Subsidiary of Medco Energi Internasional, Tbk. for oil and gas activities in Indonesia, focusing on upstream activity, exploration, development and production of crude oil and natural gas.MedcoEnergi's upstream activities began with its 1992 acquisition of Tesoro's Oil and Gas E&P contracts (Sanga-Sanga/Samboja/Tarakan Blocks TAC and Tarakan Block PSC) in East Kalimantan, MedcoEnergi proceeded to successfully demonstrated its capability in redeveloping and improving the production of mature fields in East Kalimantan. The success in enhancing the performance of mature fields in East Kalimantan, on top of the successful stocks IPO in early fourth quarter 1994, strengthened MedcoEnergi's confident to expand its upstream activities. In 1995 the Company acquired PT Stanvac Indonesia from Exxon and Mobil Oil. The Company acquired Oil and Gas E&P contracts (PSCs) in South Sumatra through this transaction