1 EXHIBIT 21.1 BJ SERVICES COMPANY SUBSIDIARIES AS OF DECEMBER 20, 1996 PERCENTAGE OWNED BY ---------------------- NAME OF ENTITY/JURISDICTION OF ORGANIZATION COMPANY SUBSIDIARY - - ------------------------------------------------------------------------ ------- ---------- BJ Services Company Middle East (Delaware).............................. 100% Gulf Well Services Company (Kuwait) (Joint Venture)................... 40% BJ Services Company Overseas (Delaware) (Inactive)...................... 100% BJ Services Company, U.S.A. (Delaware).................................. 100% Western Petroleum Services International Company (Delaware)........... 100% Western Petroleum Services International Nigeria Ltd. (Nigeria) (Joint Venture)................................................... 60% P.T. Western Petroleum Servindo (Indonesia)........................ 100% Western Rotary Petroleum Services Ltd. KFT (Hungary) (Joint Venture).......................................................... 64% Western Oceanic (Nigeria) Limited (Nigeria) (Joint Venture)........... 60% Colony Drilling Company Limited (Scotland)............................ 100% Western Oceanic, Inc. (Delaware)...................................... 100% Western Oceanic International, Inc. (Panama)....................... 100% BJ Process and Pipeline Services Company (Texas)...................... 100% Pipeline Cleaners Inc. (Iowa)...................................... 100% Mercury Fracturing Service, Inc. (Texas) (being liquidated)........... 100% Service Fracturing Company (Oklahoma) (being liquidated).............. 100% Enerex Supply Company, Inc. (Texas) (being liquidated)................ 100% BJ Service International, Inc. (Delaware)............................... 100% BJ-Hughes C.I., Ltd. (Cayman Islands) (Inactive)...................... 100% BJ Oilwell Services (Malaysia) Sdn.Bhd. (Joint Venture)............... 65% BJ Oilwell Service International (Thailand) Ltd....................... 100% BJ Service Arabia Ltd. (Saudi Arabia) (Joint Venture)................. 70% BJ Services C.I., Ltd. (Cayman Islands)............................... 100% Nowsco U.K. Limited (UK).............................................. 100% Nowsco Well Service Limited (UK)................................... 100% McKenna J. Sullivan Limited (UK)................................. 100% Nowsco (UK) Group Limited (Scotland)............................... 100% Nowsco Well Service GmBH (Germany).................................... 100% Nowsco Norge AS (Norway).............................................. 100% Nowsco Well Service (S.E. Asia) Pte. Ltd. (Singapore)................. 100% Nowsco Well Service SRL (Italy) (being liquidated).................... 100% Nowsco Well Service Ltd. (Alberta).................................... 100% Nowsco Well Service (Ireland) Limited.............................. 100% International NOWSCO Well Service, Inc. (Texas)(being merged)...... 100% Nowsco Well Service Company Limited (Barbados)..................... 100% Nowsco Well Service International (Bermuda)........................ 100% Barritz Overseas Limited (Cyprus).................................. 100% Nowsco International Limited (Barbados)............................ 100% Nowsco Well Service (Cyprus) Limited............................... 100% Nowsco Well Service (Vostok) Limited (Russia).................... 100% NMS Oil Field Limited (Cyprus)..................................... 100% Nowsco America S.A. (Argentina).................................... 100% Nowsco Well Service (Europe) BV (Netherlands)...................... 100% 2 PERCENTAGE OWNED BY ---------------------- NAME OF ENTITY/JURISDICTION OF ORGANIZATION COMPANY SUBSIDIARY - - ------------------------------------------------------------------------ ------- ---------- Nowsco (Netherlands) Group BV...................................... 100% BJ Tubular Services B.V. (Netherlands)............................. 100% Nowsco (UAE) LLC (being liquidated) (Joint Venture)................ 49% PT Nowsco Well Service (Indonesia) (Joint Venture).................... 70% Nowsco (B) SDN BHD (Brunei) (Joint Venture)........................... 60% Sarku Nowsco Well Services SDN BHD (Malaysia) (Joint Venture)......... 40% BJ Services Company B.V. (Netherlands).................................. 100% BJ Services Company GmbH (Germany).................................... 100% BJ Services AS (Norway)............................................... 100% BJ Services Company Italia S.r.1. (Italy)............................. 100% BJ Services Company Mexicana S.A. de C.V. (Mexico)...................... 100% BJ Services Company (Nigeria) Limited (Joint Venture)................... 60% BJ Services Company S.A. (Panama)....................................... 100% BJ Services Company Limited (Scotland).................................. 100% BJ Petroleum Services Company (UK) Limited (England).................. 100% BJ Services Company (UK) Limited (Scotland)........................... 100% BJ Services International Limited (Scotland)....................... 100% BJ Leasing Company Limited (Scotland)................................. 100% BJS Oilfield Technology Limited (Scotland)............................ 100% BJ COMTEC AS (Norway).............................................. 100% BJS Oilfield Technology A/S (Denmark).............................. 100% BJ Services Company (Australia) Pty. Ltd. (Australia)................. 100% BJ Services Company (Singapore) Pte. Ltd. (Singapore)................... 100% BJ Services De Venezuela IV, C.A. (Venezuela)........................... 100% BJ Services de Venezuela, C.A. (Venezuela).............................. 100% BJ Services De Venezuela II, C.A. (Venezuela)......................... 100% BJ Services De Venezuela III, C.A. (Venezuela)..................... 100% BJ Services International S.A. (Panama)................................. 100% BJ Pumping Services Company S.A. (Panama) (Joint Venture)............. 65% International Chemical Specialties FZE (Jebel Ali).................... 100% SEBEP (Servicios Brasileiros Especializados em Petroleo S.A.) (Brazil)........................................................... 100% SEBEP Quimica Industria e Comercio Ltda. (Brazil).................. 100% SEBEX Oil Well Services, S.A. (Brazil)............................. 100% BJ Services S.A. (Argentina).......................................... 100% Compania de Servicios Petroleros BJ Boliviana S.A. (BJ Boliviana S.A.) (Bolivia) (Joint Venture)................................... 49% Hughes Services Eastern Hemisphere S.A.R.L. (France).................. 100% International Specialty Chemicals Ltd. (Cayman Islands) (Joint Venture)........................................................... 75% P.T. BJ-Hughes Services Indonesia (Indonesia) (Joint Venture)......... 75% Societe Algerienne de Puits Producteurs d'Hydrocarbures (BJSP) (Algeria).......................................................... 49%