Shell Petroleum Development Company Nig. Ltd
Shell Nigeria Exploration and Production Company (SNEPCO)
Exxon Mobil and subsidiaries: Mobil Producing Nig. Unltd & Esso Exploration Nig.Ltd.
TOTAL E & P Nigeria Limited
Agip Energy and Natural Resources
ADDAX Petroleum Development Company Ltd.
Midwestern Oil & Gas Company Ltd.
Sterling Oil Exploration and Energy Production Company Ltd.
SEPLAT Petroleum Development Company Nigeria Limited.
Nigerian Petroleum Development Company- NPDC
British Gas Exploration and Production Nig. Ltd
TOTAL UPSTREAM Nigeria Limited