall automatically terminate, the unpaid principal amount of all outstanding Loans and all interest and other amounts as aforesaid shall automatically become due and payable, in each case without further act of the Administrative Agent or any Lender.

     8.03 Application of Funds. After the exercise of remedies provided for in Section 8.02 (or after the Loans have automatically become immediately due and payable), any amounts received on account of the Obligations shall be applied by the Administrative Agent in the following order:

     First, to payment of that portion of the Obligations constituting fees, indemnities, expenses and other amounts (including fees, charges and disbursements of counsel to the Administrative Agent and amounts payable under Article III) payable to the Administrative Agent in its capacity as such;

     Second, to payment of that portion of the Obligations constituting fees, indemnities and other amounts (other than principal and interest) payable to the Lenders (including fees, charges and disbursements of counsel to the respective Lenders and amounts payable under Article III),

ratably among them in proportion to the amounts described in this clause Second payable to them;

     Third, to payment of that portion of the Obligations constituting accrued and unpaid interest on the Loans and other Obligations, ratably among the Lenders in proportion to the respective amounts described in this clause Third payable to them;

     Fourth, to payment of that portion of the Obligations constituting unpaid principal of the Loans, ratably among the Lenders in proportion to the respective amounts described in this clause Fourth held by them; and

     Last, the balance, if any, after all of the Obligations have been indefeasibly paid in full, to the Borrower or as otherwise required by Law.

ARTICLE IX

ADMINISTRATIVE AGENT

     9.01 Appointment and Authority. Each of the Lenders hereby irrevocably appoints Wells Fargo to act on its behalf as the Administrative Agent hereunder and under the other Loan Documents and authorizes the Administrative Agent to take such actions on its behalf and to exercise such powers as are delegated to the Administrative Agent by the terms hereof or thereof, together with such actions and powers as are reasonably incidental thereto. The provisions of this Article are solely for the benefit of the Administrative Agent and the Lenders, and neither the Borrower nor any other Loan Party shall have rights as a third party beneficiary of any of such provisions.

     9.02 Rights as a Lender. The Person serving as the Administrative Agent hereunder shall have the same rights and powers in its capacity as a Lender as any other Lender and may exercise the same as though it were not the Administrative Agent and the term “Lender” or “Lenders” shall, unless otherwise expressly indicated or unless the context otherwise requires, include the Person serving as the Administrative Agent hereunder in its individual capacity. Such Person and its Affiliates may accept deposits from, lend money to, act as the financial advisor or in any other advisory capacity for and generally engage in any kind of business with the Borrower or any Subsidiary or other Affiliate thereof as if such Person were not the Administrative Agent hereunder and without any duty to account therefor to the Lenders.

     9.03 Exculpatory Provisions. The Administrative Agent shall not have any duties or obligations except those expressly set forth herein and in the other Loan Documents. Without limiting the generality of the foregoing, the Administrative Agent:

          (a) shall not be subject to any fiduciary or other implied duties, regardless of whether a Default has occurred and is continuing;

          (b) shall not have any duty to take any discretionary action or exercise any discretionary powers, except discretionary rights and powers expressly contemplated hereby or by the other Loan Documents that the Administrative Agent is required to exercise as directed in writing by the Required Lenders (or such other number or percentage of the Lenders as shall be

expressly provided for herein or in the other Loan Documents), provided that the Administrative Agent shall not be required to take any action that, in its opinion or the opinion of its counsel, may expose the Administrative Agent to liability or that is contrary to any Loan Document or applicable law; and

          (c) shall not, except as expressly set forth herein and in the other Loan Documents, have any duty to disclose, and shall not be liable for the failure to disclose, any information relating to the Borrower or any of its Affiliates that is communicated to or obtained by the Person serving as the Administrative Agent or any of its Affiliates in any capacity.

     The Administrative Agent shall not be liable for any action taken or not taken by it (i) with the consent or at the request of the Required Lenders (or such other number or percentage of the Lenders as shall be necessary, or as the Administrative Agent shall believe in good faith shall be necessary, under the circumstances as provided in Sections 10.01 and 8.02) or (ii) in the absence of its own gross negligence or willful misconduct. The Administrative Agent shall be deemed not to have knowledge of any Default unless and until notice describing such Default is given to the Administrative Agent by the Borrower or a Lender.

     The Administrative Agent shall not be responsible for or have any duty to ascertain or inquire into (i) any statement, warranty or representation made in or in connection with this Agreement or any other Loan Document, (ii) the contents of any certificate, report or other document delivered hereunder or thereunder or in connection herewith or therewith, (iii) the performance or observance of any of the covenants, agreements or other terms or conditions set forth herein or therein or the occurrence of any Default, (iv) the validity, enforceability, effectiveness or genuineness of this Agreement, any other Loan Document or any other agreement, instrument or document or (v) the satisfaction of any condition set forth in Article IV or elsewhere herein, other than to confirm receipt of items expressly required to be delivered to the Administrative Agent.

     9.04 Reliance by Administrative Agent. The Administrative Agent shall be entitled to rely upon, and shall not incur any liability for relying upon, any notice, request, certificate, consent, statement, instrument, document or other writing (including any electronic message, Internet or intranet website posting or other distribution) believed by it to be genuine and to have been signed, sent or otherwise authenticated by the proper Person. The Administrative Agent also may rely upon any statement made to it orally or by telephone and believed by it to have been made by the proper Person, and shall not incur any liability for relying thereon. In determining compliance with any condition hereunder to the making of a Loan that by its terms must be fulfilled to the satisfaction of a Lender, the Administrative Agent may presume that such condition is satisfactory to such Lender unless the Administrative Agent shall have received notice to the contrary from such Lender prior to the making of such Loan. The Administrative Agent may consult with legal counsel (who may be counsel for the Borrower), independent accountants and other experts selected by it, and shall not be liable for any action taken or not taken by it in accordance with the advice of any such counsel, accountants or experts.

     9.05 Delegation of Duties. The Administrative Agent may perform any and all of its duties and exercise its rights and powers hereunder or under any other Loan Document by or through any one or more sub agents appointed by the Administrative Agent. The Administrative

Agent and any such sub agent may perform any and all of its duties and exercise its rights and powers by or through their respective Related Parties. The exculpatory provisions of this Article shall apply to any such sub agent and to the Related Parties of the Administrative Agent and any such sub agent, and shall apply to their respective activities in connection with the syndication of the credit facilities provided for herein as well as activities as Administrative Agent.

     9.06 Resignation of Administrative Agent. The Administrative Agent may at any time give notice of its resignation to the Lenders and the Borrower. Upon receipt of any such notice of resignation, the Required Lenders shall have the right, in consultation with the Borrower, to appoint a successor, which shall be a bank with an office in the United States, or an Affiliate of any such bank with an office in the United States. If no such successor shall have been so appointed by the Required Lenders and shall have accepted such appointment within 30 days after the retiring Administrative Agent gives notice of its resignation, then the retiring Administrative Agent may on behalf of the Lenders, appoint a successor Administrative Agent meeting the qualifications set forth above; provided that if the Administrative Agent shall notify the Borrower and the Lenders that no qualifying Person has accepted such appointment, then such resignation shall nonetheless become effective in accordance with such notice and (1) the retiring Administrative Agent shall be discharged from its duties and obligations hereunder and under the other Loan Documents (except that in the case of any collateral security held by the Administrative Agent on behalf of the Lenders under any of the Loan Documents, the retiring Administrative Agent shall continue to hold such collateral security until such time as a successor Administrative Agent is appointed) and (2) all payments, communications and determinations provided to be made by, to or through the Administrative Agent shall instead be made by or to each Lender directly, until such time as the Required Lenders appoint a successor Administrative Agent as provided for above in this Section. Upon the acceptance of a successor’s appointment as Administrative Agent hereunder, such successor shall succeed to and become vested with all of the rights, powers, privileges and duties of the retiring (or retired) Administrative Agent, and the retiring Administrative Agent shall be discharged from all of its duties and obligations hereunder or under the other Loan Documents (if not already discharged therefrom as provided above in this Section). The fees payable by the Borrower to a successor Administrative Agent shall be the same as those payable to its predecessor unless otherwise agreed between the Borrower and such successor. After the retiring Administrative Agent’s resignation hereunder and under the other Loan Documents, the provisions of this Article and Section 10.04 shall continue in effect for the benefit of such retiring Administrative Agent, its sub agents and their respective Related Parties in respect of any actions taken or omitted to be taken by any of them while the retiring Administrative Agent was acting as Administrative Agent.

     9.07 Non-Reliance on Administrative Agent and Other Lenders. Each Lender acknowledges that it has, independently and without reliance upon the Administrative Agent or any other Lender or any of their Related Parties and based on such documents and information as it has deemed appropriate, made its own credit analysis and decision to enter into this Agreement. Each Lender also acknowledges that it will, independently and without reliance upon the Administrative Agent or any other Lender or any of their Related Parties and based on such documents and information as it shall from time to time deem appropriate, continue to make its own decisions in taking or not taking action under or based upon this Agreement, any other Loan Document or any related agreement or any document furnished hereunder or thereunder.

     9.08 No Other Duties, Etc. Anything herein to the contrary notwithstanding, none of the Bookrunners, Arrangers or agents, if any, listed on the cover page hereof shall have any powers, duties or responsibilities under this Agreement or any of the other Loan Documents, except in its capacity, as applicable, as the Administrative Agent or a Lender.

     9.09 Administrative Agent May File Proofs of Claim. In case of the pendency of any receivership, insolvency, liquidation, bankruptcy, reorganization, arrangement, adjustment, composition or other judicial proceeding relative to any Loan Party, the Administrative Agent (irrespective of whether the principal of any Loan shall then be due and payable as herein expressed or by declaration or otherwise and irrespective of whether the Administrative Agent shall have made any demand on the Borrower) shall be entitled and empowered, by intervention in such proceeding or otherwise

          (a) to file and prove a claim for the whole amount of the principal and interest owing and unpaid in respect of the Loans and all other Obligations that are owing and unpaid and to file such other documents as may be necessary or advisable in order to have the claims of the Lenders and the Administrative Agent (including any claim for the reasonable compensation, expenses, disbursements and advances of the Lenders and the Administrative Agent and their respective agents and counsel and all other amounts due the Lenders and the Administrative Agent under Sections 2.09 and 10.04) allowed in such judicial proceeding; and

          (b) to collect and receive any monies or other property payable or deliverable on any such claims and to distribute the same;

and any custodian, receiver, assignee, trustee, liquidator, sequestrator or other similar official in any such judicial proceeding is hereby authorized by each Lender to make such payments to the Administrative Agent and, in the event that the Administrative Agent shall consent to the making of such payments directly to the Lenders, to pay to the Administrative Agent any amount due for the reasonable compensation, expenses, disbursements and advances of the Administrative Agent and its agents and counsel, and any other amounts due the Administrative Agent under Sections 2.09 and 10.04.

     Nothing contained herein shall be deemed to authorize the Administrative Agent to authorize or consent to or accept or adopt on behalf of any Lender any plan of reorganization, arrangement, adjustment or composition affecting the Obligations or the rights of any Lender or to authorize the Administrative Agent to vote in respect of the claim of any Lender in any such proceeding.

     9.10 Guaranty Matters. The Lenders irrevocably authorize the Administrative Agent, at its option and in its discretion, to release any Guarantor from its obligations under the Guaranty if such Person ceases to be a Subsidiary as a result of a transaction permitted hereunder.

     Upon request by the Administrative Agent at any time, the Required Lenders will confirm in writing the Administrative Agent’s authority to release any Guarantor from its obligations under the Guaranty pursuant to this Section 9.10.

ARTICLE X

MISCELLANEOUS

     10.01 Amendments, Etc. No amendment or waiver of any provision of this Agreement or any other Loan Document, and no consent to any departure by the Borrower or any other Loan Party therefrom, shall be effective unless in writing signed by the Required Lenders and the Borrower or the applicable Loan Party, as the case may be, and acknowledged by the Administrative Agent, and each such waiver or consent shall be effective only in the specific instance and for the specific purpose for which given; provided, however, that no such amendment, waiver or consent shall:

          (a) waive any condition set forth in Section 4.01(a) without the written consent of each Lender;

          (b) extend or increase the Commitment of any Lender (or reinstate any Commitment terminated pursuant to Section 8.02) without the written consent of such Lender;

          (c) postpone any date fixed by this Agreement or any other Loan Document for any payment of principal, interest, fees or other amounts due to the Lenders (or any of them) hereunder or under any other Loan Document without the written consent of each Lender directly affected thereby;

          (d) reduce the principal of, or the rate of interest specified herein on, any Loan, or (subject to clause (iv) of the second proviso to this Section 10.01) any fees or other amounts payable hereunder or under any other Loan Document without the written consent of each Lender directly affected thereby; provided, however, that only the consent of the Required Lenders shall be necessary (i) to amend the definition of “Default Rate” or (ii) to amend any financial covenant hereunder (or any defined term used therein) even if the effect of such amendment would be to reduce the rate of interest on any Loan or to reduce any fee payable hereunder;

          (e) change Section 2.13 or Section 8.03 in a manner that would alter the pro rata sharing of payments required thereby without the written consent of each Lender;

          (f) change any provision of this Section or the definition of “Required Lenders” or any other provision hereof specifying the number or percentage of Lenders required to amend, waive or otherwise modify any rights hereunder or make any determination or grant any consent hereunder, without the written consent of each Lender; or

          (g) release all or substantially all of the Guarantors from the Guaranty without the written consent of each Lender;

and, provided, further, that (i) no amendment, waiver or consent shall, unless in writing and signed by the Administrative Agent in addition to the Lenders required above, affect the rights or duties of the Administrative Agent under this Agreement or any other Loan Document; and (ii) Section 10.06(h) may not be amended, waived or otherwise modified without the consent of each Granting Lender all or any part of whose Loans are being funded by an SPC at the time of such

amendment, waiver or other modification; and (iii) the Fee Letter may be amended, or rights or privileges thereunder waived, in a writing executed only by the parties thereto.

     10.02 Notices; Effectiveness; Electronic Communication.

          (a) Notices Generally. Except in the case of notices and other communications expressly permitted to be given by telephone (and except as provided in subsection (b) below), all notices and other communications provided for herein shall be in writing and shall be delivered by hand or overnight courier service, mailed by certified or registered mail or sent by telecopier as follows, and all notices and other communications expressly permitted hereunder to be given by telephone shall be made to the applicable telephone number, as follows:

          (i) if to the Borrower or the Administrative Agent, to the address, telecopier number, electronic mail address or telephone number specified for such Person on Schedule 10.02; and

          (ii) if to any other Lender, to the address, telecopier number, electronic mail address or telephone number specified in its Administrative Questionnaire.

     Notices sent by hand or overnight courier service, or mailed by certified or registered mail, shall be deemed to have been given when received; notices sent by telecopier shall be deemed to have been given when sent (except that, if not given during normal business hours for the recipient, shall be deemed to have been given at the opening of business on the next business day for the recipient). Notices delivered through electronic communications to the extent provided in subsection (b) below, shall be effective as provided in such subsection (b).

          (b) Electronic Communications. Notices and other communications to the Lenders hereunder may be delivered or furnished by electronic communication (including e mail and Internet or intranet websites) pursuant to procedures approved by the Administrative Agent, provided that the foregoing shall not apply to notices to any Lender pursuant to Article II if such Lender has notified the Administrative Agent that it is incapable of receiving notices under such Article by electronic communication. The Administrative Agent or the Borrower may, in its discretion, agree to accept notices and other communications to it hereunder by electronic communications pursuant to procedures approved by it, provided that approval of such procedures may be limited to particular notices or communications.

     Unless the Administrative Agent otherwise prescribes, (i) notices and other communications sent to an e-mail address shall be deemed received upon the sender’s receipt of an acknowledgement from the intended recipient (such as by the “return receipt requested” function, as available, return e-mail or other written acknowledgement), provided that if such notice or other communication is not sent during the normal business hours of the recipient, such notice or communication shall be deemed to have been sent at the opening of business on the next business day for the recipient, and (ii) notices or communications posted to an Internet or intranet website shall be deemed received upon the deemed receipt by the intended recipient at its e-mail address as described in the foregoing clause (i) of notification that such notice or communication is available and identifying the website address therefor.

          (c) Change of Address, Etc. Each of the Borrower and the Administrative Agent may change its address, telecopier or telephone number for notices and other communications hereunder by notice to the other parties hereto. Each other Lender may change its address, telecopier or telephone number for notices and other communications hereunder by notice to the Borrower and the Administrative Agent.

          (d) Reliance by Administrative Agent and Lenders. The Administrative Agent and the Lenders shall be entitled to rely and act upon any notices (including telephonic Loan Notices) purportedly given by or on behalf of the Borrower even if (i) such notices were not made in a manner specified herein, were incomplete or were not preceded or followed by any other form of notice specified herein, or (ii) the terms thereof, as understood by the recipient, varied from any confirmation thereof. The Borrower shall indemnify the Administrative Agent, each Lender and the Related Parties of each of them from all losses, costs, expenses and liabilities resulting from the reliance by such Person on each notice purportedly given by or on behalf of the Borrower. All telephonic notices to and other telephonic communications with the Administrative Agent may be recorded by the Administrative Agent, and each of the parties hereto hereby consents to such recording.

     10.03 No Waiver; Cumulative Remedies. No failure by any Lender or the Administrative Agent to exercise, and no delay by any such Person in exercising, any right, remedy, power or privilege hereunder shall operate as a waiver thereof; nor shall any single or partial exercise of any right, remedy, power or privilege hereunder preclude any other or further exercise thereof or the exercise of any other right, remedy, power or privilege. The rights, remedies, powers and privileges herein provided are cumulative and not exclusive of any rights, remedies, powers and privileges provided by law.

     10.04 Expenses; Indemnity; Damage Waiver.

          (a) Costs and Expenses. The Borrower shall pay (i) all reasonable out of pocket expenses incurred by the Administrative Agent and its Affiliates (including the reasonable fees, charges and disbursements of counsel for the Administrative Agent), in connection with the syndication of the credit facilities provided for herein, the preparation, negotiation, execution, delivery and administration of this Agreement and the other Loan Documents or any amendments, modifications or waivers of the provisions hereof or thereof (whether or not the transactions contemplated hereby or thereby shall be consummated), and (ii) all out of pocket expenses incurred by the Administrative Agent or any Lender (including the fees, charges and disbursements of any counsel for the Administrative Agent or any Lender), in connection with the enforcement or protection of its rights (A) in connection with this Agreement and the other Loan Documents, including its rights under this Section, or (B) in connection with the Loans made, including all such out of pocket expenses incurred during any workout, restructuring or negotiations in respect of such Loans.

          (b) Indemnification by the Borrower. The Borrower shall indemnify the Administrative Agent (and any sub-agent thereof), each Lender, and each Related Party of any of the foregoing Persons (each such Person being called an “Indemnitee”) against, and hold each Indemnitee harmless from, any and all losses, claims, damages, liabilities and related expenses (including the fees, charges and disbursements of any counsel for any Indemnitee), incurred by

any Indemnitee or asserted against any Indemnitee by any third party or by the Borrower or any other Loan Party arising out of, in connection with, or as a result of (i) the syndication of the credit facilities provided for herein, the preparation, negotiation execution or delivery of this Agreement, any other Loan Document or any agreement or instrument contemplated hereby or thereby, the performance by the parties hereto of their respective obligations hereunder or thereunder or the consummation of the transactions contemplated hereby or thereby, (ii) any Loan or the use or proposed use of the proceeds therefrom, (iii) any actual or alleged presence or release of Hazardous Materials on or from any property owned or operated by the Borrower or any of its Subsidiaries, or any Environmental Liability related in any way to the Borrower or any of its Subsidiaries, or (iv) any actual or prospective claim, litigation, investigation or proceeding relating to any of the foregoing, whether based on contract, tort or any other theory, whether brought by a third party or by the Borrower or any other Loan Party, and regardless of whether any Indemnitee is a party thereto, in all cases, whether or not caused by or arising, in whole or in part, out of the comparative, contributory or sole negligence of the Indemnitee; provided that such indemnity shall not, as to any Indemnitee, be available to the extent that such losses, claims, damages, liabilities or related expenses are determined by a court of competent jurisdiction by final and nonappealable judgment to have resulted from the gross negligence or willful misconduct of, or a breach of a Loan Document in any material respect by such Indemnitee.

          (c) Reimbursement by Lenders. To the extent that the Borrower for any reason fails to indefeasibly pay any amount required under subsection (a) or (b) of this Section to be paid by it to the Administrative Agent (or any sub-agent thereof) or any Related Party of any of the foregoing, each Lender severally agrees to pay to the Administrative Agent (or any such sub-agent) or such Related Party, as the case may be, such Lender’s Applicable Percentage (determined as of the time that the applicable unreimbursed expense or indemnity payment is sought) of such unpaid amount, provided that the unreimbursed expense or indemnified loss, claim, damage, liability or related expense, as the case may be, was incurred by or asserted against the Administrative Agent (or any such sub-agent) in its capacity as such, or against any Related Party of any of the foregoing acting for the Administrative Agent (or any such sub-agent) in connection with such capacity. The obligations of the Lenders under this subsection (c) are subject to the provisions of Section 2.12(d).

          (d) Waiver of Consequential Damages, Etc. To the fullest extent permitted by applicable law, no party hereto shall assert, and each party hereto hereby waives, any claim against any Indemnitee, on any theory of liability, for special, indirect, consequential or punitive damages (as opposed to direct or actual damages) arising out of, in connection with, or as a result of, this Agreement, any other Loan Document or any agreement or instrument contemplated hereby, the transactions contemplated hereby or thereby, any Loan or the use of the proceeds thereof. No Indemnitee referred to in subsection (b) above shall be liable for any damages arising from the use by unintended recipients of any information or other materials distributed by it through telecommunications, electronic or other information transmission systems in connection with this Agreement or the other Loan Documents or the transactions contemplated hereby or thereby.

          (e) Payments. All amounts due under this Section shall be payable not later than ten Business Days after demand therefor.

          (f) Survival. The agreements in this Section shall survive the resignation of the Administrative Agent, the termination of the Aggregate Commitments and the repayment, satisfaction or discharge of all the other Obligations.

     10.05 Payments Set Aside. To the extent that any payment by or on behalf of the Borrower is made to the Administrative Agent or any Lender, or the Administrative Agent or any Lender exercises its right of setoff, and such payment or the proceeds of such setoff or any part thereof is subsequently invalidated, declared to be fraudulent or preferential, set aside or required (including pursuant to any settlement entered into by the Administrative Agent or such Lender in its discretion) to be repaid to a trustee, receiver or any other party, in connection with any proceeding under any Debtor Relief Law or otherwise, then (a) to the extent of such recovery, the obligation or part thereof originally intended to be satisfied shall be revived and continued in full force and effect as if such payment had not been made or such setoff had not occurred, and (b) each Lender severally agrees to pay to the Administrative Agent upon demand its applicable share (without duplication) of any amount so recovered from or repaid by the Administrative Agent, plus interest thereon from the date of such demand to the date such payment is made at a rate per annum equal to the Federal Funds Rate from time to time in effect. The obligations of the Lenders under clause (b) of the preceding sentence shall survive the payment in full of the Obligations and the termination of this Agreement.

     10.06 Successors and Assigns.

          (a) Successors and Assigns Generally. The provisions of this Agreement shall be binding upon and inure to the benefit of the parties hereto and their respective successors and assigns permitted hereby, except that the Borrower may not assign or otherwise transfer any of its rights or obligations hereunder without the prior written consent of the Administrative Agent and each Lender and no Lender may assign or otherwise transfer any of its rights or obligations hereunder except (i) to an Eligible Assignee in accordance with the provisions of subsection (b) of this Section, (ii) by way of participation in accordance with the provisions of subsection (d) of this Section, (iii) by way of pledge or assignment of a security interest subject to the restrictions of subsection (f) of this Section, or (iv) to an SPC in accordance with the provisions of subsection (h) of this Section (and any other attempted assignment or transfer by any party hereto shall be null and void). Nothing in this Agreement, expressed or implied, shall be construed to confer upon any Person (other than the parties hereto, their respective successors and assigns permitted hereby, Participants to the extent provided in subsection (d) of this Section and, to the extent expressly contemplated hereby, the Related Parties of each of the Administrative Agent and the Lenders) any legal or equitable right, remedy or claim under or by reason of this Agreement.

          (b) Assignments by Lenders. Any Lender may, upon obtaining written consent of the Borrower, such consent not to be unreasonably conditioned, withheld or delayed, at any time assign to one or more Eligible Assignees all or a portion of its rights and obligations under this Agreement (including all or a portion of its Commitment and the Loans at the time owing to it); provided that

          (i) except in the case of an assignment of the entire remaining amount of the assigning Lender’s Commitment and the Loans at the time owing to it or in the case

of an assignment to a Lender or an Affiliate of a Lender, the aggregate amount of the Commitment (which for this purpose includes Loans outstanding thereunder) or, if the Commitment is not then in effect, the principal outstanding balance of the Loans of the assigning Lender subject to each such assignment, determined as of the date the Assignment and Assumption with respect to such assignment is delivered to the Administrative Agent or, if “Trade Date” is specified in the Assignment and Assumption, as of the Trade Date, shall not be less than $5,000,000 unless each of the Administrative Agent and, so long as no Event of Default has occurred and is continuing, the Borrower otherwise consents (each such consent not to be unreasonably withheld or delayed);

          (ii) each partial assignment shall be made as an assignment of a proportionate part of all the assigning Lender’s rights and obligations under this Agreement with respect to the Loans or the Commitment assigned;

          (iii) any assignment of a Commitment must be approved by the Administrative Agent unless the Person that is the proposed assignee is itself a Lender (whether or not the proposed assignee would otherwise qualify as an Eligible Assignee); and

          (iv) the parties to each assignment shall execute and deliver to the Administrative Agent an Assignment and Assumption, together with a processing and recordation fee of $3,500 (unless the Eligible Assignee is an Affiliate of a Lender, in which case such fee shall not apply), and the Eligible Assignee, if it shall not be a Lender, shall deliver to the Administrative Agent an Administrative Questionnaire.

     Subject to acceptance and recording thereof by the Administrative Agent pursuant to subsection (c) of this Section, from and after the effective date specified in each Assignment and Assumption, the Eligible Assignee thereunder shall be a party to this Agreement and, to the extent of the interest assigned by such Assignment and Assumption, have the rights and obligations of a Lender under this Agreement, and the assigning Lender thereunder shall, to the extent of the interest assigned by such Assignment and Assumption, be released from its obligations under this Agreement (and, in the case of an Assignment and Assumption covering all of the assigning Lender’s rights and obligations under this Agreement, such Lender shall cease to be a party hereto) but shall continue to be entitled to the benefits of Sections 3.01, 3.04, 3.05, and 10.04 with respect to facts and circumstances occurring prior to the effective date of such assignment. Upon request, the Borrower (at its expense) shall execute and deliver a Note to the assignee Lender. Any assignment or transfer by a Lender of rights or obligations under this Agreement that does not comply with this subsection shall be treated for purposes of this Agreement as a sale by such Lender of a participation in such rights and obligations in accordance with subsection (d) of this Section.

          (c) Register. The Administrative Agent, acting solely for this purpose as an agent of the Borrower, shall maintain at the Administrative Agent’s Office a copy of each Assignment and Assumption delivered to it and a register for the recordation of the names and addresses of the Lenders, and the Commitments of, and principal amounts of the Loans owing to, each Lender pursuant to the terms hereof from time to time (the “Register”). The entries in the Register shall be presumed correct, and the Borrower, the Administrative Agent and the Lenders

may treat each Person whose name is recorded in the Register pursuant to the terms hereof as a Lender hereunder for all purposes of this Agreement, notwithstanding notice to the contrary. The Register shall be available for inspection by the Borrower at any reasonable time and from time to time upon reasonable prior notice. In addition, at any time that a request for a consent for a material or substantive change to the Loan Documents is pending, any Lender wishing to consult with other Lenders in connection therewith may request and receive from the Administrative Agent a copy of the Register.

          (d) Participations. Any Lender may at any time, without the consent of, or notice to, the Borrower or the Administrative Agent, sell participations to any Person (other than a natural person or the Borrower or any of the Borrower’s Affiliates or Subsidiaries) (each, a “Participant”) in all or a portion of such Lender’s rights and/or obligations under this Agreement (including all or a portion of its Commitment and/or the Loans owing to it); provided that (i) such Lender’s obligations under this Agreement shall remain unchanged, (ii) such Lender shall remain solely responsible to the other parties hereto for the performance of such obligations and (iii) the Borrower, the Administrative Agent and the Lenders shall continue to deal solely and directly with such Lender in connection with such Lender’s rights and obligations under this Agreement.

     Any agreement or instrument pursuant to which a Lender sells such a participation shall provide that such Lender shall retain the sole right to enforce this Agreement and to approve any amendment, modification or waiver of any provision of this Agreement; provided that such agreement or instrument may provide that such Lender will not, without the consent of the Participant, agree to any amendment, waiver or other modification described in the first proviso to Section 10.01 that affects such Participant. Subject to subsection (e) of this Section, the Borrower agrees that each Participant shall be entitled to the benefits of Sections 3.01, 3.04 and 3.05 to the same extent as if it were a Lender and had acquired its interest by assignment pursuant to subsection (b) of this Section. To the extent permitted by law, each Participant also shall be entitled to the benefits of Section 10.08 as though it were a Lender, provided such Participant agrees to be subject to Section 2.13 as though it were a Lender.

          (e) Limitations upon Participant Rights. A Participant shall not be entitled to receive any greater payment under Section 3.01 or 3.04 than the applicable Lender would have been entitled to receive with respect to the participation sold to such Participant, unless the sale of the participation to such Participant is made with the Borrower’s prior written consent. A Participant that would be a Foreign Lender if it were a Lender shall not be entitled to the benefits of Section 3.01 unless the Borrower is notified of the participation sold to such Participant and such Participant agrees, for the benefit of the Borrower, to comply with Section 3.01(e) as though it were a Lender.

          (f) Certain Pledges. Any Lender may at any time pledge or assign a security interest in all or any portion of its rights under this Agreement (including under its Note, if any) to secure obligations of such Lender, including any pledge or assignment to secure obligations to a Federal Reserve Bank; provided that no such pledge or assignment shall release such Lender from any of its obligations hereunder or substitute any such pledgee or assignee for such Lender as a party hereto.

          (g) Electronic Execution of Assignments. The words “execution,” “signed,” “signature,” and words of like import in any Assignment and Assumption shall be deemed to include electronic signatures or the keeping of records in electronic form, each of which shall be of the same legal effect, validity or enforceability as a manually executed signature or the use of a paper-based recordkeeping system, as the case may be, to the extent and as provided for in any applicable law, including the Federal Electronic Signatures in Global and National Commerce Act, the New York State Electronic Signatures and Records Act, or any other similar state laws based on the Uniform Electronic Transactions Act.

          (h) Special Purpose Funding Vehicles. Notwithstanding anything to the contrary contained herein, any Lender (a “Granting Lender”) may grant to a special purpose funding vehicle identified as such in writing from time to time by the Granting Lender to the Administrative Agent and the Borrower (an “SPC”) the option to provide all or any part of any Loan that such Granting Lender would otherwise be obligated to make pursuant to this Agreement; provided that (i) nothing herein shall constitute a commitment by any SPC to fund any Loan, and (ii) if an SPC elects not to exercise such option or otherwise fails to make all or any part of such Loan, the Granting Lender shall be obligated to make such Loan pursuant to the terms hereof or, if it fails to do so, to make such payment to the Administrative Agent as is required under Section 2.12(b)(ii). Each party hereto hereby agrees that (i) neither the grant to any SPC nor the exercise by any SPC of such option shall increase the costs or expenses or otherwise increase or change the obligations of the Borrower under this Agreement (including its obligations under Section 3.04), (ii) no SPC shall be liable for any indemnity or similar payment obligation under this Agreement for which a Lender would be liable, and (iii) the Granting Lender shall for all purposes, including the approval of any amendment, waiver or other modification of any provision of any Loan Document, remain the lender of record hereunder. The making of a Loan by an SPC hereunder shall utilize the Commitment of the Granting Lender to the same extent, and as if, such Loan were made by such Granting Lender. In furtherance of the foregoing, each party hereto hereby agrees (which agreement shall survive the termination of this Agreement) that, prior to the date that is one year and one day after the payment in full of all outstanding commercial paper or other senior debt of any SPC, it will not institute against, or join any other Person in instituting against, such SPC any bankruptcy, reorganization, arrangement, insolvency, or liquidation proceeding under the laws of the United States or any State thereof. Notwithstanding anything to the contrary contained herein, any SPC may (i) with notice to, but without prior consent of the Borrower and the Administrative Agent and without paying any processing fee therefor, assign all or any portion of its right to receive payment with respect to any Loan to the Granting Lender and (ii) disclose on a confidential basis any non-public information relating to its funding of Loans to any rating agency, commercial paper dealer or provider of any surety or Guarantee or credit or liquidity enhancement to such SPC.

     10.07 Treatment of Certain Information; Confidentiality.

          (a) Each of the Administrative Agent and the Lenders agrees to maintain the confidentiality of the Information (as defined below), except that Information may be disclosed (i) to its Affiliates and to its and its Affiliates’ respective partners, directors, officers, employees, agents, advisors and representatives (it being understood that the Persons to whom such disclosure is made will be informed of the confidential nature of such Information and instructed to keep such Information confidential), (ii) to the extent requested by any regulatory authority

purporting to have jurisdiction over it (including any self-regulatory authority, such as the National Association of Insurance Commissioners), (iii) to the extent required by applicable laws or regulations or by any subpoena or similar legal process, (iv) to any other party hereto, (v) in connection with the exercise of any remedies hereunder or under any other Loan Document or any action or proceeding relating to this Agreement or any other Loan Document or the enforcement of rights hereunder or thereunder, (vi) subject to an agreement containing provisions substantially the same as those of this Section, to (A) any assignee of or Participant in, or any prospective assignee of or Participant in, any of its rights or obligations under this Agreement or (B) any actual or prospective counterparty (or its advisors) to any swap or derivative transaction relating to the Borrower and its obligations, (vii) with the consent of the Borrower or (viii) to the extent such Information (X) becomes publicly available other than as a result of a breach of this Section or (Y) becomes available to the Administrative Agent, any Lender or any of their respective Affiliates on a nonconfidential basis from a source other than the Borrower.

     For purposes of this Section 10.07(a), “Information” means all information received from the Borrower or any Subsidiary relating to the Borrower or any Subsidiary or any of their respective businesses, other than any such information that is available to the Administrative Agent or any Lender on a nonconfidential basis prior to disclosure by the Borrower or any Subsidiary, provided that, in the case of information received from the Borrower or any Subsidiary after the date hereof, such information is clearly identified at the time of delivery as confidential. Any Person required to maintain the confidentiality of Information as provided in this Section shall be considered to have complied with its obligation to do so if such Person has exercised the same degree of care to maintain the confidentiality of such Information as such Person would accord to its own confidential information.

          (b) The Borrower agrees that the Fee Letter and any commitment letter executed in connection herewith are confidential, and agrees not to disclose any information contained in any such letter except upon the terms therein set forth.

     10.08 Right of Setoff. If an Event of Default shall have occurred and be continuing, each Lender and each of their respective Affiliates is hereby authorized at any time and from time to time, to the fullest extent permitted by applicable law, to set off and apply any and all deposits (general or special, time or demand, provisional or final, in whatever currency) at any time held and other obligations (in whatever currency) at any time owing by such Lender or any such Affiliate to or for the credit or the account of the Borrower or any other Loan Party against any and all of the obligations of the Borrower or such Loan Party now or hereafter existing under this Agreement or any other Loan Document to such Lender, irrespective of whether or not such Lender shall have made any demand under this Agreement or any other Loan Document and although such obligations of the Borrower or such Loan Party may be contingent or unmatured or are owed to a branch or office of such Lender different from the branch or office holding such deposit or obligated on such indebtedness. The rights of each Lender and their respective Affiliates under this Section are in addition to other rights and remedies (including other rights of setoff) that such Lender or their respective Affiliates may have. Each Lender agrees to notify the Borrower and the Administrative Agent promptly after any such setoff and application, provided that the failure to give such notice shall not affect the validity of such setoff and application.

     10.09 Interest Rate Limitation. Notwithstanding anything to the contrary contained in any Loan Document, the interest paid or agreed to be paid under the Loan Documents shall not exceed the maximum rate of non-usurious interest permitted by applicable Law (the “Maximum Rate”). If the Administrative Agent or any Lender shall receive interest in an amount that exceeds the Maximum Rate, the excess interest shall be applied to the principal of the Loans or, if it exceeds such unpaid principal, refunded to the Borrower. In determining whether the interest contracted for, charged, or received by the Administrative Agent or a Lender exceeds the Maximum Rate, such Person may, to the extent permitted by applicable Law, (a) characterize any payment that is not principal as an expense, fee, or premium rather than interest, (b) exclude voluntary prepayments and the effects thereof, and (c) amortize, prorate, allocate, and spread in equal or unequal parts the total amount of interest throughout the contemplated term of the Obligations hereunder.

     To the extent that the interest rate laws of the State of Texas are applicable to the Loans for purposes of determining the “maximum rate” or the “maximum amount,” then those terms mean the “weekly ceiling” from time to time in effect under Texas Finance Code § 303.001, as limited by Texas Finance Code § 303.009, and, to the extent that this Agreement is deemed an open end account as such term is defined in Texas Finance Code Section 301.002(a)(14), the Lenders retain the right to modify the interest rate in accordance with applicable law. The parties agree that Texas Finance Code, Chapter 346, which regulates certain revolving loan accounts and revolving triparty accounts, shall not apply to any revolving loan accounts created under this Agreement or the Notes or maintained in connection therewith.

     10.10 Counterparts; Integration; Effectiveness. This Agreement may be executed in counterparts (and by different parties hereto in different counterparts), each of which shall constitute an original, but all of which when taken together shall constitute a single contract. This Agreement and the other Loan Documents constitute the entire contract among the parties relating to the subject matter hereof and supersede any and all previous agreements and understandings, oral or written, relating to the subject matter hereof. Except as provided in Section 4.01, this Agreement shall become effective when it shall have been executed by the Administrative Agent and when the Administrative Agent shall have received counterparts hereof that, when taken together, bear the signatures of each of the other parties hereto. Delivery of an executed counterpart of a signature page of this Agreement by telecopy shall be effective as delivery of a manually executed counterpart of this Agreement.

     10.11 Survival of Representations and Warranties. All representations and warranties made hereunder and in any other Loan Document or other document delivered pursuant hereto or thereto or in connection herewith or therewith shall survive the execution and delivery hereof and thereof. Such representations and warranties have been or will be relied upon by the Administrative Agent and each Lender, regardless of any investigation made by the Administrative Agent or any Lender or on their behalf and notwithstanding that the Administrative Agent or any Lender may have had notice or knowledge of any Default at the time of any Credit Extension, and shall continue in full force and effect as long as any Loan or any other Obligation hereunder shall remain unpaid or unsatisfied.

     10.12 Severability. If any provision of this Agreement or the other Loan Documents is held to be illegal, invalid or unenforceable, (a) the legality, validity and enforceability of the

remaining provisions of this Agreement and the other Loan Documents shall not be affected or impaired thereby and (b) the parties shall endeavor in good faith negotiations to replace the illegal, invalid or unenforceable provisions with valid provisions the economic effect of which comes as close as possible to that of the illegal, invalid or unenforceable provisions. The invalidity of a provision in a particular jurisdiction shall not invalidate or render unenforceable such provision in any other jurisdiction.

     10.13 Impacted Lenders. (a) If any Lender requests compensation under Section 3.04, or if the Borrower is required to pay any additional amount to any Lender or any Governmental Authority for the account of any Lender pursuant to Section 3.01, or if any Lender is an Impacted Lender, then (y) the Borrower may, upon notice to such Lender and the Administrative Agent, and (z) in the case of an Impacted Lender, the Administrative Agent may, upon notice to such Lender and the Borrower, require such Lender to assign and delegate, without recourse (in accordance with and subject to the restrictions contained in, and consents required by, Section 10.06), all of its interests, rights and obligations under this Agreement and the related Loan Documents to an assignee that shall assume such obligations (which assignee may be another Lender, if a Lender accepts such assignment), provided that:

          (i) other than an assignment required by the Administrative Agent, the Borrower shall have paid to the Administrative Agent the assignment fee specified in Section 10.06(b);

          (ii) such Lender shall have received payment of an amount equal to 100% of the outstanding principal of its Loans, accrued interest thereon, accrued fees and all other amounts payable to it hereunder and under the other Loan Documents (including any amounts under Section 3.05) from the assignee (to the extent of such outstanding principal and accrued interest and fees) or the Borrower (in the case of all other amounts);

          (iii) in the case of any such assignment resulting from a claim for compensation under Section 3.04 or payments required to be made pursuant to Section 3.01, such assignment will result in a reduction in such compensation or payments thereafter; and

          (iv) such assignment does not conflict with applicable Laws.

     A Lender shall not be required to make any such assignment or delegation if, prior thereto, as a result of a waiver by such Lender or otherwise, the circumstances entitling the Borrower or the Administrative Agent to require such assignment and delegation cease to apply. In the event that the Administrative Agent, the Borrower, and the other Lenders each agree that an Impacted Lender has adequately remedied all matters that caused such Lender to be an Impacted Lender and the Impacted Lender has not been removed or replaced, then such Lender shall purchase at par such of the Loans of the other Lenders as the Administrative shall determine may be necessary in order for such Lender to hold such Loans in accordance with its Commitment hereunder.

          (b) If a Lender is an Impacted Lender and upon the prior written consent of the Administrative Agent, and the other Lenders (in each case which consent shall not be unreasonably withheld, conditioned or delayed), then the Borrower shall have the right to remove such Impacted Lender as a party to this Agreement, and the Borrower may, upon notice to such Impacted Lender and the Administrative Agent remove such Impacted Lender by terminating such Impacted Lender’s Commitment. The Borrower shall (i) pay in full all principal, interest, fees and other amounts owing to such Impacted Lender through the date of termination, and (ii) release such Impacted Lender from its obligations under the Loan Documents. The Administrative Agent shall distribute an amended Schedule 2.01, which shall be deemed incorporated into this Agreement, to reflect the removal of the Impacted Lender and termination of its respective Commitment. The removal of an Impacted Lender and the termination of such Lender’s Commitment shall not increase or decrease any other Lender’s Commitment which shall continue in effect notwithstanding such removal of the Impacted Lender.

          (c) Notwithstanding any provision of this Agreement to the contrary, if any Lender becomes an Impacted Lender, then the following provisions shall apply for so long as such Lender is an Impacted Lender: the Commitment of such Impacted Lender shall not be included in determining whether all Lenders or the Required Lenders have taken or may take any action hereunder (including any consent to any amendment or waiver pursuant to Section 10.01 hereof), provided that any waiver, amendment or modification requiring the consent of all Lenders or each affected Lender which affects such Impacted Lender shall require the consent of such Impacted Lender.

     10.14 Governing Law; Jurisdiction; Etc.

          (a) GOVERNING LAW. THIS AGREEMENT SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAW OF THE STATE OF NEW YORK; PROVIDED THAT THE ADMINISTRATIVE AGENT AND EACH LENDER SHALL RETAIN ALL RIGHTS ARISING UNDER APPLICABLE FEDERAL LAW.

          (b) SUBMISSION TO JURISDICTION. THE BORROWER AND EACH OTHER LOAN PARTY IRREVOCABLY AND UNCONDITIONALLY SUBMITS, FOR ITSELF AND ITS PROPERTY, TO THE NONEXCLUSIVE JURISDICTION OF THE COURTS OF THE STATE OF NEW YORK SITTING IN NEW YORK CITY AND OF THE UNITED STATES DISTRICT COURT OF THE SOUTHERN DISTRICT OF NEW YORK, AND ANY APPELLATE COURT FROM ANY THEREOF, IN ANY ACTION OR PROCEEDING ARISING OUT OF OR RELATING TO THIS AGREEMENT OR ANY OTHER LOAN DOCUMENT, OR FOR RECOGNITION OR ENFORCEMENT OF ANY JUDGMENT, AND EACH OF THE PARTIES HERETO IRREVOCABLY AND UNCONDITIONALLY AGREES THAT ALL CLAIMS IN RESPECT OF ANY SUCH ACTION OR PROCEEDING MAY BE HEARD AND DETERMINED IN SUCH TEXAS STATE COURT OR, TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW, IN SUCH FEDERAL COURT. EACH OF THE PARTIES HERETO AGREES THAT A FINAL JUDGMENT IN ANY SUCH ACTION OR PROCEEDING MAY BE ENFORCED IN OTHER JURISDICTIONS BY SUIT ON THE JUDGMENT OR IN ANY OTHER MANNER PROVIDED BY LAW. NOTHING IN THIS AGREEMENT OR IN ANY OTHER LOAN

DOCUMENT SHALL AFFECT ANY RIGHT THAT THE ADMINISTRATIVE AGENT OR ANY LENDER MAY OTHERWISE HAVE TO BRING ANY ACTION OR PROCEEDING RELATING TO THIS AGREEMENT OR ANY OTHER LOAN DOCUMENT AGAINST THE BORROWER OR ANY OTHER LOAN PARTY OR ITS PROPERTIES IN THE COURTS OF ANY JURISDICTION.

          (c) WAIVER OF VENUE. THE BORROWER AND EACH OTHER LOAN PARTY IRREVOCABLY AND UNCONDITIONALLY WAIVES, TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW, ANY OBJECTION THAT IT MAY NOW OR HEREAFTER HAVE TO THE LAYING OF VENUE OF ANY ACTION OR PROCEEDING ARISING OUT OF OR RELATING TO THIS AGREEMENT OR ANY OTHER LOAN DOCUMENT IN ANY COURT REFERRED TO IN PARAGRAPH (B) OF THIS SECTION. EACH OF THE PARTIES HERETO HEREBY IRREVOCABLY WAIVES, TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW, THE DEFENSE OF AN INCONVENIENT FORUM TO THE MAINTENANCE OF SUCH ACTION OR PROCEEDING IN ANY SUCH COURT.

          (d) SERVICE OF PROCESS. EACH PARTY HERETO IRREVOCABLY CONSENTS TO SERVICE OF PROCESS IN THE MANNER PROVIDED FOR NOTICES IN SECTION 10.02. NOTHING IN THIS AGREEMENT WILL AFFECT THE RIGHT OF ANY PARTY HERETO TO SERVE PROCESS IN ANY OTHER MANNER PERMITTED BY APPLICABLE LAW.

     10.15 Waiver of Jury Trial. EACH PARTY HERETO HEREBY IRREVOCABLY WAIVES, TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW, ANY RIGHT IT MAY HAVE TO A TRIAL BY JURY IN ANY LEGAL PROCEEDING DIRECTLY OR INDIRECTLY ARISING OUT OF OR RELATING TO THIS AGREEMENT OR ANY OTHER LOAN DOCUMENT OR THE TRANSACTIONS CONTEMPLATED HEREBY OR THEREBY (WHETHER BASED ON CONTRACT, TORT OR ANY OTHER THEORY). EACH PARTY HERETO (A) CERTIFIES THAT NO REPRESENTATIVE, AGENT OR ATTORNEY OF ANY OTHER PERSON HAS REPRESENTED, EXPRESSLY OR OTHERWISE, THAT SUCH OTHER PERSON WOULD NOT, IN THE EVENT OF LITIGATION, SEEK TO ENFORCE THE FOREGOING WAIVER AND (B) ACKNOWLEDGES THAT IT AND THE OTHER PARTIES HERETO HAVE BEEN INDUCED TO ENTER INTO THIS AGREEMENT AND THE OTHER LOAN DOCUMENTS BY, AMONG OTHER THINGS, THE MUTUAL WAIVERS AND CERTIFICATIONS IN THIS SECTION.

     10.16 USA PATRIOT Act Notice. Each Lender that is subject to the Act (as hereinafter defined) and the Administrative Agent (for itself and not on behalf of any Lender) hereby notifies the Borrower that pursuant to the requirements of the USA Patriot Act (Title III of Pub. L. 107-56 (signed into law October 26, 2001)) (the “Act”), it is required to obtain, verify and record information that identifies the Borrower, which information includes the name and address of the Borrower and other information that will allow such Lender or the Administrative Agent, as applicable, to identify the Borrower in accordance with the Act.

     10.17 ENTIRE AGREEMENT. THIS WRITTEN AGREEMENT AND THE OTHER LOAN DOCUMENTS REPRESENT THE FINAL AGREEMENT AMONG THE PARTIES AND MAY NOT BE CONTRADICTED BY EVIDENCE OF PRIOR, CONTEMPORANEOUS, OR SUBSEQUENT ORAL AGREEMENTS OF THE PARTIES. THERE ARE NO UNWRITTEN ORAL AGREEMENTS AMONG THE PARTIES.

     IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be duly executed as of the date first above written.

Signature Page to Credit Agreement
(Patterson – UTI Energy, Inc.)

Signature Page to Credit Agreement
(Patterson – UTI Energy, Inc.)

SCHEDULE 2.01

COMMITMENTS

AND APPLICABLE PERCENTAGES

Lender		Commitment				Applicable Percentage
Wells Fargo Bank, N.A.		$	250,000,000				100	%
Total		$	250,000,000				100.00000	%

SCHEDULE 5.13

SUBSIDIARIES AND OTHER EQUITY INVESTMENTS

Part (a). Subsidiaries

						State of
		Percent Owned				Incorporation
Name		by Borrower				or Organization
Ambar Lone Star Fluids Services LLC			100	%		Texas
Patterson Petroleum LLC			100	%		Texas
Patterson-UTI Drilling Canada Limited			100	%		Nova Scotia
Patterson-UTI Drilling Company LLC			100	%		Texas
Patterson-UTI Drilling International, Inc.			100	%		Delaware
Patterson-UTI Management Services, LLC			100	%		Delaware
Portofino Acquisition Company			100	%		Delaware
Universal Well Services, Inc.			100	%		Delaware

Part (b) Equity Investments in Other Entities

		Number of Interests
Entity		Held		Description of Interests
Arrow Construction, Inc.		5		Shares of Common Stock
ECOMM Security Inc.		93,478		Shares of Preferred Series A
EPL Acquisition Corp.		28,820		Shares of Common Stock
Essential Security Software, Inc.		100,000		Shares of Common Stock
Futurelink Corp.		2,272		Shares of Common Stock
Giant Studios Inc.		6,667		Shares of Preferred Convertible Series A
GOIP Global, Inc.		87		Shares of Common Stock
Loral Space & Communications LTD		2,400		Shares of Preferred Convertible Series C
Miscor Group Ltd.		29,000		Shares of Common Stock
NYPPE Holdings LLC		72,000		Shares of Preferred Class A
RAK Partners II Qualified Purchaser Fund, L.P.		N/A		$100,000 limited partnership interest
Scorpion Capital Partners, L.P.		N/A		$250,000 limited partnership interest
Streamcenter Inc.		10,000		Shares of Series B Redeemable Convertible Preferred
Walker Financial Corp.		6,774,800		Shares of Common Stock
Mediavest, Inc.		167		Shares of Common Stock
Network International, Inc.		125,000		Shares of Common Stock

SCHEDULE 7.01

Certain Existing Liens

Filing Number		Date Filed		Debtor(s)		Secured Party		Type of Filing		Description of Collateral
07-0025091296		7/25/2007		Patterson-UTI Energy, Inc. and Patterson-UTI Drilling Company LLC (as assumed name)		Lubbock National Bank Lubbock, TX		Financing Statement		WorkCentre copier leased by DivLend Equipment Leasing L.L.C.
83270631		7/3/2008		Universal Well Services, Inc.		Cisco Systems Capital Corporation Wayne, PA		Financing Statement		Various Cisco IT, server and internet components
82887543		8/25/2008		Patterson-UTI Energy, Inc.		Xerox Corporation Lewisville, TX		Financing Statement		Five Xerox copiers
09-0005992054		3/3/2009		Patterson-UTI Drilling Company LLC		Holt Cat San Antonio, TX		Financing Statement		One Caterpillar Model 3512 engine complete with all substitutions, replacements, additions, attachments and/or accessories thereto
09-0006011198		3/3/2009		Patterson-UTI Drilling Company LLC		Holt Cat San Antonio, TX		Financing Statement		One Caterpillar Model 3512 engine complete with all substitutions, replacements, additions, attachments and/or accessories thereto
09-0006012220		3/3/2009		Patterson-UTI Drilling Company LLC		Holt Cat San Antonio, TX		Financing Statement		One Caterpillar Model 3512 engine complete with all substitutions, replacements, additions, attachments and/or accessories thereto
09-0010920788		4/17/2009		Patterson-UTI Drilling Company LLC		Holt Cat San Antonio, TX		Financing Statement		One Caterpillar Model 3512 engine complete with all substitutions, replacements, additions, attachments and/or accessories thereto
09-0010922720		4/17/2009		Patterson-UTI Drilling Company LLC		Holt Cat San Antonio, TX		Financing Statement		One Caterpillar Model 3512 engine complete with all substitutions, replacements, additions, attachments and/or accessories thereto
09-0010922942		4/17/2009		Patterson-UTI Drilling Company LLC		Holt Cat San Antonio, TX		Financing Statement		One Caterpillar Model 3512 engine complete with all substitutions, replacements, additions, attachments and/or accessories thereto
09-0011302137		4/21/2009		Patterson-UTI Drilling Company LLC		Holt Cat San Antonio, TX		Financing Statement		One Caterpillar Model 3512 engine complete with all substitutions, replacements, additions, attachments and/or accessories thereto

Schedule 7.01

Filing Number		Date Filed		Debtor(s)		Secured Party		Type of Filing		Description of Collateral
09-0011304624		4/21/2009		Patterson-UTI Drilling Company LLC		Holt Cat San Antonio, TX		Financing Statement		One Caterpillar Model 3512 engine complete with all substitutions, replacements, additions, attachments and/or accessories thereto
09-0011306222		4/21/2009		Patterson-UTI Drilling Company LLC		Holt Cat San Antonio, TX		Financing Statement		One Caterpillar Model 3512 engine complete with all substitutions, replacements, additions, attachments and/or accessories thereto
09-0012305212		4/30/2009		Patterson-UTI Drilling Company LLC		Holt Cat San Antonio, TX		Financing Statement		One Caterpillar Model 3512 engine complete with all substitutions, replacements, additions, attachments and/or accessories thereto
09-0012307365		4/30/2009		Patterson-UTI Drilling Company LLC		Holt Cat San Antonio, TX		Financing Statement		One Caterpillar Model 3512 engine complete with all substitutions, replacements, additions, attachments and/or accessories thereto
09-0012307587		4/30/2009		Patterson-UTI Drilling Company LLC		Holt Cat San Antonio, TX		Financing Statement		One Caterpillar Model 3512 engine complete with all substitutions, replacements, additions, attachments and/or accessories thereto
09-0016579805		6/11/2009		Patterson-UTI Drilling Company LLC		Holt Cat San Antonio, TX		Financing Statement		One Caterpillar Model 3512 engine complete with all substitutions, replacements, additions, attachments and/or accessories thereto
09-0016581292		6/11/2009		Patterson-UTI Drilling Company LLC		Holt Cat San Antonio, TX		Financing Statement		One Caterpillar Model 3512 engine complete with all substitutions, replacements, additions, attachments and/or accessories thereto
09-0016582435		6/11/2009		Patterson-UTI Drilling Company LLC		Holt Cat San Antonio, TX		Financing Statement		One Caterpillar Model 3512 engine complete with all substitutions, replacements, additions, attachments and/or accessories thereto
09-0016898536		6/15/2009		Patterson-UTI Drilling Company LLC		Holt Cat San Antonio, TX		Financing Statement		One Caterpillar Model 3512 engine complete with all substitutions, replacements, additions, attachments and/or accessories thereto
09-006900055		6/15/2009		Patterson-UTI Drilling Company LLC		Holt Cat San Antonio, TX		Financing Statement		One Caterpillar Model 3512 engine complete with all substitutions, replacements, additions, attachments and/or accessories thereto
09-0016901632		6/15/2009		Patterson-UTI Drilling Company LLC		Holt Cat San Antonio, TX		Financing Statement		One Caterpillar Model 3512 engine complete with all substitutions, replacements, additions, attachments and/or accessories thereto

Schedule 7.01

Filing Number		Date Filed		Debtor(s)		Secured Party		Type of Filing		Description of Collateral
09-0016904140		6/15/2009		Patterson-UTI Drilling Company LLC		Holt Cat San Antonio, TX		Financing Statement		One Caterpillar Model 3512 engine complete with all substitutions, replacements, additions, attachments and/or accessories thereto
09-0016906526		6/15/2009		Patterson-UTI Drilling Company LLC		Holt Cat San Antonio, TX		Financing Statement		One Caterpillar Model 3512 engine complete with all substitutions, replacements, additions, attachments and/or accessories thereto
09-0016907214		6/15/2009		Patterson-UTI Drilling Company LLC		Holt Cat San Antonio, TX		Financing Statement		One Caterpillar Model 3512 engine complete with all substitutions, replacements, additions, attachments and/or accessories thereto
09-0018116157		6/26/2009		Patterson-UTI Drilling Company LLC		Holt Cat San Antonio, TX		Financing Statement		One Caterpillar Model 3512 engine complete with all substitutions, replacements, additions, attachments and/or accessories thereto
09-0018116935		6/26/2009		Patterson-UTI Drilling Company LLC		Holt Cat San Antonio, TX		Financing Statement		One Caterpillar Model 3512 engine complete with all substitutions, replacements, additions, attachments and/or accessories thereto
09-0018123549		6/26/2009		Patterson-UTI Drilling Company LLC		Holt Cat San Antonio, TX		Financing Statement		One Caterpillar Model 3512 engine complete with all substitutions, replacements, additions, attachments and/or accessories thereto
09-0018130597		6/26/2009		Patterson-UTI Drilling Company LLC		Holt Cat San Antonio, TX		Financing Statement		One Caterpillar Model 3512 engine complete with all substitutions, replacements, additions, attachments and/or accessories thereto
09-0018130931		6/26/2009		Patterson-UTI Drilling Company LLC		Holt Cat San Antonio, TX		Financing Statement		One Caterpillar Model 3512 engine complete with all substitutions, replacements, additions, attachments and/or accessories thereto
09-0018131629		6/26/2009		Patterson-UTI Drilling Company LLC		Holt Cat San Antonio, TX		Financing Statement		One Caterpillar Model 3512 engine complete with all substitutions, replacements, additions, attachments and/or accessories thereto
09-0020806015		7/23/2009		Patterson-UTI Drilling Company LLC		Holt Cat San Antonio, TX		Financing Statement		One Caterpillar Model 3512 engine complete with all substitutions, replacements, additions, attachments and/or accessories thereto
09-0020828746		7/23/2009		Patterson-UTI Drilling Company LLC		Holt Cat San Antonio, TX		Financing Statement		One Caterpillar Model 3512 engine complete with all substitutions, replacements, additions, attachments and/or accessories thereto

Schedule 7.01

Filing Number		Date Filed		Debtor(s)		Secured Party		Type of Filing		Description of Collateral
09-0020829434		7/23/2009		Patterson-UTI Drilling Company LLC		Holt Cat San Antonio, TX		Financing Statement		One Caterpillar Model 3512 engine complete with all substitutions, replacements, additions, attachments and/or accessories thereto
09-0021224080		7/28/2009		Patterson-UTI Drilling Company LLC		Holt Cat San Antonio, TX		Financing Statement		One Caterpillar Model 3512 engine complete with all substitutions, replacements, additions, attachments and/or accessories thereto
09-0021226800		7/28/2009		Patterson-UTI Drilling Company LLC		Holt Cat San Antonio, TX		Financing Statement		One Caterpillar Model 3512 engine complete with all substitutions, replacements, additions, attachments and/or accessories thereto
09-0021229752		7/28/2009		Patterson-UTI Drilling Company LLC		Holt Cat San Antonio, TX		Financing Statement		One Caterpillar Model 3512 engine complete with all substitutions, replacements, additions, attachments and/or accessories thereto
09-0025750967		9/14/2009		Patterson-UTI Drilling Company LLC		Holt Cat San Antonio, TX		Financing Statement		One Caterpillar Model 3512 engine complete with all substitutions, replacements, additions, attachments and/or accessories thereto
93988604		12/14/2009		Universal Well Services, Inc.		Kemper Valve & Fittings Corp. Wauconda, IL		Financing Statement		All goods manufactured by Kemper Valve & Fittings Corp. and delivered to or in possession of Universal Well Services, Inc., including, without limitation certain valves, unions and fittings.
10-00004508028		2/16/2010		Patterson-UTI Drilling Company LLC		Holt Cat San Antonio, TX		Financing Statement		Three Caterpillar Model 3512 engines complete with all substitutions, replacements, additions, attachments and/or accessories thereto
10-00004511214		2/16/2010		Patterson-UTI Drilling Company LLC		Holt Cat San Antonio, TX		Financing Statement		Three Caterpillar Model 3512 engines complete with all substitutions, replacements, additions, attachments and/or accessories thereto
10-0009968841		4/8/2010		Patterson-UTI Drilling Company LLC		Associated Supply Company, Inc. Lubbock, TX		Financing Statement		One 2008 Model Link Belt 30 Ton Rough Terrain Crane and one 2003 Model Link Belt 50 Ton Rough Terrain Crane

Schedule 7.01

Filing Number		Date Filed		Debtor(s)		Secured Party		Type of Filing		Description of Collateral
10-0014553342		5/20/210		Patterson-UTI Drilling Company LLC		Holt Cat San Antonio, TX		Financing Statement		Three Caterpillar Model 3512 engines complete with all substitutions, replacements, additions, attachments and/or accessories thereto
10-0017752811		6/21/2010		Patterson-UTI Drilling Company LLC		Holt Cat San Antonio, TX		Financing Statement		One 10 diesel package genset model with all substitutions, replacements, additions, attachments and/or accessories thereto

Schedule 7.01

SCHEDULE 10.02

ADDRESSES FOR NOTICES TO COMPANY, GUARANTORS
AND ADMINISTRATIVE AGENT

BORROWER

Patterson-UTI Energy, Inc.
450 Gears Road, Suite 500
Houston, Texas 77067
Attention: Chief Financial Officer
Telephone: (281)  ###-###-####
Facsimile: (281)  ###-###-####

GUARANTORS

Patterson Petroleum LLC
c/o Patterson-UTI Energy, Inc.
450 Gears Road, Suite 500
Houston, Texas 77067
Attention: Chief Financial Officer
Telephone: (281)  ###-###-####
Facsimile: (281)  ###-###-####

Patterson-UTI Drilling Company LLC
c/o Patterson-UTI Energy, Inc.
450 Gears Road, Suite 500
Houston, Texas 77067
Attention: Chief Financial Officer
Telephone: (281)  ###-###-####
Facsimile: (281)  ###-###-####

Patterson-UTI Drilling International, Inc.
c/o Patterson-UTI Energy, Inc.
450 Gears Road, Suite 500
Houston, Texas 77067
Attention: Chief Financial Officer
Telephone: (281)  ###-###-####
Facsimile: (281)  ###-###-####

Patterson-UTI Management Services, LLC
c/o Patterson-UTI Energy, Inc.
450 Gears Road, Suite 500
Houston, Texas 77067
Attention: Chief Financial Officer
Telephone: (281)  ###-###-####
Facsimile: (281)  ###-###-####

Schedule 10.02

Universal Well Services, Inc.
c/o Patterson-UTI Energy, Inc.
450 Gears Road, Suite 500
Houston, Texas 77067
Attention: Chief Financial Officer
Telephone: (281)  ###-###-####
Facsimile: (281)  ###-###-####

WELLS FARGO BANK, N.A., as Administrative Agent

Address for Notices:

Wells Fargo Bank, N.A.
1740 Broadway, MAC C7300-034
Denver, CO 80209
Attention: Agency Syndication
Telephone: (303)  ###-###-####
Facsimile: (303)  ###-###-####
Email:

With a copy to:

Wells Fargo Bank, N.A.
1000 Louisiana, 9th Floor
MAC T5002-090
Houston, Texas 77002
Attention: Brad Ellis, Vice President
Telephone: (713)  ###-###-####
Facsimile: (713)  ###-###-####
Email:

Administrative Agent’s Payment office:

Wells Fargo Bank, N.A.
ABA No.: 121000248
Acct. No.: 0296950720
Ref: Patterson-UTI Energy, Inc.

Wells Fargo Bank, N.A.
1740 Broadway, MAC C7300-034
Denver, CO 80209
Attention: Agency Syndication
Telephone: (303)  ###-###-####
Facsimile: (303)  ###-###-####
Email:

     Schedule 10.02

EXHIBIT A

FORM OF LOAN NOTICE

Date:                                ,              

To: Wells Fargo Bank, N.A., as Administrative Agent

Ladies and Gentlemen:

     Reference is made to that certain Credit Agreement, dated as of July 2, 2010 (as amended, restated, extended, supplemented or otherwise modified in writing from time to time, the “Agreement;” the terms defined therein being used herein as therein defined), among Patterson-UTI Energy, Inc., a Delaware corporation (the “Borrower”), the Lenders from time to time party thereto, and Wells Fargo Bank, N.A., as Administrative Agent.

     The undersigned hereby requests (select one):

     o a Borrowing o a conversion of Loans o a continuation of Eurodollar Rate Loans

	1.		On                                                                                   (a Business Day).
	2.		In the amount of $                                         .
	3.		Comprised of                                         .

                                       [Type of Loan requested]

4.

For Eurodollar Rate Loans: with an Interest Period of                      months.

     The Borrowing, if any, requested herein complies with the proviso to the first sentence of Section 2.01 of the Agreement.

Exhibit A

EXHIBIT B

FORM OF NOTE

                                        , 2010

     FOR VALUE RECEIVED, the undersigned (the “Borrower”) hereby promises to pay to                                          or permitted and registered assigns (the “Lender”), in accordance with the provisions of the Agreement (as hereinafter defined), the principal amount of each Loan from time to time made by the Lender to the Borrower under that certain Credit Agreement dated as of July 2, 2010 (as amended, restated, extended, supplemented or otherwise modified in writing from time to time, the “Agreement;” the terms defined therein being used herein as therein defined), among the Borrower, the Lenders from time to time party thereto, and Wells Fargo Bank, N.A., as Administrative Agent.

     The Borrower promises to pay interest on the unpaid principal amount of each Loan from the date of such Loan until such principal amount is paid in full, at such interest rates and at such times as provided in the Agreement. All payments of principal and interest shall be made to the Administrative Agent for the account of the Lender in Dollars in immediately available funds at the Administrative Agent’s Office. If any amount is not paid in full when due hereunder, such unpaid amount shall bear interest, to be paid upon demand, from the due date thereof until the date of actual payment (and before as well as after judgment) computed at the per annum rate set forth in the Agreement.

     This Note is one of the Notes referred to in the Agreement, is entitled to the benefits thereof and may be prepaid in whole or in part subject to the terms and conditions provided therein. This Note is also entitled to the benefits of the Guaranty. Upon the occurrence and continuation of one or more of the Events of Default specified in the Agreement, all amounts then remaining unpaid on this Note shall become, or may be declared to be, immediately due and payable all as provided in the Agreement. Loans made by the Lender shall be evidenced by one or more loan accounts or records maintained by the Lender and by the Administrative Agent in the ordinary course of business. The Lender may also attach schedules to this Note and endorse thereon the date, Type, amount and maturity of its Loans and payments with respect thereto.

     The Borrower, for itself, its successors and assigns, hereby waives diligence, presentment, protest and demand and notice of protest, notice of intent to accelerate, notice of acceleration, demand, dishonor and non-payment of this Note.

     The terms of Section 10.09 of the Credit Agreement are incorporated herein as fully as if set forth herein.

Exhibit B

     THIS NOTE SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK; PROVIDED THAT EACH OF THE ADMINISTRATIVE AGENT AND THE LENDER SHALL RETAIN ALL RIGHTS ARISING UNDER APPLICABLE FEDERAL LAW.

     THIS NOTE AND THE OTHER LOAN DOCUMENTS REPRESENT THE FINAL AGREEMENT AMONG THE PARTIES AND MAY NOT BE CONTRADICTED BY EVIDENCE OF PRIOR, CONTEMPORANEOUS, OR SUBSEQUENT ORAL AGREEMENTS OF THE PARTIES. THERE ARE NO UNWRITTEN ORAL AGREEMENTS AMONG THE PARTIES.

Exhibit B

Loans and Payments with respect thereto

Amount of Principal

Outstanding

End of Interest

or Interest Paid

Principal Balance

Date

Type of Loan Made

Amount of Loan Made

Period

This Date

This Date

Notation Made By

     Exhibit B

EXHIBIT C

FORM OF COMPLIANCE CERTIFICATE

Financial Statement Date:                                          

To: Wells Fargo Bank, N.A., as Administrative Agent

Ladies and Gentlemen:

     Reference is made to that certain Credit Agreement dated as of July 2, 2010 (as amended, restated, extended, supplemented or otherwise modified in writing from time to time, the “Agreement;” the terms defined therein being used herein as therein defined), among Patterson-UTI Energy, Inc., a Delaware corporation (the “Borrower”), the Lenders from time to time party thereto, and Wells Fargo Bank, N.A., as Administrative Agent.

     The undersigned Responsible Officer hereby certifies as of the date hereof that he/she is the                                                               of the Borrower, and that, as such, he/she is authorized to execute and deliver this Certificate to the Administrative Agent on the behalf of the Borrower, and that:

[Use following paragraph 1 for fiscal year-end financial statements]

     1. [Attached hereto are] or [The Borrower has submitted or is submitting on this date pursuant to Section 6.01(a) of the Agreement the following:] the year-end audited financial statements required by Section 6.01(a) of the Agreement for the fiscal year of the Borrower ended as of the above date and the report and opinion of an independent certified public accountant required by such section.

[Use following paragraph 1 for fiscal quarter-end financial statements]

     1. [Attached hereto are] or [The Borrower has submitted or is submitting on this date pursuant to Section 6.01(b) of the Agreement the following:] the unaudited financial statements required by Section 6.01(b) of the Agreement for the fiscal quarter of the Borrower ended as of the above date. Such financial statements fairly present the financial condition, results of operations, shareholders’ equity and cash flows of the Borrower and its Subsidiaries in accordance with GAAP as at such date and for such period, subject only to normal year-end audit adjustments and the absence of footnotes.

     2. The undersigned has reviewed and is familiar with the terms of the Agreement and has made, or has caused to be made under his/her supervision, a detailed review of the transactions and condition (financial or otherwise) of the Borrower during the accounting period covered by the attached financial statements.

Exhibit C

     3. A review of the activities of the Borrower during such fiscal period has been made under the supervision of the undersigned with a view to determining whether during such fiscal period the Borrower performed and observed all its Obligations under the Loan Documents, and

[select one:]

[to the best knowledge of the undersigned during such fiscal period, the Borrower performed and observed each covenant and condition of the Loan Documents applicable to it.]

—or—

[the following covenants or conditions have not been performed or observed and the following is a list of each such Default and its nature and status:]

     4. The representations and warranties of the Borrower contained in Article V of the Agreement, and any representations and warranties of any Loan Party that are contained in any document furnished at any time under or in connection with the Loan Documents, are true and correct on and as of the date hereof, except to the extent that such representations and warranties specifically refer to an earlier date, in which case they are true and correct as of such earlier date, and except that for purposes of this Compliance Certificate, the representations and warranties contained in subsections (a) and (b) of Section 5.05 of the Agreement shall be deemed to refer to the most recent statements furnished pursuant to clauses (a) and (b), respectively, of Section 6.01 of the Agreement, including the statements in connection with which this Compliance Certificate is delivered, [except as follows:                     ].

     5. The financial covenant analyses and information set forth on Schedule 1 attached hereto are true and accurate on and as of the date of this Certificate.

     6. Each Domestic Subsidiary (excluding Immaterial Subsidiaries) existing as of the date of this Certificate has executed and delivered to the Administrative Agent a Guaranty (or such other document as the Administrative Agent has requested to cause such Domestic Subsidiary to become a Guarantor), and such other documents as are required by Section 6.12 of the Agreement.

Exhibit C

     IN WITNESS WHEREOF, the undersigned has executed this Certificate as of                                         .

Exhibit C

For the Quarter/Year ended                                            (“Statement Date”)

SCHEDULE 1
to the Compliance Certificate
($ in 000’s)

I. Section 7.10(a) —Debt to Capitalization Ratio.

A. Consolidated Funded Indebtedness:
1. Obligations for borrowed money:		$
2. Reimbursement obligations arising under letters of credit, bankers’ acceptances, bank guaranties, surety bonds, and similar instruments:		$
3. Obligations to pay deferred purchase price of property or services (other than trade accounts payable to a Person (i) in the United States or Canada, if not past due for more than 60 days or (ii) in any other country, if not past due for more than 120 days):		$
4. Indebtedness secured by a Lien on property owned or being purchased by the Borrower or its Subsidiaries:		$
5. Capital leases:		$
6. Obligations in respect of any forward sale of production for which payment is received in advance, other than on ordinary trade terms:		$
7. Obligations to purchase, redeem, or otherwise make any payment in respect of any Equity Interest, on a date certain and not subject to any contingencies, or at the option of the holder of such Equity Interest:		$
8. Guaranty obligations in respect of the foregoing:		$
9. Consolidated Funded Indebtedness (the sum of I.A.1 through I.A.8):		$
B. Total Capital
1. Consolidated Funded Indebtedness (I.A.9):		$
2. Consolidated Net Worth:		$
3. Total Capital (I.B.1 + I.B.2):		$
C. Debt to Capitalization Ratio ((I.A.9 ÷ I.B.3) x 100):				%

Schedule 1 to Exhibit C

Maximum allowed:
At any time before the existence of the Permanent Credit Facility:			35	%
After a Permanent Credit Facility exists, the lesser of (i) the Debt to Capitalization Ratio as set forth in such Permanent Credit Facility and (ii) 45%:			[45]	%

II. Section 7.10(b) — Interest Coverage Ratio.

A. Consolidated EBITDA for four consecutive fiscal quarters ending on above date (“Subject Period”):
1. Consolidated Net Income for Subject Period:		$
2. Consolidated Interest Charges for Subject Period:		$
3. Income taxes for Subject Period (including state franchise taxes based on income or similar taxes based on income):		$
4. Depreciation expenses for Subject Period:		$
5. Depletion expenses for Subject Period:		$
6. Amortization expenses for Subject Period:		$
7. Non-cash reductions of Consolidated Net Income for Subject Period:		$
8. Non-cash additions to Consolidated Net Income for Subject Period:		$
9. Consolidated EBITDA (II.A.1 + II.A.2 + II.A.3 + II.A.4 + II.A.5 + II.A.6 + II.A.7 — II.A.8):		$
B. Consolidated Interest Charges for Subject Period:
1. Interest, premium payments, debt discount, fees, charges and related expenses in connection with borrowed money or in connection with the deferred purchase price of assets:		$
2. Rent expenses under capital leases treated as interest in accordance with GAAP:		$
3. Consolidated Interest Charges (II.B.1 + II.B.2):		$
C. Interest Coverage Ratio (II.A.9 ÷ II.B.3):		to 1
Minimum required:		3.00 to 1

Schedule 1 to Exhibit C

EXHIBIT D

FORM OF ASSIGNMENT AND ASSUMPTION

     This Assignment and Assumption (this “Assignment and Assumption”) is dated as of the Effective Date set forth below and is entered into by and between [Insert name of Assignor] (the “Assignor”) and [Insert name of Assignee] (the “Assignee”). Capitalized terms used but not defined herein shall have the meanings given to them in the Credit Agreement identified below (the “Credit Agreement”), receipt of a copy of which is hereby acknowledged by the Assignee. The Standard Terms and Conditions set forth in Annex 1 attached hereto are hereby agreed to and incorporated herein by reference and made a part of this Assignment and Assumption as if set forth herein in full.

     For an agreed consideration, the Assignor hereby irrevocably sells and assigns to the Assignee, and the Assignee hereby irrevocably purchases and assumes from the Assignor, subject to and in accordance with the Standard Terms and Conditions and the Credit Agreement, as of the Effective Date inserted by the Administrative Agent as contemplated below (i) all of the Assignor’s rights and obligations as a Lender under the Credit Agreement and any other documents or instruments delivered pursuant thereto to the extent related to the amount and percentage interest identified below of all of such outstanding rights and obligations of the Assignor under the respective facilities identified below and (ii) to the extent permitted to be assigned under applicable law, all claims, suits, causes of action and any other right of the Assignor (in its capacity as a Lender) against any Person, whether known or unknown, arising under or in connection with the Credit Agreement, any other documents or instruments delivered pursuant thereto or the loan transactions governed thereby or in any way based on or related to any of the foregoing, including, but not limited to, contract claims, tort claims, malpractice claims, statutory claims and all other claims at law or in equity related to the rights and obligations sold and assigned pursuant to clause (i) above (the rights and obligations sold and assigned pursuant to clauses (i) and (ii) above being referred to herein collectively as, the “Assigned Interest”). Such sale and assignment is without recourse to the Assignor and, except as expressly provided in this Assignment and Assumption, without representation or warranty by the Assignor.

1.		Assignor:
2.		Assignee:                                          [and is an [Affiliate of [identify Lender]]
3.		Borrower(s): Patterson-UTI Energy, Inc., a Delaware corporation
4.		Administrative Agent: Wells Fargo Bank, N.A., as the administrative agent under the Credit Agreement
5.		Credit Agreement: Credit Agreement dated as of July 2, 2010, among Patterson-UTI Energy, Inc., the Lenders from time to time party thereto, and Wells Fargo Bank, N.A., as Administrative Agent
6.		Assigned Interest:

Exhibit D

Aggregate
Amount of		Amount of		Percentage
Commitment		Commitment		Assigned of
for all Lenders		Assigned1		Commitment2		CUSIP Number
$		$			%

[7. Trade Date:                                         ]³

     Effective Date:                                         , 20___ [TO BE INSERTED BY ADMINISTRATIVE AGENT AND WHICH SHALL BE THE EFFECTIVE DATE OF RECORDATION OF TRANSFER IN THE REGISTER THEREFOR.]

     The terms set forth in this Assignment and Assumption are hereby agreed to:

Exhibit D

Exhibit D

ANNEX 1 TO ASSIGNMENT AND ASSUMPTION

STANDARD TERMS AND CONDITIONS FOR
ASSIGNMENT AND ASSUMPTION

     1. Representations and Warranties.

          1.1 Assignor. The Assignor (a) represents and warrants that (i) it is the legal and beneficial owner of the Assigned Interest, (ii) the Assigned Interest is free and clear of any lien, encumbrance or other adverse claim and (iii) it has full power and authority, and has taken all action necessary, to execute and deliver this Assignment and Assumption and to consummate the transactions contemplated hereby; and (b) assumes no responsibility with respect to (i) any statements, warranties or representations made in or in connection with the Credit Agreement or any other Loan Document, (ii) the execution, legality, validity, enforceability, genuineness, sufficiency or value of the Loan Documents or any collateral thereunder, (iii) the financial condition of the Borrower, any of its Subsidiaries or Affiliates or any other Person obligated in respect of any Loan Document or (iv) the performance or observance by the Borrower, any of its Subsidiaries or Affiliates or any other Person of any of their respective obligations under any Loan Document.

          1.2 Assignee. The Assignee (a) represents and warrants that (i) it has full power and authority, and has taken all action necessary, to execute and deliver this Assignment and Assumption and to consummate the transactions contemplated hereby and to become a Lender under the Credit Agreement, (ii) it meets all requirements of an Eligible Assignee under the Credit Agreement (subject to receipt of such consents as may be required under the Credit Agreement), (iii) from and after the Effective Date, it shall be bound by the provisions of the Credit Agreement as a Lender thereunder and, to the extent of the Assigned Interest, shall have the obligations of a Lender thereunder, (iv) it has received a copy of the Credit Agreement, together with copies of the most recent financial statements delivered pursuant to Section 6.01 thereof, as applicable, and such other documents and information as it has deemed appropriate to make its own credit analysis and decision to enter into this Assignment and Assumption and to purchase the Assigned Interest on the basis of which it has made such analysis and decision independently and without reliance on the Administrative Agent or any other Lender, and (v) if it is a Foreign Lender, attached hereto is any documentation required to be delivered by it pursuant to the terms of the Credit Agreement, duly completed and executed by the Assignee; and (b) agrees that (i) it will, independently and without reliance on the Administrative Agent, the Assignor or any other Lender, and based on such documents and information as it shall deem appropriate at the time, continue to make its own credit decisions in taking or not taking action under the Loan Documents, and (ii) it will perform in accordance with their terms all of the obligations which by the terms of the Loan Documents are required to be performed by it as a Lender.

     2. Payments. From and after the Effective Date, the Administrative Agent shall make all payments in respect of the Assigned Interest (including payments of principal, interest, fees and other amounts) to the Assignor for amounts which have accrued to but excluding the

Annex 1 to Assignment and Assumption

Effective Date and to the Assignee for amounts which have accrued from and after the Effective Date.

          3. General Provisions. This Assignment and Assumption shall be binding upon, and inure to the benefit of, the parties hereto and their respective successors and assigns. This Assignment and Assumption may be executed in any number of counterparts, which together shall constitute one instrument. Delivery of an executed counterpart of a signature page of this Assignment and Assumption by telecopy shall be effective as delivery of a manually executed counterpart of this Assignment and Assumption. This Assignment and Assumption shall be governed by, and construed in accordance with, the law of the State of New York.

Annex 1 to Assignment and Assumption

EXHIBIT E

FORM OF CONTINUING GUARANTY

     FOR VALUE RECEIVED, the sufficiency of which is hereby acknowledged, and in consideration of any credit and/or financial accommodation heretofore or hereafter from time to time made or granted to Patterson-UTI Energy, Inc. (“Borrower”) or any other Loan Party under that certain Credit Agreement dated as of July 2, 2010 (the “Credit Agreement”), by and between Borrower, the financial institutions party thereto (collectively, the “Lenders”), and Wells Fargo Bank, N.A., as Administrative Agent (in such capacity, the “Administrative Agent”), each of the Persons now or hereafter signatories hereto (each a “Guarantor,” and, collectively, the “Guarantors”) hereby furnishes in favor of Administrative Agent and the Lenders (each a “Guaranteed Party” and collectively, the “Guaranteed Parties”) its joint and several guaranty of the Guaranteed Obligations (as hereinafter defined) as follows:

     1. Reference to Credit Agreement. Each Guarantor covenants and agrees that certain representations, warranties and covenants set forth in the Credit Agreement are applicable to Guarantors, and it (i) reaffirms that each such representation and warranty is true and correct in every material respect with respect to such Guarantor to the extent that such representation and warranty refers to such Guarantor, and (ii) agrees to comply with all of the covenants related to it, contained in the Credit Agreement. Each Guarantor agrees that if the Credit Agreement shall cease to remain in effect for any reason whatsoever during any period and any part of the Guaranteed Obligations (as hereinafter defined) remain unpaid, then the terms, covenants, and agreements thereof which are applicable to it shall nevertheless continue in full force and effect as obligations of such Guarantor under this Guaranty. Each Guarantor shall take, or refrain from taking, as the case may be, each action that is necessary to be taken or not taken, as the case may be, so that no Event of Default is caused by the failure to take or refrain from taking such action, as the case may be. All capitalized terms used but not defined herein shall have the meaning assigned to such term in the Credit Agreement.

     2. Guaranty. (a) Each Guarantor hereby, jointly and severally, absolutely and unconditionally guarantees, as a guarantee of payment and not as a guarantee of collection, the prompt payment in full in Dollars when due, whether at stated maturity, upon acceleration or otherwise, and at all times thereafter, of

          (i) any and all existing and future indebtedness and liabilities of every kind, nature and character, direct or indirect, absolute or contingent, liquidated or unliquidated, voluntary or involuntary, of any Loan Party arising under any Loan Document or otherwise with respect to any Loan, and

          (ii) all existing and future indebtedness and liabilities of the Borrower or any Subsidiary of the Borrower pursuant to any Lender Interest Rate Swap Contract arising while such Lender or its Affiliate is a Lender party to the Credit Agreement,

in each case including interest and fees that accrue after the commencement by or against any Loan Party or any Affiliate thereof of any proceeding under any Debtor Relief Laws naming such Person as the debtor in such proceeding, regardless of whether such interest and fees are

Exhibit E

allowed claims in such proceeding (collectively, the “Guaranteed Obligations”). As used herein, “Lender Interest Rate Swap Contract” means a Swap Contract between the Borrower or any Subsidiary of the Borrower and any Lender or Affiliate of a Lender entered into for purposes of mitigating interest rate risk.

          (b) The books and records of the Guaranteed Parties showing the amount of the Guaranteed Obligations shall be admissible in evidence in any action or proceeding, and shall be binding upon each Guarantor and conclusive for the purpose of establishing the amount of the Guaranteed Obligations, absent manifest error. This Guaranty shall not be affected by the genuineness, validity, regularity or enforceability of the Guaranteed Obligations or any instrument or agreement evidencing any Guaranteed Obligations, or by the existence, validity, enforceability, perfection, or extent of any collateral therefor, or by any fact or circumstance relating to the Guaranteed Obligations which might otherwise constitute a defense to the obligations of any Guarantor under this Guaranty.

          (c) The obligations of each Guarantor hereunder shall be limited to an aggregate amount equal to the largest amount that would not render its obligations hereunder subject to avoidance under Section 548 of the Bankruptcy Code (Title 11, United States Code) or any comparable provisions of any applicable state law.

     3. No Setoff or Deductions; Taxes. Each Guarantor represents and warrants that it is an entity formed or incorporated, as the case may be, under the laws of one or more states of the United States of America. All payments by the Guarantors hereunder shall be paid in full, without setoff or counterclaim or any deduction or withholding whatsoever for any and all Indemnified Taxes or Other Taxes. If any Guarantor must make a payment under this Guaranty, such Guarantor agrees that it will make the payment from one of its U.S. resident offices to Administrative Agent, on behalf of the Guaranteed Parties. If notwithstanding the foregoing, any Guarantor makes a payment to a Guaranteed Party under this Guaranty to which Guarantor shall be required by applicable law to deduct any Indemnified Taxes or Other Taxes from such payments, such Guarantor shall pay all such taxes to the relevant authority in accordance with applicable law such that the applicable Guaranteed Party receives the sum it would have received had no such deduction or withholding been made and shall also pay to such Guaranteed Party, within 30 days after demand therefor, all additional amounts which such Guaranteed Party specifies as necessary to preserve the after-tax yield would have received if such taxes had not been imposed. Such Guarantor shall promptly provide such Guaranteed Party with an original receipt or certified copy issued by the relevant authority evidencing the payment of any such amount required to be deducted or withheld.

     4. No Termination. This Guaranty is a continuing and irrevocable guaranty of all Guaranteed Obligations now or hereafter existing and shall remain in full force and effect until (i) all Guaranteed Obligations and any other amounts payable under this Guaranty are indefeasibly paid and performed in full, the Commitments of the Lenders under the Credit Agreement are terminated, or (ii) with respect to a Guarantor, such Guarantor is released from its obligations under this Guaranty by an instrument in writing signed by the Administrative Agent pursuant to the Credit Agreement (such Guarantor referenced in this clause (ii) is herein referred to as a “Released Guarantor”.

Exhibit E

     5. Waiver of Notices. Each Guarantor waives notice of the acceptance of this Guaranty and of the extension or continuation of the Guaranteed Obligations or any part thereof. Each Guarantor further waives presentment, protest, notice, dishonor or default, demand for payment and any other notices to which such Guarantor might otherwise be entitled.

     6. Subrogation. No Guarantor shall exercise any right of subrogation, contribution or similar rights with respect to any payments it makes under this Guaranty until all of the Guaranteed Obligations and any amounts payable under this Guaranty are indefeasibly paid and performed in full and the commitments of the Lenders under the Credit Agreement are terminated. If any amounts are paid to any Guarantor in violation of the foregoing limitation, then such amounts shall be held in trust for the benefit of the Guaranteed Parties and shall forthwith be paid to Administrative Agent, on behalf of the Guaranteed Parties, to reduce the amount of the Guaranteed Obligations, whether matured or unmatured.

     7. Waiver of Suretyship Defenses. Each Guarantor agrees that the Guaranteed Parties may, at any time and from time to time, and without notice to the Guarantors, make any agreement with Borrower or with any other person or entity liable on any of the Guaranteed Obligations or providing collateral as security for the Guaranteed Obligations, for the extension, renewal, payment, compromise, discharge or release of the Guaranteed Obligations or any collateral (in whole or in part), or for any modification or amendment of the terms thereof or of any instrument or agreement evidencing the Guaranteed Obligations or the provision of collateral, all without in any way impairing, releasing, discharging or otherwise affecting the obligations of the Guarantors under this Guaranty. Each Guarantor waives any defense arising by reason of any disability or other defense of Borrower or any other guarantor (including any other Guarantor hereunder), or the cessation from any cause whatsoever of the liability of Borrower or any other Loan Party, or any claim that such Guarantor’s obligations exceed or are more burdensome than those of Borrower or any other Loan Party and waives the benefit of any statute of limitations affecting the liability of such Guarantor hereunder. Each Guarantor waives any right to enforce any remedy which any Guaranteed Party now has or may hereafter have against Borrower or any other Loan Party and waives any benefit of and any right to participate in any security now or hereafter held by the Guaranteed Parties. Further, each Guarantor consents to the taking of, or failure to take, any action which might in any manner or to any extent vary the risks of such Guarantor under this Guaranty or which, but for this provision, might operate as a discharge of such Guarantor.

     8. Exhaustion of Other Remedies Not Required. The obligations of each Guarantor hereunder are those of primary obligor, and not merely as surety, and are independent of the Guaranteed Obligations. Each Guarantor waives diligence by the Guaranteed Parties and action on delinquency in respect of the Guaranteed Obligations or any part thereof, including, without limitation any provisions of law requiring the Guaranteed Parties to exhaust any right or remedy or to take any action against Borrower, any other guarantor (including any other Guarantor hereunder), or any other person, entity or property before enforcing this Guaranty against such Guarantor, including, but not limited to, the benefits of Chapter 34 of the Texas Business and Commerce Code, § 17.001 of the Texas Civil Practice and Remedies Code, and Rule 31 of the Texas Rules of Civil Procedure, or any similar statute.

Exhibit E

     9. Reinstatement. Notwithstanding anything in this Guaranty to the contrary, this Guaranty shall continue to be effective or be reinstated, as the case may be, if at any time any payment of any portion of the Guaranteed Obligations is revoked, terminated, rescinded or reduced or must otherwise be restored or returned upon the insolvency, bankruptcy or reorganization of Borrower or any other person or entity or otherwise, as if such payment had not been made and whether or not the Guaranteed Parties have in possession of or have released this Guaranty and regardless of any prior revocation, rescission, termination or reduction, in each case, however, other than a Released Guarantor.

     10. Subordination. Each Guarantor hereby subordinates, to the extent herein provided and except as otherwise set forth below in this Section 10, all obligations and indebtedness of any Loan Party owing to such Guarantor, whether now existing or hereafter arising (the “Subordinated Obligations”), to the indefeasible payment in full of all Guaranteed Obligations. As long as no Event of Default has occurred and is continuing, this Guaranty shall not limit any Guarantor’s right to receive payment from any Loan Party on account of any Subordinated Obligations. Upon the occurrence and during the continuation of an Event of Default, the Guarantor agrees not to accept any payment for any Subordinated Obligations. In the event of (i) any insolvency, bankruptcy, receivership, liquidation, reorganization, readjustment, composition or other similar proceeding relating to a Loan Party, its creditors as such or its property, (ii) any proceeding for the liquidation, dissolution or other winding-up of a Loan Party, voluntary or involuntary, whether or not involving insolvency or bankruptcy proceedings, (iii) any assignment by a Loan Party for the benefit of creditors, or (iv) any other marshalling of the assets of a Loan Party, the Guaranteed Obligations (including any interest thereon accruing at the legal rate after the commencement of any such proceedings and any additional interest that would have accrued thereon but for the commencement of such proceedings) shall first be paid in full before any payment or distribution, whether in cash, securities or other property, shall be made by or on behalf of or from the estate of such Loan Party to any holder of Subordinated Obligations. If a Guarantor receives any payment of any Subordinated Obligations in violation of the terms of this Section, such Guarantor shall hold that payment in trust for Administrative Agent and Lenders and promptly turn it over to Administrative Agent, in the form received (with any necessary endorsements), to be applied to the Guaranteed Obligations.

     11. Information. Each Guarantor agrees to furnish promptly to Administrative Agent such information of the type described in Section 6.02(h) of the Credit Agreement.

     12. Stay of Acceleration. In the event that acceleration of the time for payment of any of the Guaranteed Obligations is stayed, upon the insolvency, bankruptcy or reorganization of Borrower or any other person or entity, or otherwise, all such amounts shall nonetheless be payable by the Guarantors, jointly and severally, immediately upon demand by the Guaranteed Parties.

     13. Expenses. Each Guarantor shall pay, jointly and severally, on demand all out-of-pocket expenses (including reasonable attorneys’ fees and expenses and the allocated cost and disbursements of internal legal counsel) in any way relating to the enforcement or protection of any Guaranteed Party’s rights under this Guaranty, including any incurred in the preservation, protection or enforcement of any rights of any Guaranteed Party in any case commenced by or

Exhibit E

against any Guarantor under the Bankruptcy Code (Title 11, United States Code) or any similar or successor statute. The obligations of each Guarantor under the preceding sentence shall survive termination of this Guaranty.

     14. Application of Payments. Any payment received by any Guaranteed Party from any Guarantor (or from any Lender pursuant to Paragraph 19 below), shall be remitted to and applied by Administrative Agent in accordance with Section 8.03 of the Credit Agreement.

     15. Amendments. No amendment or waiver of any provision of this Guaranty, nor consent to any departure by any Guarantor herefrom, shall in any event be effective unless the same shall be in writing and signed, in the case of amendments, by the Guarantor(s) affected thereby and by Administrative Agent, and, in the case of consents or waivers, by Administrative Agent, and then such amendment, waiver or consent shall be effective only in the specific instance and for the specific purpose for which made or given. Notwithstanding the foregoing, no Guarantor shall be released from this Guaranty except by a writing signed by the Administrative Agent as permitted by Section 9.10 or Section 10.01 of the Credit Agreement.

     16. No Waiver; Enforceability. No failure by the Guaranteed Parties to exercise, and no delay in exercising, any right, remedy or power hereunder shall operate as a waiver thereof; nor shall any single or partial exercise of any right, remedy or power hereunder preclude any other or further exercise thereof or the exercise of any other right. The remedies herein provided are cumulative and not exclusive of any remedies provided by law or in equity. The unenforceability or invalidity of any provision of this Guaranty shall not affect the enforceability or validity of any other provision herein.

     17. Assignment; Governing Laws; Jurisdiction. This Guaranty shall (a) bind each Guarantor and its successors and assigns, provided that such Guarantor may not assign its rights or obligations under this Guaranty without the prior written consent of Administrative Agent and the Lenders (and any attempted assignment without such consent shall be void), (b) inure to the benefit of the Guaranteed Parties and their successors and permitted assigns and each Lender may, without notice to the Guarantor and without affecting the Guarantor’s obligations hereunder, assign or sell participations in the Guaranteed Obligations and this Guaranty, in whole or in part, and (c) be governed by the internal laws of the State of New York; provided that the Administrative Agent and each Lender shall retain all rights arising under applicable federal law.

     Each Guarantor hereby irrevocably (i) submits to the non exclusive jurisdiction of any State court sitting in New York City, any United States District Court of the Southern District of New York, and any appellate court from any thereof, in any action or proceeding arising out of or relating to this Guaranty, and (ii) waives to the fullest extent permitted by applicable law any defense asserting an inconvenient forum in connection therewith. Service of process by the Guaranteed Parties in connection with such action or proceeding shall be binding on each Guarantor if sent to such Guarantor by registered or certified mail at its address specified below. Subject to such Lender’s compliance with Section 10.07 of the Credit Agreement, each Guarantor agrees that each Lender may disclose to any prospective purchaser and any purchaser of all or part of the Guaranteed Obligations any and all information in such Lender’s possession concerning such Guarantor, this Guaranty and any security for this Guaranty.

Exhibit E

     18. Condition of Borrower. Each Guarantor acknowledges and agrees that it has the sole responsibility for, and has adequate means of, obtaining from Borrower such information concerning the financial condition, business and operations of Borrower as such Guarantor requires, and that the Guaranteed Parties have no duty, and such Guarantor is not relying on the Guaranteed Parties at any time, to disclose to such Guarantor any information relating to the business, operations or financial condition of Borrower.

     19. Setoff. Each Guarantor agrees to the provisions of Section 10.08 of the Credit Agreement.

     20. Further Assurances. Each Guarantor agrees that at any time and from time to time, at the expense of such Guarantor, to promptly execute and deliver all further instruments and documents, and take all further action, that may be necessary or desirable, or that Administrative Agent may reasonably request, to enable Administrative Agent to protect and to exercise and enforce the rights and remedies of the Guaranteed Parties hereunder.

     21. Addition of Guarantors. The initial Guarantors hereunder shall be each of the Subsidiaries of Borrower that are signatories hereto and that are listed on Schedule 1 attached hereto. From time to time subsequent to the time hereof, additional Subsidiaries of Borrower may become parties hereto as additional Guarantors (each an “Additional Guarantor”) by executing a counterpart of this Guaranty Agreement in the form of Exhibit A attached hereto and delivery to the Administrative Agent of all items required pursuant to Section 6.12(b) of the Credit Agreement. Upon delivery of any such counterpart to Administrative Agent, notice of which is hereby waived by Guarantors, each such Additional Guarantor shall be a Guarantor and shall be a party hereto as if such Additional Guarantor were an original signatory hereof. Each Guarantor expressly agrees that its obligations arising hereunder shall not be affected or diminished by the addition or release of any other Guarantor hereunder, or by any election by Administrative Agent not to cause any Subsidiary of Borrower to become an Additional Guarantor hereunder.

     22. Notices. All notices, requests and other communications provided for hereunder shall be in writing and given to Administrative Agent or any Guarantor as provided in Section 10.02 of the Credit Agreement.

     23. Joint and Several Obligations. Each Guarantor acknowledges that (i) this Guaranty is a master Guaranty pursuant to which other Subsidiaries of Borrower now or hereafter may become parties, and (ii) the guaranty obligations of each of the Guarantors hereunder are joint and several.

     24. WAIVER OF JURY TRIAL; FINAL AGREEMENT. TO THE EXTENT ALLOWED BY APPLICABLE LAW, EACH GUARANTOR AND EACH GUARANTEED PARTY WAIVES TRIAL BY JURY WITH RESPECT TO ANY ACTION, CLAIM, SUIT OR PROCEEDING ON OR ARISING OUT OF THIS GUARANTY. THIS GUARANTY (INCLUDING ANY SUPPLEMENTAL GUARANTY OR OTHER AGREEMENT BY WHICH A PERSON BECOMES A GUARANTOR), AND THE CREDIT AGREEMENT REPRESENT THE FINAL AGREEMENT BETWEEN THE PARTIES WITH RESPECT TO THE SUBJECT MATTER HEREOF AND MAY NOT BE CONTRADICTED BY EVIDENCE

Exhibit E

OF PRIOR, CONTEMPORANEOUS, OR SUBSEQUENT ORAL AGREEMENTS BETWEEN THE PARTIES.

THERE ARE NO UNWRITTEN ORAL AGREEMENTS BETWEEN THE PARTIES.

Remainder of Page Intentionally Blank.
Signature(s) Page to Follow.

Exhibit E

     IN WITNESS WHEREOF, the Guarantors have caused this Guaranty to be duly executed and delivered by their respective officers thereunto duly authorized as of July ___, 2010.

[NAMES OF THE GUARANTORS]

Exhibit E

SCHEDULE 1

INITIAL GUARANTORS

Patterson Petroleum LLC
Patterson-UTI Drilling Company LLC
Patterson-UTI Drilling International, Inc.
Patterson-UTI Management Services, LLC
Universal Well Services, Inc.

Schedule 1 to Exhibit E

EXHIBIT A

COUNTERPART TO CONTINUING GUARANTY

     In witness whereof, the undersigned Additional Guarantor has caused this Counterpart to Continuing Guaranty to be duly executed and delivered by its duly authorized officer as of                      ___, 20___.

Exhibit A to Exhibit E

EXHIBIT F

FORM OF OPINION OF COUNSEL

July ___, 2010

Each of the Lenders under the

Credit Agreement, including those
Lenders listed in Schedule A hereto

Wells Fargo Bank, N.A.,

as Administrative Agent for the Lenders and Lender

[Address to come]

Ladies and Gentlemen:

     We have acted as counsel to Patterson-UTI Energy, Inc., a Delaware corporation (the “Company”), in connection with its execution and delivery of (i) the Credit Agreement dated as of July 2, 2010 (the “Credit Agreement”), among the Company, the lenders from time to time parties thereto (the “Lenders”), and Wells Fargo Bank, N.A., as administrative agent (in such capacity, the “Administrative Agent”), land lender, and (ii) the promissory note dated July ___, 2010 (the “Note”), executed and delivered by the Company pursuant to the Credit Agreement. In addition, we have acted as counsel to the Guarantors each in connection with its execution and delivery of the Continuing Guaranty dated as of July ___, 2010 (the “Guaranty”). Capitalized terms used and not defined herein or in any Schedule hereto have the meanings assigned to such terms in the Credit Agreement. The opinions expressed herein are being furnished to you pursuant to Section 4.01(a)(v) of the Credit Agreement.

     In rendering the opinions expressed herein, we have (i) examined the Credit Agreement, the Note, and the Guaranty (collectively, the “Financing Documents”), corporate records of the Company and each of the Guarantors (collectively, the “Loan Parties”), certificates of representatives of the Loan Parties, certificates and other communications of public officials and such other instruments, agreements and documents as are in our judgment necessary to enable us to render the opinions expressed herein, and (ii) as to questions of fact material to the opinions expressed herein, and as to factual matters arising in connection with our examination of the aforesaid materials, relied, to the extent we deemed appropriate, upon the factual representations and warranties contained in the Financing Documents, upon such certificates, communications, instruments, agreements, and documents and certain facts stated elsewhere herein.

     In making such examination and in such reliance, we have assumed the authenticity and completeness of all records, certificates, instruments, agreements, and other documents submitted to us as originals, the conformity to authentic originals, records, certificates, instruments, agreements, and other documents of all copies submitted to us as copies, and the authenticity of the originals of such latter records, certificates, instruments, agreements, and other documents. In addition, we have assumed the legal capacity of each natural person identified in, or indicated as

Wells Fargo Bank, N.A., as Administrative Agent
June ___, 2010

having executed, any of those records, certificates, instruments, agreements, and other documents and the genuineness of all signatures on all such records, certificates, instruments, agreements, and other documents.

     In rendering the opinions expressed herein, we also have assumed the following:

          (i) each Person a party to any Financing Document other than a Loan Party (each such Person other than the Loan Parties, an “Other Party”) (a) has been duly organized or formed (as applicable), (b) is validly existing and in good standing under the laws of its jurisdiction of incorporation or formation (as applicable), and (c) has the corporate or equivalent power and authority to execute and deliver, and to perform its obligations under, each of the Financing Documents in which such Person is identified as a party;

          (ii) the execution and delivery of each of the Financing Documents by each Other Party, and the performance of its obligations thereunder, have been duly authorized by all necessary corporate or equivalent action on the part of each such Other Party;

          (iii) each Other Party has duly executed and delivered each of the Financing Documents in which such Other Party is identified as a party;

          (iv) each Person a party to any Financing Document other than a Loan Party has (a) satisfied each legal requirement that is applicable to such Person to the extent necessary to make such Financing Document enforceable against such Person, and (b) complied with any other legal requirements pertaining to the status of such Person as such status relates to the rights of such Person to perform or enforce (as applicable) such Financing Document against each other Person that is identified as a party to such Financing Document;

          (v) no order, consent, approval, license, authorization, waiver, or validation of, or filing, recording, or registration with, or notice to, or exemption by any court, governmental body, or authority, or any subdivision thereof, is required to authorize or is required in connection with the execution and delivery of any Financing Document by any Person identified in any such Financing Document as a party thereto or in connection with the performance of any such Person’s obligations thereunder or the consummation of the transactions contemplated thereby, other than those that have been obtained or made and are in full force and effect (provided, that we make no such assumption with respect to consents, approvals, and the like applicable to the Loan Parties to the extent that we express our opinion rendered in paragraph 6 below);

          (vi) each of the Financing Documents is the valid and binding obligation of each Person identified as a party thereto (other than a Loan Party), enforceable against each such Person in accordance with its terms; and

          (vii) Administrative Agent has been and is the duly appointed agent of each of the Lenders (the Administrative Agent and Lenders collectively, the “Financing Parties”).

Wells Fargo Bank, N.A., as Administrative Agent
June ___, 2010

     Based upon the foregoing and in the reliance thereon, and subject to and qualified by the assumptions, qualifications, limitations, and exceptions set forth herein, and having due regard for such legal considerations as we deem relevant, we are of the opinion that:

          1. a. The Company is validly existing as a corporation in good standing under the General Corporation Law of the State of Delaware (the “DGCL”).

               b. Each of the Delaware Corporations is validly existing as a corporation in good standing under the DGCL.

               c. Each of the Delaware LLCs is validly existing as a limited liability company in good standing under the Delaware Limited Liability Company Act (the “Delaware LLC Act”).

               d. Each of the Texas LLCs is validly existing as a limited liability company under the Texas Limited Liability Company Law of the Texas Business Organizations Code.

          2. The execution and delivery by each Loan Party of each Financing Document to which it is a party, and the performance by such Loan Party of its obligations thereunder, are within its corporate or limited liability company (as the case may be) power and authority and have been duly authorized by all necessary corporate or limited liability company (as the case may be) action.

          3. Each Financing Document to which a Loan Party is a party has been duly executed and delivered by it.

          4. Under the internal laws of the State of New York, each of the Financing Documents to which a Loan Party is a party is a valid and binding obligation of such Loan Party, enforceable against such Loan Party in accordance with its terms.

          5. Neither the execution and delivery by a Loan Party of any Financing Document to which it is a party, nor the performance of its obligations thereunder, will (i) result in a violation by it of (a) any statutory law or regulation applicable to such Person, or (b) the certificate of incorporation and bylaws or certificate of formation or limited liability company agreement (as the case may be) of such Person, or (ii) result in a breach of, or constitute a default under, the terms of any agreement or instrument binding on such Person which is filed as an exhibit to the Company’s Annual Report on Form 10-K for the year ended December 31, 2009.

          6. No consent, approval, authorization, or waiver of, or notice to or filing with, or other action by, any governmental authority is required to be obtained or made by a Loan Party by any material statutory law or regulation applicable to such Loan Party as a condition to the execution and delivery by such Loan Party of any Financing Document to which it is a party, or the performance by such Loan Party of its obligations under any Financing Document to which it is a party.

Wells Fargo Bank, N.A., as Administrative Agent
June ___, 2010

          7. None of the Loan Parties is an “investment company,” as such term is defined in the Investment Company Act of 1940, as amended.

          8. Assuming the Company complies with the provisions of the Credit Agreement relating to the use of proceeds thereunder (whether or not therein stated as a covenant), the use by it of proceeds from the Loans will not result in a violation of Regulation U of the Federal Reserve Board.

     The foregoing opinions expressed herein are further subject to, and qualified by, the following assumptions, exceptions, qualifications, and limitations:

          A. The opinions expressed herein are limited exclusively to the laws of the States of New York and Texas, the DGCL, the Delaware LLC Act, and the federal statutory laws and regulations of the United States of America. In respect to such laws, in addition to other limitations set forth herein, such reference is limited to laws that are normally applicable to the transactions provided for in the Financing Documents, and, in any event and without limitation, does not include statutes, laws, rules, or regulations relating to (i) the operation of any asset or property, (ii) utility regulation, (iii) antitrust, (iv) taxation, or (v) securities law, or the construction or interpretations of any of the foregoing, or authorizations, permits, consents, and the like with respect thereto. Reference herein to the “internal laws” of a jurisdiction is to the laws of that jurisdiction, other than (x) that jurisdiction’s choice-of-law statutes and rules, (y) the statutes and ordinances, the administrative decisions, and the rules and regulations of counties, towns, municipalities, and political subdivisions (whether created or enabled through legislative action at the federal, state, regional, or local level), and (z) judicial decisions to the extent they deal with any of the foregoing.

          B. The opinions expressed in paragraph 4 hereof (such opinions expressed in such paragraph, the “Remedies Opinions”) are further subject to the following:

          (i) The enforceability of the Financing Documents, and to the extent applicable, the Liens created thereby, may be limited or affected by (a) bankruptcy, insolvency, reorganization, moratorium, liquidation, rearrangement, conservatorship, receivership, fraudulent conveyance, or transfer or similar laws (including court decisions) relating to or affecting the rights and remedies of creditors generally or providing for the relief of debtors, (b) general principles of equity, including, without limitation, requirements of good faith, fairness, and reasonableness, and the possible unavailability of specific performance or injunctive relief (regardless of whether enforceability is considered in a proceeding in equity or at law), (c) the refusal of a particular court to grant (1) equitable remedies, including, without limitation, specific performance and injunctive relief, or (2) a particular remedy sought by a Financing Party under any Financing Document as opposed to another remedy provided for therein or another remedy available at law or in equity, and (d) judicial discretion.

          (ii) In rendering the Remedies Opinions expressed in paragraph 4, we express no opinion as to the validity or enforceability of any provision of any Financing Document that:

Wells Fargo Bank, N.A., as Administrative Agent
June ___, 2010

     (1) purports to (i) establish evidentiary standards or characterizations, treatments or effects of payments or rights, in each case made or existing under, or in connection with, any Financing Document, (ii) waive or otherwise affect any right, warranty, or defense that cannot be waived or otherwise affected as a matter of law, (iii) negate the effect of any course of dealing or any exercise, or failure or delay to exercise, any right, power, privilege, or remedy, (iv) relate to indemnities, exculpation, or contribution to the extent prohibited by public policy or require indemnification or contribution (as applicable) for liability on account of fraud, gross negligence, willful misconduct, breach of the performance of an agreed undertaking, violation of law or illegal conduct (or the public policy underlying such action or conduct) of any Person seeking or asserting the benefit of such indemnity, exculpation, or contribution provision, (v) limit liability of any Person to claims for gross negligence or willful misconduct, (vi) grant to any Person the right to offset special deposits against obligations owed under the Financing Documents, (vii) authorize conclusive determinations by any party or to permit a party to make determinations in its sole discretion, or (viii) restrict access to legal or equitable remedies;

     (2) states that (i) prohibition, illegality, invalidity, or unenforceability of any provision of such Financing Document in any jurisdiction shall not (a) invalidate the remaining provisions of such Financing Document, or (b) affect that provision in any other jurisdiction, or (ii) the right of any Person to exercise any right or remedy on the basis of any misrepresentation or breach of warranty is not affected by any action by a Lender;

     (3) constitutes a submission to or acceptance of the jurisdiction of, or permits an action against any Person to be brought, or waives any objection to the laying of venue or choice of forum in such an action, in, the courts of any jurisdiction, other than the courts of the State of New York or the federal courts of the United States of America sitting in the State of New York;

     (4) permits an action against any Person to be brought in the courts of the State of New York (i) if such Person has not been served with process in that action in accordance with applicable rules of procedure, or (ii) if the court in which the action is brought does not have jurisdiction of the subject matter of the action;

     (5) permits an action against any Person to be brought in the federal courts of the United States of America sitting in the State of New York (i) if such Person has not been served with process in accordance with applicable rules of procedure, or (ii) if those courts do not have jurisdiction in the subject matter of the action;

     (6) requires the reimbursement to any Person whose breach of a recognizable standard of performance or care in acting or failing timely or otherwise properly to act substantially contributed to the basis for which such reimbursement is sought; or

Wells Fargo Bank, N.A., as Administrative Agent
June ___, 2010

     (7) provides for the enforcement in any jurisdiction of a judgment of the courts of another jurisdiction.

          (iii) We have assumed that each Financing Party will act reasonably and in good faith in performing its duties, and in exercising its rights and remedies, under the Financing Documents. In this regard, we note that the enforceability of specific provisions of the Financing Documents may be subject to standards of reasonableness, care and diligence and “good faith” limitations and obligations such as those provided in Sections 1.302(b), 1.304, 1.309, and 5.109 of the Uniform Commercial Code as in effect in the State of New York and similar applicable principles of common law and judicial precedent. Further, we have also assumed that each Financing Party will enforce the respective Financing Documents in compliance with the provisions thereof and all requirements of applicable law.

          (iv) Furthermore, we note that the maximum lawful amount or rate of interest which any national bank, a federal savings bank or any foreign bank or branch of a foreign bank which is subject to the jurisdiction of the federal banking laws of the United States of America, may take, receive, reserve, contract for, or charge is governed by federal statutory law. Further, Financing Parties that are entities other than such financial institutions may, in accordance with laws governing their respective operation and business, be subject to statutory limits provided by the laws other than the laws of the State of New York. In rendering the Remedies Opinions, we express no opinion as to whether the interest provided for in any Financing Document is in excess of any such maximum lawful amount or rate or as to the effect of the provisions for interest in any Loan Document on the enforceability of the Financing Documents with respect to any Financing Party constituting a national bank or such foreign bank or branch thereof which is located in any jurisdiction other than the State of New York.

          C. We do not express any opinion with respect to any exhibit to, or other agreement referred to in, any of the Financing Documents.

          D. In rendering the foregoing opinions, we have not, pursuant to our engagement, endeavored to express any opinions, and we express no opinions, and none are intended to be implied hereby nor shall be inferred herefrom, as to (i) the various state and federal laws, statutes, regulations, interpretations, opinions, directives, orders, rulings, authorities, or similar matters regulating or governing any Financing Party (collectively, the “Rules”) and/or its entry into, execution, delivery, or performance of the Financing Documents, or the transactions provided for therein, or the conduct of its business related thereto, or (ii) any Financing Party’s compliance with any of the Rules in connection with any Financing Document, or the transactions provided for therein.

          E. In rendering the opinions expressed in paragraph 1 above relating to existence and good standing, we have relied solely upon a review of certificates of public officials, without further investigation as to matters set forth therein, and such opinions are limited to the dates of such certificates.

Wells Fargo Bank, N.A., as Administrative Agent
June ___, 2010

          The opinions expressed herein are solely for the benefit of, and may only be relied upon by each Financing Party, and its permitted successors and assigns, in connection with the Financing Documents; provided however, any reliance on such opinions by a Person who becomes a party to the Financing Documents after the date of this opinion letter shall be as to the opinions expressed herein as of the date of this opinion letter and shall not constitute a reissuance of such opinions as of the date of any such subsequent reliance or other subsequent date. Neither this opinion letter nor any excerpt hereof (nor any reproduction of any of the foregoing) may be furnished to (except in connection with a legal or arbitral proceeding or as may be required by applicable law, and in any such events, as shall be directed and required incident thereto pursuant to a duly issued subpoena, writ, order or other legal process), or relied upon by, any other Person without the prior written consent of this Firm. The opinions expressed herein are as of the date hereof (and not as of any other date, including, without limitation, the effective date of any Financing Document if a date other than the date hereof) or, to the extent a reference to certificates of public officials or other documents made herein, such date or dates, and we make no undertaking to amend or supplement such opinions as facts and circumstances come to our attention or changes in the law occur which could affect such opinions.

Very truly yours,

DRAFT

Fulbright & Jaworski L.L.P.

SCHEDULE A
LIST OF LENDERS

Wells Fargo Bank, N.A.

SCHEDULE B
LIST OF GUARANTORS

The Persons listed immediately below, collectively, the “Delaware Corporations”

Patterson-UTI Drilling International, Inc.
Universal Well Services, Inc.

The Persons listed immediately below, collectively the “Delaware LLCs”

Patterson-UTI Management Services, LLC

The Persons listed immediately below, collectively, the “Texas LLCs”

Patterson Petroleum LLC
Patterson-UTI Drilling Company LLC

The Delaware Corporations, Delaware LLCs, and Texas LLCs, collectively, the “Guarantors.”

Schedule B to Exhibit F

EXHIBIT G

FORM OF PREPAYMENT NOTICE

Date:                     , _____

To:     Wells Fargo Bank, N.A., as Administrative Agent

Ladies and Gentlemen:

     Reference is made to that certain Credit Agreement, dated as of July 2, 2010 (as amended, restated, extended, supplemented or otherwise modified in writing from time to time, the “Agreement;” the terms defined therein being used herein as therein defined), among Patterson-UTI Energy, Inc., a Delaware corporation (the “Borrower”), the Lenders from time to time party thereto, and Wells Fargo Bank, N.A., as Administrative Agent.

     The undersigned hereby gives notice of prepayment on the following Type of Loan (select one):

     o Base Rate Loans   o Eurodollar Rate Loans

     1. On                                          (a Business Day).

     2. In the amount of $                     .

     The giving of this notice and the amount of the prepayment of the Loans indicated herein comply with Section 2.04(a) of the Agreement.

Exhibit G