Aabar
ADMA-OPCO
AfricOil
Al Safwah Oilfields Supply & Services LLC
Anglo Irish Bank
Anglo Siberian Oil Company
Apache
Arthur D Little
Asher Energy Corporation
Cairn Oil and Gas
Cambay Petroleum Operating Company LLC
CentraGas Holdings
Circle Oil plc
Dallas Associates
Directorate General of Hydrocarbons
Divine Inspiration Group Holdings
DSV Pipetronix
Efora Energy Limited
Eleda Capital
Energy Venture Partners
European Hydrocarbons
Frigate Exploration Limited
GASOP
Gazprom Neft
Government of Guyana
INA
INPEX Corporation
Instituto Nacional de Petroleo
Interconsulting
INTSOK
Jindal Petroleum Operating Company LLC
JOGMEC
JSC NC KazMunayGas
KBC Bank
La Generale Petroliere du Congo SPRL
LOTOS Petrobaltic S A
Ministry of Energy (Ukraine)
Ministry of Natural Resources - Guyana
Mubadala
NewAGE Africa Global Energy
Oil and Gas Development Company Limited
Oil and Natural Gas Corporation
Oil India Limited
ONGC Videsh
Orlen Upstream Sp. z o.o.
Pacific Oil Limited
Parsons Brinckerhoff
PEMEX Exploracion y Produccion
PetroKazakhstan
PJSC Rosneft Oil Company
Polygon Investments
RAKGas LLC
Regal Petroleum
Sahara India Pariwar
Samroc
Sea Dragon Energy Incorporated
Sefton Resources Incorporated
Setanta Energy
SNC Lavalin International
SOCAR
Staatsolie
Sterling Grace
Sun Energy Resources
Turkiye Petrolleri Anonim Ortaklığı
Unistar Petroleum Corporation
Varun Industries
Vedanta
Vega Petroleum Limited
West African Ventures
Winfield Resources
Wintershall Holding GmbH
Wood plc
