UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

NOTICE OF EFFECTIVENESS

Effective Date: May 17, 2011
Form: F-4
CIK: 0001013605
Company Name: PRECISION DRILLING Corp
File Number: 333-173926
CIK: 0001518024
Company Name: Precision Drilling Oilfield Services Corp
File Number: 333-173926-17
CIK: 0001518141
Company Name: Precision Oilfield Personnel Services Ltd.
File Number: 333-173926-16
CIK: 0001518144
Company Name: Precision Limited Partnership
File Number: 333-173926-15
CIK: 0001517999
Company Name: Grey Wolf Supply Inc.
File Number: 333-173926-14
CIK: 0001518003
Company Name: Precision Completion & Production Services Ltd.
File Number: 333-173926-13
CIK: 0001518005
Company Name: Precision Directional Services, Inc.
File Number: 333-173926-12
CIK: 0001518023
Company Name: Precision Drilling, Inc.
File Number: 333-173926-11
CIK: 0001518146
Company Name: Grey Wolf International Drilling Corp
File Number: 333-173926-10
CIK: 0001518149
Company Name: Precision Drilling Canada Limited Partnership
File Number: 333-173926-09
CIK: 0001518150
Company Name: Precision Diversified Oilfield Services Corp.
File Number: 333-173926-08
CIK: 0001038893
Company Name: DI ENERGY, INC.
File Number: 333-173926-07
CIK: 0001243350
Company Name: DI/PERFENSA INC.
File Number: 333-173926-06
CIK: 0001038891
Company Name: GREY WOLF INTERNATIONAL, INC.
File Number: 333-173926-05
CIK: 0001064400
Company Name: MURCO DRILLING CORP
File Number: 333-173926-04
CIK: 0001243343
Company Name: Precision Drilling Co LP
File Number: 333-173926-03
CIK: 0001243347
Company Name: Precision Drilling Holdings Co
File Number: 333-173926-02
CIK: 0001243345
Company Name: Precision Drilling LLC
File Number: 333-173926-01
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