• PT. Apexindo Pratama Duta
• PT  Arthindho Utama
• PT. Asia Petrocom Services
• PT. Asrindo Citraseni Satria
• PT. Besmindo
• PT. BOB Bumi Siak Pusako – Pertamina EP
• PT. Bormindo Nusantara
• Chevron Indonesia
• Cnooc SES Ltd.
• PT. Elnusa
• PT. Exspan Petrogas Intranusa
• Genting Oil
• PT. Halliburton
• PT. Huabei Petroleum Services
• PT. IEV Pabuaran KSO
• PT. Mandala Energy Lemang, Pte, Ltd.
• PT. Medco Energy
• Pertamina EP
• PT. Pertamina Drilling Services
• PetroChina
• PT. Radiant Utama Interinsco
• PT. Sokoria Geothermal Indonesia
• PT. Sorik Marapi Geothermal Power
• Start Energy Geothermal (Wayang Windu) Ltd.
• Tesco Indonesia
• Weatherford – Wira Insani
• And many more