Document:

EX-10.1

 Exhibit 10.1 

Execution Version 

AMENDMENT NO. 4 TO CREDIT AGREEMENT 

This AMENDMENT NO. 4 TO CREDIT AGREEMENT (“Agreement”) dated as of April 20, 2017 (“Effective Date”) is
by and among Patterson-UTI Energy, Inc., a Delaware corporation (“Borrower”), the subsidiaries of the Borrower party hereto (together with the Borrower, the “Loan Parties”),
the Lenders party hereto (as defined below), and Wells Fargo Bank, N.A., as administrative agent (in such capacity, the “Administrative Agent”) for the Lenders, as the issuer of letters of credit under the Credit Agreement referred
to below (in such capacity, an “L/C Issuer”), and as the swing line lender under the Credit Agreement referred to below (in such capacity, the “Swing Line Lender”). 

RECITALS 

A.     Reference is hereby made to that certain Credit Agreement dated as of September 27, 2012 among the Borrower,
the Administrative Agent, each L/C Issuer, the Swing Line Lender and the financial institutions party thereto from time to time, as lenders (the “Lenders”), as amended, supplemented or otherwise modified by that certain Amendment
No. 1 to Credit Agreement dated as of January 9, 2015, Amendment No. 2 to Credit Agreement dated as of July 8, 2016, Amendment No. 3 to Credit Agreement dated as of January 17, 2017, Commitment Increase Agreement dated
as of January 24, 2017 and Commitment Increase Agreement dated as of and after giving effect to the Effective Date (the “April Commitment Increase Agreement”), each among the Borrower, subsidiaries of the Borrower party
thereto, the Administrative Agent, each L/C Issuer, the Swing Line Lender and the financial institutions party thereto (as so amended, the “Credit Agreement”). 

B.     The Borrower has requested that the Lenders and L/C Issuer make certain amendments to the Credit Agreement, subject
to the terms and conditions set forth herein. 
 NOW THEREFORE, in consideration of the premises and the mutual covenants, representations
and warranties contained herein, and for other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the parties hereto agree as follows: 

Section 1.    Defined Terms; Interpretation and Provisions. As used in this Agreement, each of the
terms defined in the opening paragraph and the Recitals above shall have the meanings assigned to such terms therein. Each term defined in the Credit Agreement, as amended hereby, and used herein without definition shall have the meaning assigned to
such term in the Credit Agreement, as amended hereby, unless expressly provided to the contrary. Article, Section, Schedule, and Exhibit references are to Articles and Sections of and Schedules and Exhibits to this Agreement, unless otherwise
specified. The words “hereof”, “herein”, and “hereunder” and words of similar import when used in this Agreement shall refer to this Agreement as a whole and not to any particular provision of this Agreement. The term
“including” means “including, without limitation”. Paragraph headings have been inserted in this Agreement as a matter of convenience for reference only and it is agreed that such paragraph headings are not a part of this
Agreement and shall not be used in the interpretation of any provision of this Agreement. 

Section 2.    Amendments to Credit Agreement. 

(a)    Section 1.01 of the Credit Agreement is hereby amended by adding the following definitions in the appropriate
alphabetical order: 
 “Amendment No. 4 Effective Date” means April 20,
2017. 

 “Existing Seventy Seven Letters of Credit” means those
certain letters of credit outstanding on the Amendment No. 4 Effective Date and issued by Wells Fargo or Bank of America, N.A. under that certain Amended and Restated Credit Agreement among Seventy Seven Energy Inc., certain of its subsidiaries
and affiliates, the lenders party thereto, Wells Fargo as administrative agent, joint lead arranger, joint lead book runner and co-documentation agent, and Bank of America, N.A. as joint lead arranger, joint
lead book runner and co-documentation agent dated as of August 1, 2016, as it may have been amended and including those that are listed on Schedule 1.01(b). 

(b)    Section 1.01 of the Credit Agreement is hereby amended by restating the definition of “Letter of Credit”
with the following: 
 “Letter of Credit” means any letter of credit issued or deemed issued hereunder
and shall include the Existing Letters of Credit and the Existing Seventy Seven Letters of Credit. A Letter of Credit may be a standby letter of credit or a commercial letter of credit. 

(c)    Section 2.03(a)(i) is hereby amended by adding the following sentence to the end thereof as follows: 

All Existing Seventy Seven Letters of Credit shall be deemed to have been issued pursuant hereto, and from and after the Amendment
No. 4 Effective Date shall be “Letters of Credit” hereunder and shall be subject to and governed by the terms and conditions hereof. 

(d)    Section 2.03(b)(ii) is hereby amended by replacing the last sentence therein with the following: 

Immediately upon the issuance of each Letter of Credit (including, for the avoidance of doubt, the deemed issuance of any Existing Letter of
Credit and any Existing Seventy Seven Letter of Credit), each Revolving Credit Lender shall be deemed to, and hereby irrevocably and unconditionally agrees to, purchase from such L/C Issuer a risk participation in such Letter of Credit in an amount
equal to the product of such Revolving Credit Lender’s Applicable Revolving Credit Percentage times the amount of such Letter of Credit. 

(e)    Section 2.14(a) of the Credit Agreement is hereby amended by replacing the reference to “$600,000,000”
therein with “$700,000,000”. 
 (f)    Schedule 1.01(b) attached hereto is hereby added to the
Credit Agreement as Schedule 1.01(b) thereto. 
 Section 3.    Loan Parties’ Representations and
Warranties. The Borrower acknowledges, represents, warrants and agrees as to itself and all other Loan Parties, and each other Loan Party acknowledges, represents, warrants and agrees as to itself, that: (a) after giving effect
to this Agreement, the representations and warranties contained in the Credit Agreement, as amended hereby, and the representations and warranties contained in the other Loan Documents are true and correct in all material respects on and as of the
Effective Date and on the date hereof as if made on as and as of such date except to the extent that any such representation or warranty expressly relates solely to an earlier date, in which case such representation or warranty is true and correct
in all material respects as of such earlier date; 

  
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(b) the execution, delivery and performance of this Agreement are within the limited liability company or corporate power and authority of such Loan Party and have been duly authorized by
appropriate limited liability company and corporate action and proceedings; (c) this Agreement constitutes the legal, valid, and binding obligation of such Loan Party enforceable in accordance with its terms, except as limited by applicable
bankruptcy, insolvency, reorganization, moratorium, or similar laws affecting the rights of creditors generally and general principles of equity, and no portion of the Obligations are subject to avoidance, subordination, recharacterization,
recovery, attack, offset, counterclaim, or defense of any kind; (d) there are no governmental or other third party consents, licenses and approvals required to be made or obtained by it in connection with its execution, delivery, performance,
validity and enforceability of this Agreement; (e) no Defaults or Events of Default shall have occurred and be continuing; and (f) since the date of the financial statements most recently delivered pursuant to Section 6.01(a) of the Credit
Agreement, there has been no event or circumstance, either individually or in the aggregate, that has had or could reasonably be expected to have a Material Adverse Effect. 

Section 4.    Conditions to Effectiveness. This Agreement shall become effective on the
Effective Date and enforceable against the parties hereto upon the occurrence of the following conditions precedent: 

(a)    the receipt by the Administrative Agent of multiple original counterparts of this Agreement executed and delivered
by duly authorized officers of the Borrower, the Guarantors, the Administrative Agent, and the Required Lenders; 

(b)    evidence satisfactory to the Administrative Agent of the payment in full by the Borrower of all the fees and
expenses required to be paid as of or on the Effective Date by Section 10.04 of the Credit Agreement or any other provision of a Loan Document to the extent invoiced prior to the Effective Date; and 

(c)    (i) the Commitment Increase Date under, and as defined in, that certain Commitment Increase Agreement dated as of
January 24, 2017 among the Borrower, the increasing Lenders therein, and Wells Fargo as Administrative Agent, L/C Issuer and Swing Line Lender and (ii) the Commitment Increase Date under the April Commitment Increase Agreement, shall each
have occurred or shall have occurred substantially concurrently with the effectiveness of this Agreement. 

Section 5.    Acknowledgments and Agreements. 

(a)    Each Loan Party acknowledges that on the date hereof all outstanding Obligations are payable in accordance with
their terms and each Loan Party waives any defense, offset, counterclaim or recoupment with respect thereto. The Administrative Agent, each L/C Issuer, the Swing Line Lender and the Lenders hereby expressly reserve all of their rights, remedies, and
claims under the Loan Documents. Nothing in this Agreement shall constitute a waiver or relinquishment of (i) any Default or Event of Default under any of the Loan Documents, (ii) any of the agreements, terms or conditions contained in any
of the Loan Documents, (iii) any rights or remedies of the Administrative Agent, each L/C Issuer, the Collateral Agent or any Lender with respect to the Loan Documents, or (iv) the rights of the Administrative Agent, each L/C Issuer, the
Swing Line Lender or any Lender to collect the full amounts owing to them under the Loan Documents. 
 (b)    The
Borrower, each Guarantor, Administrative Agent, each L/C Issuer, Swing Line Lender and each Lender does hereby adopt, ratify, and confirm the Credit Agreement, as amended hereby, and acknowledges and agrees that the Credit Agreement, as amended
hereby, is and remains in full force and effect, and the Borrower and the Guarantors acknowledge and agree that their respective liabilities and obligations under the Credit Agreement, as amended hereby, and the Guaranty, are not impaired in any
respect by this Agreement. 

  
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 (c)    From and after the Effective Date, all references to the Credit
Agreement and the Loan Documents shall mean the Credit Agreement and such Loan Documents as amended by this Agreement. 

(d)    This Agreement is a Loan Document for the purposes of the provisions of the other Loan Documents. 

Section 6.    Reaffirmation of the Guaranty. Each Guarantor party hereto hereby ratifies, confirms,
acknowledges and agrees that its obligations under the Guaranty are in full force and effect and that such Guarantor continues to unconditionally and irrevocably guarantee the full and punctual payment, when due, whether at stated maturity or
earlier by acceleration or otherwise, all of the Guaranteed Obligations (as defined in the Guaranty), and its execution and delivery of this Agreement does not indicate or establish an approval or consent requirement by such Guarantor under the
Guaranty, in connection with the execution and delivery of amendments, consents or waivers to the Credit Agreement or any of the other Loan Documents. 

Section 7.    Counterparts. This Agreement may be signed in any number of counterparts, each of
which shall be an original and all of which, taken together, constitute a single instrument. This Agreement may be executed by facsimile signature or other electronic imaging means, and all such signatures shall be effective as originals. 

Section 8.    Successors and Assigns. This Agreement shall be binding upon and inure to the
benefit of the parties hereto and their respective successors and assigns permitted pursuant to the Credit Agreement. 

Section 9.    Severability. In case one or more provisions of this Agreement or the other Loan
Documents shall be invalid, illegal or unenforceable in any respect under any applicable Legal Requirement, the validity, legality, and enforceability of the remaining provisions contained herein or therein shall not be affected or impaired thereby.

 Section 10.    Governing Law. This Agreement shall be governed by, and construed and enforced
in accordance with, the laws of the State of New York; provided that, the Administrative Agent, each L/C Issuer, the Swing Line Lender and each Lender shall retain all rights arising under applicable federal law. 

Section 11.    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. 

[Signature pages follow.] 

  
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 IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be executed by their
respective officers thereunto duly authorized effective as of the Effective Date. 
  

			
	BORROWER:
	
	 PATTERSON-UTI ENERGY,
INC.

		
	 By:
	 	 /s/ John E. Vollmer III

		 	 John E. Vollmer III

		 	Senior Vice President—Corporate Development, Chief Financial Officer and Treasurer
	
	GUARANTORS:
	
	PATTERSON PETROLEUM LLC
	PATTERSON-UTI DRILLING COMPANY LLC
	PATTERSON-UTI MANAGEMENT SERVICES, LLC
	UNIVERSAL WELL SERVICES, INC.
	UNIVERSAL PRESSURE PUMPING, INC.
	DRILLING TECHNOLOGIES 1 LLC
	DRILLING TECHNOLOGIES 2 LLC
	WARRIOR RIG TECHNOLOGIES US LLC

 
			
		
	Each by:	 	 /s/ John E. Vollmer III

		 	John E. Vollmer III
		 	Senior Vice President—Corporate Development, Chief Financial Officer and Treasurer

 Signature page to Amendment No. 4 to Credit Agreement 

(Patterson-UTI Energy, Inc.) 

 
			
	ADMINISTRATIVE AGENT/LENDER/L/C ISSUER/SWING LINE LENDER/LENDERS:
	
	WELLS FARGO BANK, N.A.,
	as the Administrative Agent, an L/C Issuer, the Swing Line Lender and a Lender
		
	By:	 	 /s/ Shannon Cunningham

	Name:	 	Shannon Cunningham
	Title:	 	Vice President

 Signature page to Amendment No. 4 to Credit Agreement 

(Patterson-UTI Energy, Inc.) 

 
			
	THE BANK OF TOKYO-MITSUBISHI UFJ, LTD., as a Lender
		
	By:	 	 /s/ Stephen W. Warfel

	Name:	 	 Stephen W. Warfel

	Title:	 	 Managing Director

 Signature page to Amendment No. 4 to Credit Agreement 

(Patterson-UTI Energy, Inc.) 

 
			
	 REGIONS BANK,
 as a
Lender

		
	By:	 	  

	Name:	 	  

	Title:	 	  

 Signature page to Amendment No. 4 to Credit Agreement 

(Patterson-UTI Energy, Inc.) 

 
			
	 COMERICA BANK,
 as a
Lender

		
	By:	 	 /s/ S John Castellano

	Name:	 	 S John Castellano

	Title:	 	 SVP

 Signature page to Amendment No. 4 to Credit Agreement 

(Patterson-UTI Energy, Inc.) 

 
			
	 U.S. BANK, NATIONAL ASSOCIATION,

as a Lender

		
	By:	 	 /s/ Patrick Jeffrey

	Name:	 	Patrick Jeffrey
	Title:	 	Vice President

 Signature page to Amendment No. 4 to Credit Agreement 

(Patterson-UTI Energy, Inc.) 

 
			
	 BANK OF AMERICA, N.A.,

as a Lender and an L/C Issuer

		
	By:	 	 /s/ Tyler Ellis

	Name:	 	Tyler Ellis
	Title:	 	Director

 Signature page to Amendment No. 4 to Credit Agreement 

(Patterson-UTI Energy, Inc.) 

 
			
	 HSBC BANK USA, N.A.,

as a Lender

		
	By:	 	 /s/ Michael Bustios

	Name:	 	 Michael Bustios

	Title:	 	 Vice President, 20556

 Signature page to Amendment No. 4 to Credit Agreement 

(Patterson-UTI Energy, Inc.) 

 
			
	 SUMITOMO MITSUI BANKING CORPORATION,

as a Lender

		
	By:	 	/s/ Katsuyuki Kubo
	Name:	 	Katsuyuki Kubo
	Title:	 	Managing Director

 Signature page to Amendment No. 4 to Credit Agreement 

(Patterson-UTI Energy, Inc.) 

 
			
	 THE BANK OF NOVA SCOTIA,

as a Lender

		
	By:	 	 /s/ John Frazell

	Name:	 	 John Frazell

	Title:	 	 Director

 Signature page to Amendment No. 4 to Credit Agreement 

(Patterson-UTI Energy, Inc.) 

 
			
	 ZB, N.A. dba AMEGY BANK,

as a Lender

		
	By:	 	 /s/ Michael Threadgill

	Name:	 	 Michael Threadgill

	Title:	 	 Assistant Vice President

 Signature page to Amendment No. 4 to Credit Agreement 

(Patterson-UTI Energy, Inc.) 

 
			
	 BOKF, NA dba BANK OF TEXAS,

as a Lender

		
	By:	 	 /s/ Marian Livingston

	Name:	 	Marian Livingston
	Title:	 	SVP, Commercial Relationship Manager

 Signature page to Amendment No. 4 to Credit Agreement 

(Patterson-UTI Energy, Inc.) 

 
			
	 MERCANTIL COMMERCEBANK N.A.,

as a Lender

		
	By:	 	  

	Name:	 	  

	Title:	 	  

 Signature page to Amendment No. 4 to Credit Agreement 

(Patterson-UTI Energy, Inc.) 

 
			
	 UMB BANK, N.A.,
 as a
Lender

		
	By:	 	 /s/ JESS M. ADAMS

	Name:	 	 JESS M. ADAMS

	Title:	 	 VICE PRESIDENT

 Signature page to Amendment No. 4 to Credit Agreement 

(Patterson-UTI Energy, Inc.) 

 
			
	 BANK OF TAIWAN, LOS ANGELES BRANCH,

as a Lender

		
	By:	 	  

	Name:	 	  

	Title:	 	  

 Signature page to Amendment No. 4 to Credit Agreement 

(Patterson-UTI Energy, Inc.) 

 
			
	CHANG HWA COMMERCIAL BANK LTD., LOS ANGELES BRANCH, as a Lender

		
	By:	 	  

	Name:	 	  

	Title:	 	  

 Signature page to Amendment No. 4 to Credit Agreement 

(Patterson-UTI Energy, Inc.) 

 
			
	 E.SUN COMMERCIAL BANK, LTD.,

LOS ANGELES BRANCH,
 as a
Lender

 
			
		
	By:	 	  

	Name:	 	  

	Title:	 	  

 Signature page to Amendment No. 4 to Credit Agreement 

(Patterson-UTI Energy, Inc.) 

 
			
	 MEGA INTERNATIONAL COMMERCIAL BANK CO., LTD. NEW YORK BRANCH,

as a Lender

		
	By:	 	  

	Name:	 	  

	Title:	 	  

 Signature page to Amendment No. 4 to Credit Agreement 

(Patterson-UTI Energy, Inc.) 

 
			
	 MEGA INTERNATIONAL COMMERCIAL BANK, CO., LTD. SILICON VALLEY BRANCH,

as a Lender

		
	By:	 	  

	Name:	 	  

	Title:	 	  

 Signature page to Amendment No. 4 to Credit Agreement 

(Patterson-UTI Energy, Inc.) 

 SCHEDULE 1.01(B) 

EXISTING SEVENTY SEVEN 

LETTERS OF CREDIT 
  

									
	 Issuer
	 	 Beneficiary
	 	 L/C Number
	 	 Expiry Date
	 	 Balance

	 Bank of America,

N.A.
	 	 CHIPPEWA

COUNTY DEPARTMENT
 OF LAND
	 	3119159	 	 1/27/18

Evergreen
 with annual

auto-renew
	 	$81,000
					
	 Wells Fargo Bank,

N.A.
	 	 STARR

INDEMNITY &
 LIABILITY
CO
	 	IS0205609U	 	 8/15/17

(annual auto-
 renew)
	 	$10,933,003
					
	 Wells Fargo Bank,

N.A.
	 	 LIBERTY

MUTUAL
 INSURANCE COMPANY
	 	IS0383283U	 	 2/11/18

Evergreen
 with annual

auto-renew
	 	$4,500,000
					
	 Wells Fargo Bank,

N.A.
	 	WEX BANK	 	IS0428294U	 	5/31/17	 	$450,000
					
	 Wells Fargo Bank,

N.A.
	 	 CAPITOL

INDEMNITY
 CORP AND/OR PLATTE RIVER
INSURANCE COMPANY
	 	IS0442430U-A	 	 7/21/17

Evergreen
 with annual

auto-renew
	 	$37,453

 Schedule 1.01(b)EX-10.2

 Exhibit 10.2 

Execution Version 

COMMITMENT INCREASE AGREEMENT 

This COMMITMENT INCREASE AGREEMENT (“Agreement”) dated as of April 20, 2017 (“Effective Date”), is
by and among Patterson-UTI Energy, Inc., a Delaware corporation (“Borrower”), the subsidiaries of the Borrower party hereto (together with the Borrower, the “Loan Parties”),
the undersigned Lenders party hereto (the “Increasing Lenders”), and Wells Fargo Bank, N.A., as administrative agent (in such capacity, the “Administrative Agent”) for the Lenders, as the issuer of letters of credit
under the Credit Agreement referred to below (in such capacity, an “L/C Issuer”), and as the swing line lender under the Credit Agreement referred to below (in such capacity, the “Swing Line Lender”). 

RECITALS 

A.     Reference is hereby made to that certain Credit Agreement dated as of September 27, 2012 among the Borrower,
the Administrative Agent, each L/C Issuer, the Swing Line Lender and the financial institutions party thereto from time to time, as lenders (the “Lenders”), as amended, supplemented or otherwise modified by that certain Amendment
No. 1 to Credit Agreement dated as of January 9, 2015, Amendment No. 2 to Credit Agreement dated as of July 8, 2016, Amendment No. 3 to Credit Agreement dated as of January 17, 2017, Amendment No. 4 to Credit
Agreement dated as of April 20, 2017 and the Commitment Increase Agreement dated as of January 24, 2017 (the “January 2017 Increase Agreement”), each among the Borrower, subsidiaries of the Borrower party thereto, the
Administrative Agent, each L/C Issuer, the Swing Line Lender and the financial institutions party thereto (as so amended, the “Credit Agreement”). 

B.     The Borrower has requested that certain Lenders increase their respective Revolving Credit Commitments pursuant to
Section 2.14 of the Credit Agreement, subject to the terms and conditions set forth herein. 
 NOW THEREFORE, in consideration of the
premises and the mutual covenants, representations and warranties contained herein, and for other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the parties hereto agree as follows: 

Section 1.    Defined Terms; Interpretation and Provisions. As used in this Agreement, each of the
terms defined in the opening paragraph and the Recitals above shall have the meanings assigned to such terms therein. Each term defined in the Credit Agreement, as amended hereby, and used herein without definition shall have the meaning assigned to
such term in the Credit Agreement, as amended hereby, unless expressly provided to the contrary. Article, Section, Schedule, and Exhibit references are to Articles and Sections of and Schedules and Exhibits to this Agreement, unless otherwise
specified. The words “hereof”, “herein”, and “hereunder” and words of similar import when used in this Agreement shall refer to this Agreement as a whole and not to any particular provision of this Agreement. The term
“including” means “including, without limitation”. Paragraph headings have been inserted in this Agreement as a matter of convenience for reference only and it is agreed that such paragraph headings are not a part of this
Agreement and shall not be used in the interpretation of any provision of this Agreement. 

Section 2.    Increase in Revolving Credit Commitments. 

(a)    Pursuant to Section 2.14 of the Credit Agreement, each Increasing Lender hereby agrees and acknowledges that
its respective Revolving Credit Commitment shall, automatically and without any further action, upon satisfaction of the conditions precedent set forth in Section 2(b), be increased on the Commitment Increase Date (as defined below), and on
the Commitment Increase Date, 

 
after giving effect to this Section 2(a), its Revolving Credit Commitment shall be the amount set forth next to its respective name under the caption “Revolving Credit
Commitment” on Schedule 2.01 attached hereto. Additionally, on the Commitment Increase Date, after giving effect to each of this Section 2(a) and the January 2017 Increase Agreement, Schedule 2.01 of the Credit Agreement
(Commitments and Applicable Percentages) shall be replaced in its entirety with Schedule 2.01 attached hereto. The parties hereto agree and acknowledge that the increase in Revolving Credit Commitments effected hereby are
in addition to, and not in lieu of, the increase in Revolving Credit Commitments effected under the January 2017 Increase Agreement. 

(b)    The increase to the Revolving Credit Commitments of the Increasing Lenders pursuant to Section 2(a) shall
become effective and enforceable against the parties hereto upon the occurrence of the following conditions precedent (the date such conditions are satisfied, “Commitment Increase Date”): 

(1)    the receipt by the Administrative Agent of a new Revolving Credit Note executed by a duly authorized officer of
the Borrower payable to each Increasing Lender and reflecting such Increasing Lender’s revised Revolving Credit Commitment as set forth on Schedule 2.01 attached hereto; 

(2)    evidence satisfactory to the Administrative Agent that the Borrower has effected an issuance of common Equity
Interests after January 24, 2017 but on or prior to May 31, 2017 and that the Borrower has received gross equity issuance proceeds of not less than $300,000,000 from such issuance (the “Equity Raise”); 

(3)    evidence satisfactory to the Administrative Agent that (A) the merger of a wholly-owned subsidiary of
Borrower with and into Seventy Seven Energy Inc. (“Seventy Seven”), with Seventy Seven continuing as the surviving entity and a wholly-owned subsidiary of Borrower, pursuant to that certain Agreement and Plan of Merger, dated
December 12, 2016, by and among Borrower, Pyramid Merger Sub, Inc. and Seventy Seven (the “Seventy Seven Merger”), has been consummated, (b) the credit facility evidenced by that certain Amended and Restated Credit
Agreement among Seventy Seven, certain of its subsidiaries and affiliates, the lenders party thereto, Wells Fargo Bank, National Association as administrative agent, joint lead arranger, joint lead book runner and
co-documentation agent, and Bank of America, N.A. as joint lead arranger, joint lead book runner and co-documentation agent dated as of August 1, 2016, as it may
have been amended (the “Seventy Seven Facility”) and all obligations to extend credit thereunder have been terminated and all obligations of the obligors (other than (i) obligations with respect to letters of credit so long as
such obligations have been cash collateralized in a manner and subject to documentation satisfactory to the issuers of such letters of credit or such letters of credit have been deemed or otherwise constitute Letters of Credit issued under the
Credit Agreement pursuant to documentation satisfactory to the issuers of such letters of credit and the Administrative Agent and (ii) contingent indemnification obligations and other contingent obligations not then due) with respect thereto
have been paid in full, and (c) arrangements have been made for the release of the liens and security interests granted under the Seventy Seven Facility; 

(4)    the receipt by the Administrative Agent of a certificate of each Loan Party dated as of the Commitment Increase
Date signed by a Responsible Officer of such Loan Party (i) certifying and attaching the resolutions adopted by such Loan Party approving or consenting to this Agreement and the increase in the Revolving Credit Facility pursuant to Section
2(a) above, and (ii) in the case of the Borrower, certifying that, before and after giving effect to such increase, (A) the representations and warranties contained in Article V of the Credit Agreement and the other Loan Documents are
true and correct on and as of the Commitment Increase Date, except to the extent that such representations and warranties specifically refer to an earlier date, in which case they are true and correct

  
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as of such earlier date, and except that for purposes of Section 2.14 of the Credit Agreement, the representations and warranties contained in subsections (a) and (b) of
Section 5.05 of the Credit 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 Credit Agreement, and (B) no Default exists; provided,
that if one certificate that meets the requirements of this Section 2(b)(4) and Section 2(b)(4) of the January 2017 Increase Agreement is delivered to the Administrative Agent, such certificate shall satisfy the requirements of this Section 2(b)(4);

 (5)    the receipt by the Administrative Agent of a certificate dated as of the Commitment Increase Date, signed by
a Responsible Officer of the Borrower certifying that (A) the Equity Raise has occurred and noting the date such Equity Raise occurred (which date must be no earlier than January 24, 2017 and no later than May 31, 2017) and certifying
that the Borrower has received at least $300,000,000 of gross equity issuance proceeds therefrom, (B) the Seventy Seven Merger has been consummated and (C) the Seventy Seven Facility and all obligations to extend credit thereunder have
been terminated and all obligations of the obligors (other than (i) obligations with respect to letters of credit so long as such obligations have been cash collateralized in a manner and subject to documentation satisfactory to the issuers of
such letters of credit or such letters of credit have been deemed or otherwise constitute Letters of Credit issued under the Credit Agreement pursuant to documentation satisfactory to the issuers of such letters of credit and the Administrative
Agent and (ii) contingent indemnification obligations and other contingent obligations not then due) with respect thereto have been paid in full; provided, that if one certificate that meets the requirements of this Section 2(b)(5) and Section
2(b)(5) of the January 2017 Increase Agreement is delivered to the Administrative Agent, such certificate shall satisfy the requirements of this Section 2(b)(5); 

(6)    the receipt by the Administrative Agent of an opinion of counsel to the Borrower as to the corporate (or
partnership or limited liability company) authorization of the Borrower and the Guarantors of the increase in the Revolving Credit Facility, which such opinion as to corporate authorization will be substantively in the form delivered on the Closing
Date and otherwise in form and substance reasonably acceptable to the Administrative Agent; provided, that if one opinion of counsel that meets the requirements of this Section 2(b)(6) and Section 2(b)(6) of the January 2017 Increase Agreement is
delivered to the Administrative Agent, such opinion shall satisfy the requirements of this Section 2(b)(6); and 

(7)    evidence satisfactory to the Administrative Agent of the payment in full by the Borrower of the upfront fees
required to be paid under Section 5(b) below. 
 Notwithstanding anything herein to the contrary, if all of the conditions set forth
in this Section 2(b) are not satisfied by 5:00 p.m. (Houston, Texas time) on May 31, 2017, then Section 2(b) and the increase in the Aggregate Revolving Credit Commitments contemplated thereby shall be null and
void and of no force and effect. 
 Section 3.    Loan Parties’ Representations and
Warranties. The Borrower acknowledges, represents, warrants and agrees as to itself and all other Loan Parties, and each other Loan Party acknowledges, represents, warrants and agrees as to itself, that: (a) after giving effect
to this Agreement, the representations and warranties contained in the Credit Agreement, as amended hereby, and the representations and warranties contained in the other Loan Documents are true and correct in all material respects on and as of the
Effective Date and on the date hereof as if made on as and as of such date except to the extent that any such representation or warranty expressly relates solely to an earlier date, in which case such representation or warranty is true and correct
in all material respects as of such earlier date; (b) the execution, delivery and performance of this Agreement are within the limited liability company or corporate power and authority of such Loan Party and have been duly authorized by
appropriate limited 

  
 3 

 
liability company and corporate action and proceedings; (c) this Agreement constitutes the legal, valid, and binding obligation of such Loan Party enforceable in accordance with its terms,
except as limited by applicable bankruptcy, insolvency, reorganization, moratorium, or similar laws affecting the rights of creditors generally and general principles of equity, and no portion of the Obligations are subject to avoidance,
subordination, recharacterization, recovery, attack, offset, counterclaim, or defense of any kind; (d) there are no governmental or other third party consents, licenses and approvals required to be made or obtained by it in connection with its
execution, delivery, performance, validity and enforceability of this Agreement; (e) no Defaults or Events of Default shall have occurred and be continuing; and (f) since the date of the financial statements most recently delivered
pursuant to Section 6.01(a) of the Credit Agreement, there has been no event or circumstance, either individually or in the aggregate, that has had or could reasonably be expected to have a Material Adverse Effect. 

Section 4.    Conditions to Effectiveness. This Agreement shall become effective on the
Effective Date and enforceable against the parties hereto upon the occurrence of the following conditions precedent: 

(a)    the receipt by the Administrative Agent of multiple original counterparts of this Agreement executed and delivered
by duly authorized officers of the Borrower, the Guarantors, the Administrative Agent, and the Increasing Lenders; and 

(b)    evidence satisfactory to the Administrative Agent of the payment in full by the Borrower of all the fees and
expenses required to be paid as of or on the Effective Date by Section 10.04 of the Credit Agreement or any other provision of a Loan Document to the extent invoiced prior to the Effective Date. 

Section 5.    Acknowledgments and Agreements. 

(a)    Each Loan Party acknowledges that on the date hereof all outstanding Obligations are payable in accordance with
their terms and each Loan Party waives any defense, offset, counterclaim or recoupment with respect thereto. The Administrative Agent, each L/C Issuer, the Swing Line Lender and the Increasing Lenders hereby expressly reserve all of their rights,
remedies, and claims under the Loan Documents. Nothing in this Agreement shall constitute a waiver or relinquishment of (i) any Default or Event of Default under any of the Loan Documents, (ii) any of the agreements, terms or conditions
contained in any of the Loan Documents, (iii) any rights or remedies of the Administrative Agent, each L/C Issuer, or any Lender with respect to the Loan Documents, or (iv) the rights of the Administrative Agent, each L/C Issuer, the Swing
Line Lender or any Lender to collect the full amounts owing to them under the Loan Documents. 
 (b)    In consideration
of the agreements of the Increasing Lenders, the Borrower agrees to pay to the Administrative Agent, for the account of each Increasing Lender, upfront fees in an amount equal to 0.50% of the positive difference between (a) such Increasing
Lender’s Revolving Credit Commitment immediately after giving effect to Section 2(a) and the increase in Revolving Credit Commitments contemplated therein and (b) such Increasing Lender’s Revolving Credit Commitment after giving
effect to the January 2017 Increase Agreement and the increase in Revolving Credit Commitments contemplated therein and immediately prior to giving effect to Section 2(a) and the increase in Revolving Credit Commitments contemplated therein;
provided, that such upfront fees shall only be due and payable on the Commitment Increase Date.  

(c)    The Borrower, each Guarantor, Administrative Agent, each L/C Issuer, Swing Line Lender and each Increasing Lender
does hereby adopt, ratify, and confirm the Credit Agreement, as amended hereby, and acknowledges and agrees that the Credit Agreement, as amended hereby, is and 

  
 4 

 
remains in full force and effect, and the Borrower and the Guarantors acknowledge and agree that their respective liabilities and obligations under the Credit Agreement, as amended hereby, and
the Guaranty, are not impaired in any respect by this Agreement. 
 (d)    From and after the Effective Date, all
references to the Credit Agreement and the Loan Documents shall mean the Credit Agreement and such Loan Documents as amended by this Agreement. 

(e)    This Agreement is a Loan Document for the purposes of the provisions of the other Loan Documents. 

(f)    Effective as of the Commitment Increase Date, the Borrower hereby names The Bank of Nova Scotia as a Joint Lead
Arranger and Co-Syndication Agent with respect to the facility evidenced by the Credit Agreement. Notwithstanding foregoing and notwithstanding anything herein or in the Credit Agreement to the contrary, The
Bank of Nova Scotia as Joint Lead Arranger and Co-Syndication Agent shall not have any powers, duties or responsibilities under this Agreement, the Credit Agreement or any of the other Loan Documents, except
in its capacity as a Lender. 
 Section 6.    Reaffirmation of the Guaranty. Each Guarantor
party hereto hereby ratifies, confirms, acknowledges and agrees that its obligations under the Guaranty are in full force and effect and that such Guarantor continues to unconditionally and irrevocably guarantee the full and punctual payment, when
due, whether at stated maturity or earlier by acceleration or otherwise, all of the Guaranteed Obligations (as defined in the Guaranty), and its execution and delivery of this Agreement does not indicate or establish an approval or consent
requirement by such Guarantor under the Guaranty, in connection with the execution and delivery of amendments, consents or waivers to the Credit Agreement or any of the other Loan Documents. 

Section 7.    Counterparts. This Agreement may be signed in any number of counterparts, each of
which shall be an original and all of which, taken together, constitute a single instrument. This Agreement may be executed by facsimile signature or other electronic imaging means, and all such signatures shall be effective as originals. 

Section 8.    Successors and Assigns. This Agreement shall be binding upon and inure to the
benefit of the parties hereto and their respective successors and assigns permitted pursuant to the Credit Agreement. 

Section 9.    Severability. In case one or more provisions of this Agreement or the other Loan
Documents shall be invalid, illegal or unenforceable in any respect under any applicable Legal Requirement, the validity, legality, and enforceability of the remaining provisions contained herein or therein shall not be affected or impaired thereby.

 Section 10.    Governing Law. This Agreement shall be governed by, and construed and enforced
in accordance with, the laws of the State of New York; provided that, the Administrative Agent, each L/C Issuer, the Swing Line Lender and each Lender shall retain all rights arising under applicable federal law. 

Section 11.    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. 

  
 5 

 THERE ARE NO UNWRITTEN ORAL AGREEMENTS AMONG THE PARTIES. 

[Signature pages follow.] 

  
 6 

 IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be executed by their
respective officers thereunto duly authorized effective as of the Effective Date. 
  

			
	BORROWER:
	
	 PATTERSON-UTI ENERGY,
INC.

		
	 By:
	 	 /s/ John E. Vollmer III

		 	 John E. Vollmer III

		 	Senior Vice President—Corporate Development, Chief Financial Officer and Treasurer
	
	GUARANTORS:
	
	PATTERSON PETROLEUM LLC
	PATTERSON-UTI DRILLING COMPANY LLC
	PATTERSON-UTI MANAGEMENT SERVICES, LLC
	UNIVERSAL WELL SERVICES, INC.
	UNIVERSAL PRESSURE PUMPING, INC.
	DRILLING TECHNOLOGIES 1 LLC
	DRILLING TECHNOLOGIES 2 LLC
	WARRIOR RIG TECHNOLOGIES US LLC

 
			
		
	 Each by:
	 	 /s/ John E. Vollmer III

		 	 John E. Vollmer III

		 	Senior Vice President—Corporate Development, Chief Financial Officer and Treasurer

 Signature page to Commitment Increase Agreement 

(Patterson-UTI Energy, Inc.) 

 
			
	ADMINISTRATIVE AGENT/LENDER/L/C ISSUER/SWING LINE LENDER/LENDERS:
	
	WELLS FARGO BANK, N.A.,
	as the Administrative Agent, an L/C Issuer, and the Swing Line Lender

 
			
		
	By:	 	 /s/ Robert Corder

	Name:	 	Robert Corder
	Title:	 	Director

 Signature page to Commitment Increase Agreement 

(Patterson-UTI Energy, Inc.) 

 
			
	 U.S. BANK NATIONAL ASSOCIATION,

as an Increasing Lender

		
	By:	 	 /s/ Patrick Jeffrey

	Name:	 	Patrick Jeffrey
	Title:	 	Vice President

 Signature page to Commitment Increase Agreement 

(Patterson-UTI Energy, Inc.) 

 
			
	 BOKF, NA DBA BANK OF TEXAS,

as an Increasing Lender

		
	By:	 	 /s/ Marian Livingston

	Name:	 	Marian Livingston
	Title:	 	SVP, Commercial Relationship Manager

 Signature page to Commitment Increase Agreement 

(Patterson-UTI Energy, Inc.) 

 SCHEDULE 2.01 

COMMITMENTS 
 AND
APPLICABLE PERCENTAGES 
  

							
	 Lender
	  	Revolving Credit
Commitment	  	Initial Applicable
Percentage (Revolving
Credit Facility)	 	Extending Lender
				
	Wells Fargo Bank, National Association	  	$100,000,000.00	  	15.815485997%	 	YES
				
	Bank of America, N.A.	  	$75,000,000.00	  	11.861614497%	 	YES
				
	The Bank of Nova Scotia	  	$65,000,000.00	  	10.280065898%	 	YES
				
	The Bank of Tokyo-Mitsubishi UFJ, Ltd.	  	$64,583,333.33	  	10.214168039%	 	YES
				
	Regions Bank	  	$64,583,333.33	  	10.214168039%	 	NO
				
	U.S. Bank National Association	  	$50,000,000.00	  	7.907742998%	 	YES
				
	Comerica Bank	  	$36,041,666.67	  	5.700164745%	 	YES
				
	BOKF, NA dba Bank of Texas	  	$35,000,000.00	  	5.535420099%	 	YES
				
	HSBC Bank USA, N.A.	  	$29,166,666.67	  	4.612850083%	 	YES
				
	Sumitomo Mitsui Banking Corporation	  	$29,166,666.67	  	4.612850083%	 	NO
				
	ZB, N.A. dba Amegy Bank	  	$22,916,666.67	  	3.624382208%	 	YES
				
	Mercantil Commercebank N.A.	  	$12,500,000.00	  	1.976935750%	 	NO
				
	UMB Bank, N.A.	  	$12,500,000.00	  	1.976935750%	 	YES
				
	Bank of Taiwan, Los Angeles Branch	  	$8,333,333.33	  	1.317957166%	 	NO
				
	Chang Hwa Commercial Bank Ltd., Los Angeles Branch	  	$8,333,333.33	  	1.317957166%	 	NO
				
	E.Sun Commercial Bank, Ltd., Los Angeles Branch	  	$8,333,333.33	  	1.317957166%	 	NO
				
	Mega International Commercial Bank Co., Ltd. New York Branch	  	$6,666,666.67	  	1.054365734%	 	NO
				
	Mega International Commercial Bank Co., Ltd. Silicon Valley Branch	  	$4,166,666.67	  	0.658978584%	 	NO
				
	Total	  	$632,291,666.67	  	100%	 	77.53%

 Schedule 2.01

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