Exhibit 21.1
PRECISION DRILLING CORPORATION
SUBSIDIARIES
| Name of Subsidiary |
State or Jurisdiction of Organization | |
| 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 DRILLING (BARBADOS) LTD. |
BARBADOS | |
| GREY WOLF DRILLING B.V. |
NETHERLANDS | |
| GREY WOLF DRILLING SERVICES COOPERATIEF U.A. |
NETHERLANDS | |
| GREY WOLF GLOBAL EMPLOYMENT CORPORATION |
ALBERTA | |
| GREY WOLF (US) GLOBAL EMPLOYMENT COMPANY |
TEXAS | |
| 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 | |
| GREY WOLF SERVICES (IRAQ SOUTH) LIMITED |
CYPRUS | |
| GW DRILLING LIMITED |
CAYMAN ISLANDS | |
| GW IMPORTACIONES, S. DE R.L. DE C.V. |
MEXICO | |
| GW INTERNATIONAL OILFIELD SERVICIOS LTD. |
ALBERTA | |
| INTER LEASING, INC. |
BRITISH VIRGIN ISLANDS | |
| INTER-TECH DRILLING SOLUTIONS (BARBADOS) LTD. |
BARBADOS | |
| KENTING INC. |
DELAWARE | |
| MURCO DRILLING CORPORATION |
DELAWARE | |
| NORJET GEOTECHNOLOGIES (OVERSEAS) LIMITED |
CYPRUS | |
| NORTHLAND ENERGY SERVICES (CYPRUS) LIMITED |
CYPRUS | |
| NORWEST WIRELINE SERVICES (OVERSEAS) LIMITED |
CYPRUS | |
| PD SUPPLY INC. |
TEXAS | |
| PERFORACIONES ANDINAS, S.A. |
PANAMA | |
| 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 | |
| SERVICIOS GREY WOLF S. DE R.L. DE C.V. |
MEXICO | |
| SIERRA DRILL MANUFACTURING LTD. |
ALBERTA | |