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EXHIBIT 21.1

WEATHERFORD INTERNATIONAL LTD.
LIST OF SUBSIDIARIES AND AFFILIATES

NAME JURISDICTION

315613 Alberta Ltd. Alberta
708621 Alberta Ltd. Alberta
721260 Alberta Ltd. Alberta
A-1 Bit & Tool Co., B.V. Netherlands
Aim Oil Tools, Inc. Texas
Air Drilling Services Bolivia S.R.L. Bolivia
Air Drilling Services Columbia Limited Colombia
Air Drilling Services de Venezuela, C.A. Venezuela
Air Drilling Services France (SARL) France
Algerian Oilfield Services S.p.A. Algeria
Alpine Oil Services (Cyprus) Ltd. Mexico
Alpine Oil Services Inc. Cyprus
Alpine Oil Services International Ltd. North Dakota
Ampscot Overseas Petroleum Equipment Co., LLC Barbados
Ancil S.A.I.C. Oman
Aosi BV Argentina
Aquatronic Limited Netherlands
Astec Developments Limited U.K.
Bakke Oil Tools AS U.K.
Bakke Oil Tools Middle East AS Norway
Bakke Technology AS Norway
Baktexas Norway
BBL Aust. Pty Ltd Azerbajan
BBL Downhole Tools Inc. Australia
BBL Downhole Tools Limited Texas
BBL Eastern Canada Incorporated U.K.
BD Kendle Engineering Limited Alberta
Bit & Tool A-1 S.r.l. U.K.
BOSS Oilfield Services Limited Italy
Brit Bit Limited U.K.
Calumet Petroleum Services, Inc. U.K.
Cardium International Limited Venezuela
Cardium Investments (Barbados) Limited Hong Kong
Cardium Tool International Limited Barbados
Clearwater International, L.L.C. Barbados
Columbia Petroleum Services Corp. Delaware
Communication Rentals Limited Delaware
Contra-Shear Separation Technologies U.K.
CRC-Evans Automatic Welding, Inc. New Zealand
CRC-Evans Pipeline International (UK) Limited Texas

CRC-Evans Services Limited U.K.
CTC Empresa Tecnica e Comercial de Equipamentos Ltda. U.K.
Dailey Asia-Pacific Pte. Ltd. Brazil
Dailey de Venezuela, S.A. Singapore
Dailey del Peru S.A. Venezuela
Dailey Environmental Remediation Technologies, Inc. Peru
Dailey IDS Limited Texas
Dailey International Sales Corporation U.K.
Dalen Drilling Services Ltd. Delaware
Design Engineering Limited Alberta
Directional Wireline Engineering Services (Nigeria) Limited U.K.
Downhole Technology Limited Nigeria
Drill Stem Testers, Inc. U.K.
DST, Inc. USA
EMI-ElettroMagnetica Ispezioni Italia S.r.l. USA
Energy Ventures (Cyprus) Ltd. Italy
Energy Ventures Far East Limited Cyprus
Enterra (U.K.) Limited Hong Kong
Enterra International Limited U.K.
Enterra Oilfield Rentals Limited U.K.
Enterra Patco Oilfield Products, Inc. Hong Kong
Enterra Rental and Fishing Company Texas
eProduction Solutions U.K. Ltd. Delaware
eProduction Solutions, Inc. U.K.
Ercon, Inc. Texas
European Material Inspection (EMI) B.V. Delaware
EVI (Barbados), SRL Netherlands
EVI de Venezuela, S.A. Barbados
EVI Weatherford, Inc. Venezuela
Expio Limited Delaware
Fishing Services Limited U.K.
Gas Services International (Aust) Pty. Limited U.K.
Gas Services International (S) Pte. Ltd. Australia
Gas Services International (USA), Inc. Singapore
Gas Services International Limited Texas
General Pipe Service Bolivia S.R.L. British Virgin Islands
General Pipe Service, Inc. Bolivia
GL/95 Servicios, C.A. Panama
Global Air Drilling Services Ltd. Venezuela
Greenspan, Inc. Alberta
Houston Well Screen Asia Pte. Ltd. Texas
Houston Well Screen Company Singapore
Independent Integrated Services Limited Texas
International Nitrogen Services Canada Ltd. U.K.
International Nitrogen Services LLC Alberta
International Petroleum Equipment Limited Delaware

International Petroleum Equipment Norge A/S U.K.
International Petroleum Services, Inc. Norway
J. D. Investments Bonaire N.V. Delaware
J.D.I. Tool Works B.V. Netherlands Antilles
Johnson Filtration Systems Limited Netherlands
Johnson Filtration Systems SAS Ireland
Johnson Screens (Australia) Pty Ltd France
Johnson Screens (India) Limited Australia
Johnson Screens Japan Limited India
Johnson Screens Ltda. Japan
Johnson Screens Venezuela, C.A. Brazil
Johnson Screens, Inc. Venezuela
Keltic Oil Tools Limited Delaware
Kendle Engineering (Asia) Pte. Limited U.K.
Kobe International Ltd. Singapore
Kopp International Pipeline Services L.L.C. Bahamas
KSP Logistics Co. Ltd. Oman
Lavarone Commercial Servicing and Liquidity Management Limited Liability Thailand
McAllister Petroleum Services (Cyprus) Limited Hungary
McMurry-Macco (UK) Limited Cyprus
Mid-Europe Supply Limited U.K.
Morrison McLean Associates Limited U.K.
Multi Operational Service Tankers Inc. (M.O.S.T.) U.K.
Niagara Screen Products Limited Panama
Offshore Rentals Deutschland GmbH Ontario
Offshore Rentals Dubai LLC Germany
Offshore Rentals Limited U.A.E.
Offshore Rentals Norge A/S U.K.
Oil Field Rental Holdings Limited Norway
OilPatch Enterprises Internacional, S.A. de C.V. U.K.
Oilwell Production Services Limited Mexico
OptoPlan A.S. U.K.
Orwell Group De Venezuela C.A. Norway
Orwell Group Limited Venezuela
PETCO Fishing & Rental Tools (UK) Ltd. U.K.
Petroline Wellsystems Limited U.K.
Pipetest Service Sp.Zo.o. U.K.
Powell Engineering Company Limited Poland
Powerflo Rental (Dubai) LLC U.K.
Powerflo Rentals Limited U.A.E.
Powerflo Rentals Norge A/S U.K.
Powerflo Systems Limited Norway
PowerGEN Rentals Limited U.K.
PT AS/Johnson Screens (JV) Sdn Bhd U.K.
PT Gas Services Indonesia Brunei

PT Hawes Utama Indonesia Indonesia
PT Weatherford Indonesia Indonesia
PT Wira Insani Indonesia
Pump Rentals (International) Limited Indonesia
Pyrosul International Ltd. U.K.
Quality Commissioning Limited Alberta
Quality Machining Services Limited U.K.
R.S.T. Projects Limited U.K.
Recovery Systems Limited U.K.
Robison Services, Inc. U.K.
Schoeller-Bleckmann Motovilithinskije Sucker Rod Gmbh California
Shengli-Highland Company Ltd. Austria
Signa Engineering Corp. China
Specialty Testing & Consulting Ltd. Texas
Stealth Oil & Gas, Inc. Alberta
Subsurface Technology AS Delaware
SubTech, LLC Norway
Tank Rentals Limited Delaware
Tech Line Oil Tools Inc. U.K.
Techcorp Industries International, Inc. Delaware
Teco Maskinering AS Barbados
TUBAFOR MAROC S.A.R.L. Norway
Universal Compression Holdings, Inc. Morocco
USF Johnson and Mohammed Al Barwani LLC Delaware
Van der Horst U.S.A., Inc. Oman
Venstar, Inc. Delaware
W1 General Partner, Inc. Delaware
W1 Receivables, L.P. Delaware
Weatherford (B) Sdn. Bhd. Texas
Weatherford (Cyprus) Limited Brunei
Weatherford (Malaysia) Sdn. Bhd. Cyprus
Weatherford (Saudi Arabia) Ltd. Malaysia Jt. Venture
Weatherford (Thailand) Ltd. Saudi Arabia Jt. Venture
Weatherford Aarbakke AS Thailand
Weatherford Abu Dhabi, Ltd. Norway
Weatherford Artificial Lift Systems Canada Ltd. Cayman Islands
Weatherford Artificial Lift Systems, Inc. Alberta
Weatherford Asia Pacific Pte. Ltd. Delaware
Weatherford Australia Holding Pty. Limited Singapore
Weatherford Australia Pty. Ltd. Australia
Weatherford Bermuda Holdings Ltd. Australia
Weatherford Canada Ltd. Bermuda
Weatherford Canada Partnership Alberta
Weatherford Colombia Ltd. Alberta
Weatherford Completion Systems (UK) Limited British Virgin Islands
Weatherford Completion Systems de Venezuela, S.A. U.K.

Weatherford de Mexico S.A. de C.V. Venezuela
Weatherford del Peru S.R.L. Mexico
Weatherford DIS Manufacturing (UK) Limited Peru
Weatherford Drilling and Production Services (India) Private Limited U.K.
Weatherford Drilling Services, Inc. India
Weatherford East Europe Service GmbH Texas
Weatherford Ecuador S.A. Germany
Weatherford Equipment (Cyprus) Limited Ecuador
Weatherford ER Acquireco Inc. Cyprus
Weatherford ER Amalco, Inc. Alberta
Weatherford Eurasia B.V. Alberta
Weatherford Eurasia Limited Netherlands
Weatherford Financing (Luxembourg) S.a.r.l. U.K.
Weatherford Foreign Sales Corporation Luxembourg
Weatherford France SAS Barbados
Weatherford Hoevelaken France
Weatherford Holding (Gibraltar) Limited Netherlands
Weatherford Holding GmbH Gibraltar
Weatherford Industria e Comercio Ltda. Germany
Weatherford International de Argentina S.A. Brazil
Weatherford International, Inc. Argentina
Weatherford Investment (Gibraltar) Limited Delaware
Weatherford Investment (Luxembourg) S.a.r.l. Gibraltar
Weatherford Kazakhstan Limited Liability Partnership Luxembourg
Weatherford Kopp GmbH Kazakhstan
Weatherford KSP Company Limited Germany
Weatherford Latin America, Inc. Thailand
Weatherford Latin America, S.A. Panama
Weatherford Limited Partner, L.L.C. Venezuela
Weatherford Luxembourg S.a.r.l. Delaware
Weatherford Management, Inc. Luxembourg
Weatherford Mediterranea S.p.A. Delaware
Weatherford New Zealand Limited Italy
Weatherford Nigeria Limited New Zealand
Weatherford Norge A/S Nigeria
Weatherford Oil Tool GesmbH Norway
Weatherford Oil Tool GmbH Austria
Weatherford Oil Tool Middle East Ltd. Germany
Weatherford Oil Tool Nederland B.V. British Virgin Islands
Weatherford Oilfield Equipment (Shanghai) Co., Ltd. Netherlands
Weatherford Overseas Products, Ltd. China
Weatherford Overseas Services, Ltd. Cayman Islands
Weatherford Receivables, LLC Cayman Islands
Weatherford Services, Ltd. Delaware
Weatherford Services, S.A. Bermuda
Weatherford Shanghai Investment Co. Panama

Weatherford Solutions Sdn. Bhd. Delaware
Weatherford Subtech Nigeria Limited Malaysia
Weatherford Technical Services Limited Nigeria
Weatherford Trinidad Limited British Virgin Islands
Weatherford U.K. Limited Trinidad
Weatherford U.S. Holdings, L.L.C. U.K.
Weatherford U.S., L.P. Delaware
Weatherford/Al-Rushaid Co. Ltd. Louisiana
Weatherford/Bin Hamoodah Saudi Arabia Jt. Venture
Weatherford/Lamb, Inc. Abu Dhabi Jt. Venture
Wellserv Limited Delaware
West Coast International Oilfield Rentals, B.V. U.K.
WEUS Holding, Inc. Netherlands
WI Products & Equipment, Inc. Delaware
WII Rental Company Cayman Islands
WUS Holding, L.L.C. Delaware
Delaware