2012 iADC Membership Directory Contractor Headquarters

Headquarter Locations of IADC Contractor Members IADC contractor members represent the vast majority of companies For complete addresses, phone and fax numbers, Internet addresses, worldwide who own or operate oil-and-gas and geothermal drill- and names of key personnel of individual contractors, please see the ing units, whether on land or offshore. The listing below provides alphabetical listing of drilling contractors. contractor headquarter locations alphabetically by country and city.

ALGERIA CANADA FRANCE New Delhi Deepwater Drilling & Industries Hassi Messaoud Saskatchewan Guyancourt Cedex Ltd Entreprise Nationale Des Regina Stauber Drilling Inc Dietswell S.a. Deepwater Drilling & Services Travaux Aux Puits Pvt Ltd Alberta Maisse Oil And Natural Gas wilaya de Ouargla Cofor Corporation Limited S.a.r.l. Inc. Il Nuovo Castoro Calgary Quippo Oil & Gas Infrastructure Algerie Ensign Energy Services Inc. Paris Ltd Saxon Energy Services Inc Caroil Sas Shiv-vani Oil & Gas Exploration Services Ltd. ARGENTINA Simmons Group Inc Trinidad Drilling GERMANY Buenos Aires INDONESIA Dls Argentina Limited CAYMAN ISLANDS Celle Estrella International Energy Hekla Energy Gmbh Jakarta Services Grand Cayman Itag - Tiefbohr Gmbh Pt Apexindo Pratama Duta Tbk Quintana Wellpro S.a. Pyramid Drilling International Pt Indrillco Bakti Ltd Deggendorf AUSTRALIA Drilltec Gut Gmbh Grossbohr - IRAQ CHINA Und Umwelttechnik Queensland Baghdad Mittenwalde See P R China, p.26 Iraq Drilling Company (idc) Untergrundspeicher- Und Richlands Geotechnologie-systeme Mb Century Drilling Pty Ltd Basrah CROATIA Gmbh Brisbane Office Al-safeer Engineering Group For General Contracts & Oil Zagreb Toowoomba Services Crosco Integrated Drilling & HUNGARY Easternwell Group Well Services Co. Ltd. Budapest IRELAND South Australia Central European Drilling Ltd CYPRUS Dundalk Adelaide Kovagoszolos Meehan Drilling Ltd Ensign International Energy Limassol Rotaqua Geological, Mining, Songa Offshore Services Pty Limited Drilling, Research Ltd Isle of Man Hahndorf CZECH REPUBLIC Nagykanizsa John Nitschke Drilling Pty Ltd Rotary Drilling Company Ltd CHALLENGER LIMITED Luzice Lonsdale Mnd Drilling & Services A.s. ICELAND ITALY Hunt Energy & Mineral Co Australia Pty Ltd Prague Kopavogur Allessandria Eriell Corporation S.r.o. Iceland Drilling Co Hydro Drilling International AZERBAIJAN Spa DENMARK INDIA Baku Cesena Caspian Drilling Company Ltd Petreven Copenhagen Ahmedabad Gulf Drilling Supply Fze Branch Maersk Drilling Deep Industries Limited In Azerbaijan Cortemaggiore Socar-aqs Perazzoli Drilling Egmore Aban Offshore Limited Milano BERMUDA Saipem Spa Egyptian Drilling Company Gujarat Hamilton Sino Tharwa Drilling Company Aakash Exploration Services Pvt Parma Nabors Industries Ltd. Valve And Tools Sae Ltd Pergemine S.p.a. Gtc Oilfield Services Private BRAZIL Giza Limited JAPAN Sdf Oilwell Technology John Energy Limited Rio de Janeiro Gurgaon Tokyo Bch Energy Services EL SALVADOR Jindal Drilling & Industries Ltd. Japan Drilling Co. Ltd. Lupatech Oil & Gas Services South West Pinnacle Mantle Quest Japan Company Ltd Petroserv S/a Santa Tecla Exploration Pvt. Ltd. Queiroz Galvão Óleo E Gás S. A. Perforadora Santa Bárbara S.a. JORDAN De C.v. Kolkata BRITISH VIRGIN ISLANDS Sitaram Energy And Logistics Ltd Amman ENGLAND Arab Gulf Oilfield Equipments United Contractors For Oil & Mumbai (agc) Gas Nottingham Drillco Drilling Services Equipment Sales And Service Boldon Drilling Essar Oilfield Services India Company (essco) BRUNEI Limited Site Group Co. Ltd. Great Offshore Limited Amrtur Corporation Sdn Bhd Greatship (india) Limited 25 Contractor Headquarters 2012 iADC Membership Directory

KAZAKHSTAN NIGERIA Ningxia Wolomin Scp Oilfield Services (yinchuan) Exploration Oil & Gas Jaslo Ltd. Aktobe Lagos Co Ltd Naftgaz Branch In Wolomin Akpan Limited Liability Nigerblossom Drilling Company Partnership Kazakhstan Ltd Shandong Zielona Gora Oando Energy Services Limited Shandong Rongli Oil & Gas Exploration “diament” Almaty Machinery Co., Ltd Ltd Mhindustry Llp Port Harcourt Sun Drilling Llp Acme Energy Integrated Services Shanxi QATAR Interglobal Technologies Ltd HAIMO OILFIELD SERVICES CO, LTD Shaanxi Shengli Highland Mangistau Lonestar Drilling Nigeria Limited Doha Drilling Engineering Co Ltd Xibu Drilling Engineering Tasaniola Nigeria Limited Gulf Drilling International Company (aktau) Tianjin Energy Resources Ltd Limited (q.s.c.) Sichuan Honghua Oil & Gas Engineering KOREA Warri Delta Marine Oil Services Nig Ltd And Technology Services ROMANIA Sichuan Co Ltd Gyeonggi-do Honghua Oil & Gas Engineering Bucharest Korea NORWAY Services Limited Foradex Sa Romanian Association Of KUWAIT Bergen Tianjin Drilling Contractors - Acfr North Sea Drilling Group As Cnpc Bohai Drilling Engineering Rompetrol Sa Odfjell Drilling As Ahmadi Co., Ltd. Kuwait Drilling Company Constanta Oslo Urumqi S.c. Grup Servicii Petroliere S.a. Aker Oilfield Services Dasman Cnpc Xibu Drilling Engineering S.c. Rig Service S.a. Operations As Kuwait Well Drilling Co. W.l.l. Company Limited Sevan Drilling Asa Craiova Fahaheel Xinjiang S.c. Foraj Sonde S.a. Craiova - Stavanger Burgan Co; For Well Drilling, Xinjiang Beiken Energy Craiova Drilling Archer Limited Trading And Maintenance Engineering Co., Ltd Ocean Rig Asa Kscc Tirgu Mures Seadrill Management As Yan Jiao Sc Develtor Srl Kuwait City China Oilfield Services Ltd Stone Drilling Services Company OMAN Tirgu OCNA PAKISTAN Foserco Sa Azaiba Abraj Energy Services Llc Islamabad RUSSIA Tripoli Dewan Drilling Limited Bid Bid Arab Drilling & Workover Mari Gas Company Limited Astrakhan Cactus Petroleum & Energy Llc Company Bke Shelf Ltd Karachi Muscat Nuricon Petroservices (pte) Ltd Izhevsk MALAYSIA Gulf Energy Llc Llc “izhdril - Service” National Drilling & Services Kuala Lumpur Company Llc PERU Moscow Kst Drilling Technologies Sdn Association Of Drilling Lima Bhd Seeb Contractors Energy Services Del Peru S.a.c. Umw Standard Drilling Sdn. Bhd. Mb Petroleum Services Llc Bke (burovaya Kompaniya Eurasia) Drilling Company Llc Selangor PHILIPPINES Png Drilling Co. Ltd. Handrill Sdn Bhd P R CHINA Saag Drilling And Well Services Beijing Pasig City Sdn Bhd Beijing Huayou Xingye Energy Thermaprime Well Services Inc Investment Co., Ltd Dhahran Taguig City MAURITIUS Beijing Petrolor Oilfield Saudi Arabian Oil Company Energy Development Services Co., Ltd (saudi Aramco) Corporation Port Louis China Newstar Energy Co Ltd Saudi Aramco Essar Oilfields Services Limited (cnec) Mega (mineral Exploration & Geo Analysis) Philippines, Inc. Hilong Oil Service & Eng Co., Ltd SINGAPORE MEXICO Sinopec International Petroleum Service POLAND Corporation Singapore Mexico City Cosl Drilling Pan-pacific Ltd Cracow Perforadora Central, S.a. De C.v. Frigstad Offshore Pte Ltd Chengdu Oil & Gas Exploration Company Jasper Offshore Cnpc Chuanqing Drilling Cracow Ltd. MOLDOVA Engineering Company Limited Sun Drilling Pte Ltd Triumph Drilling (ccdc) Jaslo Chisinau Oil & Gas Exploration Company Ascom Grup S.a. Daqing Jaslo, Ltd. SPAIN Daqing Drilling & Exploration NEW ZEALAND Engineering Corporation Krosno Madrid Zaklad Robot Gorniczych Sondagens De Angola Ltda Porirua Hong Kong Krosno Sp. Z O.o. Sonpetrol Espana, S.a. Webster Drilling & Exploration China New Star Petroleum Ltd Drilling Services Co., Limited Pila Hong Kong Offshore Oil Oil And Gas Drilling Company Services Limited “nafta” Ltd

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SWITZERLAND Momentum Engineering Llc Rio Vista Crowley Nps Paul Graham Drilling & Service Guichard Operating Company Baar Selective Marine Services Llc Company Inc. Noble Corporation Strata Oilfield Services Weatherford Drilling Santa Barbara Houma Vernier International A Division Of Pr Field Services Inc Blake International Usa Rigs, Llc Transocean Management Ltd Weatherford Santa Rosa Jena Sharjah Thermasource Justiss Oil Co., Inc. SYRIA Hallworthy Shipping Ltd S.a Wayneridge Offshore Inc Llc Signal Hill Lafayette Damascus Signal Hill Petroleum, Inc. Crown Drilling, Inc. Anwar Akkad Sons Company UNITED KINGDOM Moncla Marine Operations, Llc/ Limited (united Oil Inc) Simi Valley Moncla Drilling Operations, Wamar International Llc Llc Aberdeen Riceland Drilling Company THAILAND Dolphin Drilling Ltd. Colorado Kca Deutag Drilling Group MISSISSIPPI Bangkok Stena Drilling Ltd. Denver Aztec Int’l. Ltd. Tor Drilling (uk) Ltd Emas Energy Services (thailand) Excell Services Llc Natchez Stoneham Drilling Corporation Energy Drilling Company Ltd Basingstoke Larchford Limited Siracha Hawaii Michigan Mermaid Drilling Limited Derbyshire: Honolulu Marion P.r. Marriott Drilling Limited Water Resources International Pollister Drilling Corp THE NETHERLANDS Inc. London Mt. Pleasant Den Helder Ensco Plc Idaho Bigard & Huggard Drilling Inc Swift Drilling Bv Sheffield Boise South Boardman Groningen Geometric Cofor Ltd Td Well Service, Llc Advanced Energy Services L.l.c. Overseas Drilling Ltd USA Illinois Mississippi TRINIDAD & TOBAGO ALASKA Carmi Brandon Rousillac George N. Mitchell Drilling Performance Drilling Company, Sadhna Petroleum Services Anchorage Company Inc. Llc Company Limited Doyon Drilling Inc Les Wilson Inc. Nordic Calista Services Jackson Trincity Solstenxp Indiana Rapad Drilling & Well Service Althev Oilfield Services Ltd. Inc. Jackson, Mississippi Office Kenai Vincennes Trinidad Inlet Drilling Alaska Inc Pioneer Oil Field Services Missouri Well Services Petroleum Company Ltd. ARKANSAS Washington Fredericktown Gwaltney Drilling Inc Pense Bros. Drilling Co. Inc. TURKEY Conway Desoto Drilling Inc Kansas Nevada Ankara Magnolia Bordrill Drilling Contractor Ellinwood Henderson Mike Rogers Drilling Company And Trade Corp Southwind Drilling, Inc Barbour Corporation Inc. Guney Yildizi Petrol Uretim Sondaj Muteahhitlik Ve Tic., Hays New Mexico Arizona A.s. (gyp) Discovery Drilling Co., Inc. Turkish Petroleum Int. Co. Ltd. Artesia Chandler Pratt Jw Drilling Inc Layne Christensen Istanbul Sterling Drilling Company Silver Oak Drilling, Llc Viking International Arkansas Rush Center Aztec H. D. Drilling, Llc Aztec Well Servicing Company El Dorado Inc. Sewell Drilling Llc WaKeeney Abu Dhabi W W Drilling Llc Bloomfield Abu Dhabi General Maintenance Magnolia L & W Drilling Inc And Petroleum Services Co. Reliance Well Service Inc. Wichita (admasco) Story Services, Inc. Duke Drilling Co., Inc. Hobbs Almansoori - Key Energy Services H-40 Drilling Inc. Mcvay Drilling Company Llc Rogers Murfin Drilling Co. Inc. National Drilling Company Jb Hunt Gas & Oil Drilling, Llc Pickrell Drilling Company, Inc. Roswell Val Energy Inc United Drilling Inc Ajman California Zenith Drilling Corporation Global Rig Services Fzc North Dakota Bakersfield Louisiana Dubai Golden State Drilling Inc Dickinson Dalma Energy, Llc Baton Rouge Paramount Drilling Us Llc Eta Star Holdings Ltd Oilfield Brawley Gator-dawg Drilling, Llc Services Division Geodrill Llc Ohio Feipco Amatco Petroleum For Oil Broussard Services Orcutt Axxis Drilling Rittman Global Petro Tech Kenai Drilling Corporate Office Superior Energy Services H.a.d., Inc. Ks Drilling Pte Ltd

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Oklahoma Austin Prospector Support Services, Inc Windthorst Pinnergy, Ltd Romfor International Ltd Steinberger Drilling Company Dewey Rowan Companies Inc. Ltd. Blue Ribbon Drilling, Llc Bellaire Scandrill Inc. Corporate Office Big E Drilling Co Div Of Eastham Sidewinder Drilling Inc The Woodlands El Reno Enterprises Vantage Drilling Company Savanna Drilling Nomac Drilling Corporation Well Ops (a Helix Energy Stoneham Drilling Corporation Big Spring Solutions Company) Virginia Robinson Drilling Of Texas, Ltd. Xtreme Drilling & Coil Services, Enid Inc. Cedar Bluff Lamunyon Drilling Llc Boerne Gasco Drilling Inc Drilling Risk Management, Inc. Kilgore Oklahoma City Independent Drilling Clintwood Brent Baker Drilling Inc. Breckenridge Highlands Drilling, Llc Cactus Drilling Company, Llc Badger Rotary Drilling Llc Longview Canyon Drilling Company Tec Well Service, Inc. Rosedale Kal Drilling Company Columbus Cody Energy Services, Inc Lariat Services Inc. Sandridge Black Creek Drilling Inc Lubbock Energy Inc. Norton Energy Drilling Vansant Corpus Christi Noah Horn Well Drilling Inc Purcell Coastal Drilling Company, L.l.c. Midland Akerman Construction Co, Inc Orion Drilling Company, Llc Basic Energy Services, L.p. West Virginia Dba Horizontal Well Drillers Big Dog Drilling Co. Dallas Bison Drilling & Field Services Charleston Seminole Advanced Drilling Technologies Canelson Drilling (us) Inc Performance Drilling, Llc Acacia Drilling Company Lp Llc Mattlock Drilling Lp Wholly Owned By Jerry Scott Drilling, Llc Bearcat Drilling L.l.c. Patriot Drilling Llc Performance Energy Partner Rod Ric Corporation Stillwater Denton Western Drilling, Inc Wyoming Keen Energy Services B & B Rig Builders Llc Odessa Casper Tonkawa Dripping Springs Academy Drilling Dhs Drilling Company Equilibria Energy Services, Llc 5-w Drilling Services Inc Capstar Drilling, Inc Sst Energy Corporation Lantern Drilling Co True Drilling L.l.c. Tulsa Fort Worth Viking Drilling Llc Helmerich & Payne International Swanson Drilling Company, Llc Gillette Drilling Co. Txd Services, Lp San Angelo Cyclone Drilling Inc. Latshaw Drilling & Exploration Union Drilling Inc. Sendero Drilling Company Mac Drilling, Inc Company Unit Drilling Company Fresno San Antonio Riverton Wisco-moran Drilling Company Pioneer Drilling Company Range Drilling Woodward Corporate Office Atlas Drilling, Llc Gainesville VENEZUELA Pistol Drilling, Llc Felderhoff Brothers Drilling Seguin Power Rig, Llc Kaler Oil Company Longhorn Drilling & Equipment Maturin Co Comanpa, C.a. Pennsylvania Graham E & H Drilling Company Seminole Exton Faith Drilling L.l.c. VIETNAM Def-com Energy Houston Amromco Energy Llc Spring Ho Chi Minh City Mt Morris Atwood Oceanics, Inc. Pinpoint Drilling And Petrovietnam Drilling And Well Yost Drilling, Llc Bassdrill Management (usa) Inc Directional Services, Llc Services Corporation Bayou Well Services Warren Big 6 Drilling Company Stafford WEST INDIES Papco, Inc. Diamond Offshore Drilling, Inc. Zk Drilling Co Llc Global Interests, Llc Trinidad Washington Hercules Offshore, Inc Stamford Lennox Petroleum Services Crown Drilling Llc Independence Contract Drilling Gem Drilling Co. Limited Mesa Drilling Inc. Texas Nicklos Drilling Company Tye Noram Drilling Company Ringo Drilling I, Lp YEMEN Abilene Northern Offshore Ltd Bandera Drilling Co., Inc. Pacific Drilling Van Sana’a Heart Land Drilling, Inc. Parker Drilling Company Roco Drilling & Service Inc. Delta Engineering Company, Ltd  Patterson-uti Drilling Company Albany Llc Wichita Falls Stasney Well Service Precision Drilling Oilfield Aquila Drilling Co Lp Services Corporation Mojo Drilling, Llc

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