 Shell Petroleum Development Company (SPDC)
 Mobil Producing Nigeria Unlimited (MPN)
 Chevron Nigeria Limited.
 Delta Afrik Nigeria Limited
 Nigerian National Petroleum Corporation (NNPC)
 Power Holdings Company of Nigeria (PHCN)
 Eleme Petrochemicals Port Harcourt
 Briton Services Warri
 Ozono Nig Ltd
 Petroleum Training Institute Effurun, Delta State
 Ashialin Nig Ltd
 Amsek Nig Ltd
 Sapper Nigerian Army(NNPC Project)
 Gramen Petroserve Nig, Ltd