PARKER DRILLING COMPANY, as the Issuer, EACH OF THE GUARANTORS PARTY HERETO, as Guarantors and THE BANK OF NEW YORK TRUST COMPANY, N.A. (successor in interest to JPMORGAN CHASE BANK NATIONAL ASSOCIATION), as Trustee FIRST SUPPLEMENTAL INDENTURE Dated...

Exhibit 4.3

XXXXXX DRILLING COMPANY,
as the Issuer,

EACH OF THE GUARANTORS PARTY HERETO,
as Guarantors

and

THE BANK OF NEW YORK TRUST COMPANY, N.A. (successor in interest to
JPMORGAN CHASE BANK NATIONAL ASSOCIATION),
as Trustee

FIRST SUPPLEMENTAL INDENTURE

Dated as of November 8, 2006

Supplementing the Indenture dated as of October 10, 2003

9 5/8% Senior Notes due 2013

FIRST SUPPLEMENTAL INDENTURE

     FIRST SUPPLEMENTAL INDENTURE, dated as of November 8, 2006, among XXXXXX DRILLING COMPANY, a Delaware corporation (the “Company”), the subsidiary guarantors party to the Indenture (as defined herein) (the “Guarantors”), Xxxxxx Intex, LLC, a Delaware limited liability company (“LLC 1”), Xxxxxx Drilltech, LLC, a Delaware limited liability company (“LLC 5”), Xxxxxx Drillserv, LLC, a Delaware limited liability company (“LLC 6”), Xxxxxx Drillex, LLC, a Delaware limited liability company (“LLC 7”), Xxxxxx Rigsource, LLC, a Delaware limited liability company (“LLC 9”), Xxxxxx Drilling Eurasia, Inc., a Delaware corporation (“US NewCo 1”), and Xxxxxx Drilling Pacific Rim, Inc., a Delaware corporation (“US NewCo 2”) (LLC 1, LLC 5, LLC 6, LLC 7, LLC 9, US NewCo 1 and US NewCo 2 being collectively referred to as the “New Guarantors”), and THE BANK OF NEW YORK TRUST COMPANY, N.A. (successor in interest to JPMORGAN CHASE BANK NATIONAL ASSOCIATION), as trustee (the “Trustee”).

RECITALS OF THE COMPANY AND THE GUARANTORS

     WHEREAS, the Company, the Guarantors and the Trustee have executed and delivered an Indenture dated as of October 10, 2003, among the Company, the Guarantors and the Trustee (the “Indenture”), for the benefit of one another and for the equal and ratable benefit of the Holders of the Company’s 9 5/8% Senior Notes due 2013 (the “Notes”);

     WHEREAS, the Company has acquired or invested in the New Guarantors, and each of the New Guarantors meets the definition of “Restricted Subsidiary” contained in the Indenture;

     WHEREAS, pursuant to Section 11.05 of the Indenture, each New Guarantor shall execute and deliver a supplemental indenture pursuant to which such New Guarantor shall become a Guarantor and guarantee the obligations of the Company under the Indenture and the Notes;

     WHEREAS, Section 9.01(g) of the Indenture provides that the Company, the Guarantors and the Trustee may supplement the Indenture, without the consent of any Holder of a Note, to add any Restricted Subsidiary as an additional Guarantor as set forth in Section 11.05 of the Indenture;

     WHEREAS, the execution and delivery of this First Supplemental Indenture has been duly authorized by resolution of the board of directors of the Company and the Guarantors, and the managers or the boards of directors of each of the New Guarantors, as applicable, has authorized this First Supplemental Indenture and the guarantee of the obligations of the Company under the Indenture and the Notes; and

     WHEREAS, all conditions and requirements necessary to make this First Supplemental Indenture valid and binding upon the Company, the Guarantors and the New Guarantors and enforceable against the New Guarantors in accordance with its terms, have been performed and fulfilled;

     NOW, THEREFORE, in consideration of the above premises, each of the parties hereto agrees, for the benefit of one another and for the equal and ratable benefit of the Holders of the Notes, as follows:

     Section 1. Certain Terms Defined in the Indenture. All capitalized terms used and not otherwise defined herein shall have the meanings ascribed to them in the Indenture.

     Section 2. Additional Guarantors; Guarantee. Each New Guarantor, by execution and delivery of this First Supplemental Indenture, hereby agrees to be bound by the terms of the Indenture as a Guarantor.

     Section 3. Effectiveness. This First Supplemental Indenture shall become effective upon:

          (a) the execution and delivery of this First Supplemental Indenture by the Company, the Guarantors, the New Guarantors and the Trustee; and

          (b) the delivery by the Company to the Trustee of the Opinion of Counsel and Officers’ Certificate pursuant to Section 11.05 of the Indenture.

     Section 4. Supplemental Indenture Part of Indenture. Except as expressly supplemented hereby, all of the terms, conditions and provisions of the Indenture shall remain in full force and effect. This First Supplemental Indenture shall form a part of the Indenture for all purposes and every Holder of Notes heretofore or hereafter authenticated and delivered shall be bound hereby.

     Section 5. Trustee Makes No Representation.

     (a) The recitals of the Company and the Guarantors contained herein shall be taken as the statements of the Company and the Guarantors, and the Trustee assumes no responsibility for their correctness. The Trustee makes no representation as to the validity or sufficiency of this First Supplemental Indenture.

     (b) The Trustee accepts the trusts hereunder and agrees to perform the same, but only upon the terms and conditions set forth in the Indenture.

     Section 6. Counterpart Originals. The parties may sign any number of copies of this First Supplemental Indenture. Each signed copy shall be an original, but all of them together shall represent the same agreement.

     Section 7. Headings. The headings of the Sections of this First Supplemental Indenture, which have been inserted for convenience of reference only, are not to be considered a part of this First Supplemental Indenture and shall in no way modify or restrict any of the terms or provisions hereof.

     Section 8. Governing Law. The validity and interpretation of this First Supplemental Indenture shall be governed by and construed in accordance with the laws of the state of New York, but without giving effect to applicable principles of conflicts of law to the extent that the application of the law of another jurisdiction would be required thereby.

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     Section 9. Binding Effect. All covenants and agreements in this First Supplemental Indenture by the Company or by any of the Subsidiary Guarantors shall bind their successors and assigns, whether so expressed or not.

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     IN WITNESS WHEREOF, the parties hereto have caused this First Supplemental Indenture to be executed as of the day and year first above written.

	XXXXXX DRILLING COMPANY
	By:		/s/ Xxxxxx X. Xxxxxx
		Name:	Xxxxxx X. Xxxxxx
		Title:	Vice President, General Counsel & Corporate Secretary

Signature Page — First Supplemental Indenture to 2003 Indenture

	GUARANTORS:
	Anachoreta, Inc. Canadian Rig Leasing, Inc. Choctaw International Rig Corp. Creek International Rig Corp. DGH, Inc. Indocorp of Oklahoma, Inc. Pardril, Inc. Xxxxxx Aviation, Inc. Xxxxxx Drilling (Kazakstan), LLC Xxxxxx Drilling Company Eastern Hemisphere, Ltd. Xxxxxx Drilling Company International, LLC Xxxxxx Drilling Company International Limited Xxxxxx Drilling Company Limited LLC Xxxxxx Drilling Company North America, Inc. Xxxxxx Drilling Company of Argentina, Inc. Xxxxxx Drilling Company of Bolivia, Inc. Xxxxxx Drilling Company of New Guinea, LLC Xxxxxx Drilling Company of Niger Xxxxxx Drilling Company of Oklahoma, Incorporated Xxxxxx Drilling Company of Singapore, LLC Xxxxxx Drilling Company of South America, Inc. Xxxxxx Drilling Offshore Corporation Xxxxxx Drilling Offshore International, Inc. Xxxxxx North America Operations, Inc. Xxxxxx Technology, Inc. Xxxxxx Technology, LLC Xxxxxx USA Drilling Company Xxxxxx-VSE, Inc. Quail USA, LLC Selective Drilling Corporation Universal Rig Service LLC
	By:	/s/ Xxxxx X. Xxxxxx
		Xxxxx X. Xxxxxx
		Vice President

Signature Page — First Supplemental Indenture to 2003 Indenture

	Xxxxxx Drilling Company of Mexico, LLC Xxxxxx Drilling Offshore USA, LLC
	By:	/s/ Xxxxx X. Xxxxxx
		Xxxxx X. Xxxxxx
		Vice President

	Xxxxxx Drilling Management Services, Inc.
	By:	/s/ Xxxxx X. Xxxxxx
		Xxxxx X. Xxxxxx
		President

	Xxxxxx Offshore Resources, L.P.
	By:	/s/ Xxxxx X. Xxxxxx
		Xxxxx X. Xxxxxx
		President, Xxxxxx Drilling Management Services, Inc., General Partner

	Xxxxxx Tools, LLC
	By:	/s/ Xxxxx XxXxxxx
		Xxxxx XxXxxxx
		President

	Xxxxxx USA Resources, LLC
	By:	/s/ Xxxxx XxXxxxx
		Xxxxx XxXxxxx
		President

Signature Page — First Supplemental Indenture to 2003 Indenture

	PD Management Resources, L.P.
	By:	/s/ Xxxxx X. Xxxxxx
		Xxxxx X. Xxxxxx
		President, Xxxxxx Drilling Management Services, Inc., General Partner

	Quail Tools, LP
	By:	/s/ Xxxxx X. Xxxxxx
		Xxxxx X. Xxxxxx
		Vice President, Quail USA, LLC, General Partner

	NEW GUARANTORS:
	Xxxxxx Intex, LLC Xxxxxx Drilltech, LLC
	By:	/s/ Xxxxxx X. Xxxxxx
		Xxxxxx X. Xxxxxx
		Vice President

	Xxxxxx Drillserv, LLC Xxxxxx Rigsource, LLC
	By:	/s/ Xxxxxx X. Xxxxxxxxxx
		Xxxxxx X. Xxxxxxxxxx
		Vice President

Signature Page — First Supplemental Indenture to 2003 Indenture

	Xxxxxx Drillex, LLC Xxxxxx Drilling Eurasia, Inc. Xxxxxx Drilling Pacific Rim, Inc.
	By:	/s/ Xxxxx X. Xxxxxx
		Xxxxx X. Xxxxxx
		Vice President

Signature Page — First Supplemental Indenture to 2003 Indenture

	THE BANK OF NEW YORK TRUST COMPANY, N.A., (successor in interest to JPMORGAN CHASE BANK NATIONAL ASSOCIATION) as Trustee
	By:	/s/ Xxxxx X. Xxxxx
		Name:	Xxxxx X. Xxxxx
		Title:	Vice President

Signature Page — First Supplemental Indenture to 0000 Xxxxxxxxx