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Issued 20 June 2007

2007 ASP Participant List

Abercrombie RTD, Inc. ** Kenai Drilling Limited Arab Drilling & Workover Company (ADWOC) Korea (KNOC) Atlantic Oilfield Services Drilling Company Atwood Oceanics, Inc. Latshaw Drilling Company Axxis Drilling Leonard Hudson Drilling Company, Inc. Bandera Drilling Company, Inc. Maersk Contractors, Drilling Division Big "6" Drilling Company ** Mid Atlantic Well Service, Inc. ** Big E Drilling Company Moncla Well Service, Inc. BKE Shelf Ltd. (Formerly - Shelf LTD) Murfin Drilling Company, Inc. Boldon Drilling Nabors Industries, Ltd. Bronco Drilling Company LLC National Drilling & Services Company LLC Cactus Drilling Company LLC National Drilling Company Capstar Drilling, Inc. Nicklos Drilling Company CDX Resources, LLC (Formerly EXP-Express Drilling Noble Drilling Services Inc. Century Drilling, Ltd. Nomac Drilling Corporation Cheyenne Drilling, Inc. Norton Energy Drilling, LLC Coastal Drilling Company LLC Ocean Rig Comanpa, C.A. Oriental Oil Kish Compagnie Tunisienne de Forage Orion Drilling Company CROSCO Integrated Drilling & Well Service Co, Ltd Parker Drilling Company Crown DBL, Inc. Patterson - UTI Dalma Energy & Co LLC Paul Graham Drilling Company Diamond Offshore Drilling Company Performance Drilling, LLC ** Dolphin Drilling Ltd. Pexin S.A. ** Doyon Drilling, Inc. Pioneer Drilling Company Egyptian Drilling Company PNOC Corporation ** Elenburg Exploration, Inc. Precision Drilling Oilfield Services, Inc. Energy Drilling Company Premium Drilling Inc. ENSCO International Pride International Ensign International Energy Services, Inc. (South PT Universal Sodexho (formerly PT Universal Ogden Ensign International Energy Services, Inc. - (AU) PT. Apexindo Pratama Duta Tbk Ensign US Drilling, Inc. Rod Ric Corporation Felderhoff Drilling Rowan Companies, Inc. Forrest Drilling Company, LLC S.W. Jack Drilling Company Frontier Drilling, Inc. SAAG Drilling & Well Services Sdn. Bhd. Gem Drilling Company SPA George N. Mitchell Drilling Company, Inc. Saxon Energy Services Inc. GlobalSantaFe Corporation *** Scandrill, Inc. Goober Drilling LLC IPM-Rig Management Grey Wolf Drilling Company Scorpion Offshore Grup Servicii Petroliere Seadrill Management AS Gulf Drilling International Shamrock Drilling, Inc. Gwaltney Drilling, Inc. Shiv-Vani Oil & Gas Exploration Services Ltd. Hallworthy Shipping LTD SA Simmons Group Inc. Heart Land Drilling/Trucking Inc. Sino Tharwa Drilling Co. Helmerich & Payne International Songa Offshore Hercules Offshore Corporation SST Energy Corporation High Arctic Energy Services LLC ThermaSource, Inc. Inlet Drilling Alaska, Inc. International Engineering Company, SPA LP Itag Tiefbohr Union Drilling, Inc. Japan Drilling Company, Ltd. Unit Drilling Company Justiss Oil Company, Inc. Water Resources International, Inc. Kaler Oil Company ** Weatherford Drilling International (BVI) Ltd. KCA DEUTAG Drilling Well Services Company Ltd KCA DEUTAG Drilling GmbH

** = Incomplete Data Submitted *** = Company Purchased

Issued 20 June 2007 - 2 – Copyright © International Association of Drilling Contractors