EX-21.1 11 d277141dex211.htm EXHIBIT 21.1

Exhibit 21.1

Exhibit 21.1

PRECISION DRILILNG CORPORATION

SUBSIDIARIES

Name of Subsidiary		State or Jurisdiction of Organization
1198430 ALBERTA LTD.		ALBERTA
1443518 ALBERTA LTD.		ALBERTA
31795 YUKON INC.		YUKON
ARROWSTAR DRILLING PARTNERSHIP		ALBERTA
AXIS DIRECTIONAL DRILLING CORP.		TEXAS
BK LOG CO. LTD.		RUSSIAN FEDERATION
CANADIAN WASTE MANAGEMENT INC.		ALBERTA
CK LOG OVERSEAS LIMITED		CYPRUS
COMPUTALOG (CYPRUS) LIMITED		CYPRUS
COMPUTALOG CONSULTING CYPRUS LIMITED		CYPRUS
COMPUTALOG MEXICANA, S.A. de C.V.		MEXICO
COMPUTALOG OCEANWAVES SDN. BHD.		MALAYSIA
DI ENERGY, INC.		TEXAS
DI/PERFENSA INC.		TEXAS
DRILLERS INC., D.I. DE VENEZUELA, C.A.		VENEZUELA
GREY WOLF DRILLING DE VENEZUELA, C.A.		VENEZUELA
GREY WOLF DRILLING INTERNATIONAL LTD.		CAYMAN ISLANDS
GREY WOLF DRILLING LIMITED		CYPRUS
GREY WOLF GLOBAL EMPLOYMENT CORPORATION		ALBERTA
GREY WOLF INTERNATIONAL DE MEXICO, S. DE R.L. DE C.V.		MEXICO
GREY WOLF INTERNATIONAL DRILLING CORPORATION		CANADA
GREY WOLF INTERNATIONAL, INC.		TEXAS
GREY WOLF MEXICO HOLDINGS LLC		NEVADA
GREY WOLF OILFIELD SERVICES (KSA) LIMITED		CYPRUS
GREY WOLF OILFIELD SERVICES LIMITED		CYPRUS

Name of Subsidiary		State or Jurisdiction of Organization
GREY WOLF SERVICES (IRAQ SOUTH) LIMITED		CYPRUS
GREY WOLF SUPPLY INC.		TEXAS
GW IMPORTACIONES, S. DE R.L. DE C.V.		MEXICO
INTER LEASING, INC.		BRITISH VIRGIN ISLANDS
INTER-TECH DRILLING SOLUTIONS (BARBADOS) LTD.		BARBADOS
KENTING DRILLING SERVICES LIMITED		UNITED KINGDOM
KENTING INC.		DELAWARE
MURCO DRILLING CORPORATION		DELAWARE
NORJET GEOTECHNOLOGIES (OVERSEAS) LIMITED		CYPRUS
NORTHLAND ENERGY SERVICES (CYPRUS) LIMITED		CYPRUS
NORWEST WIRELINE SERVICES (OVERSEAS) LIMITED		CYPRUS
PERFORACIONES ANDINAS, S.A.		PANAMA
PERITUS INTERNATIONAL OILFIELD SERVICES LTD.		ALBERTA
PRECISION BOLTING, INC.		CALIFORNIA
PRECISION COMPLETION & PRODUCTION SERVICES LTD.		DELAWARE
PRECISION DIRECTIONAL SERVICES LTD.		ALBERTA
PRECISION DIRECTIONAL SERVICES, INC.		TEXAS
PRECISION DIVERSIFIED OILFIELD SERVICES CORP.		ALBERTA
PRECISION DRILLING (US) CORPORATION		TEXAS
PRECISION DRILLING CANADA LIMITED PARTNERSHIP		ALBERTA
PRECISION DRILLING COMPANY, LP		TEXAS
PRECISION DRILLING HOLDINGS COMPANY		NEVADA
PRECISION DRILLING LLC		LOUISIANA
PRECISION DRILLING, INC.		DELAWARE
PRECISION EMPLOYMENT SERVICES CORP.		ALBERTA
PRECISION LIMITED PARTNERSHIP		ALBERTA
PRECISION OILFIELD PERSONNEL SERVICES LTD.		ALBERTA
SERVICIOS GREY WOLF S. DE R.L. DE C.V.		MEXICO
SIERRA DRILL MANUFACTURING LTD.		ALBERTA