Clients

Following is a partial list of clients showing IRT's strong domestic and international presence in the field.

AEC Oil & Gas (USA) Inc. Anadarko Petroleum Corporation ARCO China, Inc. Binger Operations British Petroleum Burlington Resources - London Cabot Oil and Gas CamWest Exploration, LLC CEPSA (Compaņia Espaņola de Petroleos SA) Columbia Gas Consolidated Oil and Gas Crutcher-Tufts Corp. Duncan Oil Company ECOPETROL, S.A. (Colombia) EnCana Energy Resources, Inc. Ensign Oil & Gas, Inc.

Evergreen Resources Forest Oil Corporation HS Resources, Inc. Landmark, A Halliburton Company LL&E Algeria LOCS Oil Company of Spain, S.A. MAKOIL Masek Oil Mobil E&P Technical Center Nance Petroleum Nielson & Associates, Inc. Ocean Energy, Inc. Panterra Petroleum PEMEX / Western Atlas Petrocolumbia (Columbia) PDVSA, S.A. (Venezuela) - formerly MARAVEN Phillips Petroleum Pluspetrol S.A. Prudence Petroleum Development Company, Ltd - Nigeria Questar Energy Resource Services International Santos, Ltd. Sonatrach - Organisation Ourhoud (OO/SH) St. Mary Land and Exploration UMC Petroleum Corporation Whiting Petroleum

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