Publications

The world’s conventional oil reserves are declining. Meanwhile, energy demand is increasing day by day. New methods and approaches are necessary to satisfy increasing demand for energy. CWI (Carbonated Water Injection) is a good method to optimize recovery by injecting water that has been saturated with CO2 gasses to the reservoir. Worldwide, CO2 injection is a mature technology used to improve oil production. Compared to other CO2 injection methods CWI method can minimize the suppression, storage, and transportation costs in the operational system. The carbonated water will form carbonate acid water which reacts with surrounding lithology. The method is eco-friendly because CO2 gasses which are injected are derived from industrial gas emissions. Through the gas distribution mechanism, from the industrial pipeline, the gas is saved in a storage tank. Next, the gas is saturated with water and streamed to the injection well and reservoir. Central Sumatra Basin is a basin that benefits from Enhanced Oil Recovery (EOR) methods to produce oil. Oil production in this basin has decreased from 750 thousand barrel/day in 1952 to present day levels of 250 thousand barrel/day. South Sumatra Basin and Central Sumatra Basin are the largest targets for EOR in Indonesia with a Lemigas study indicating approximately 58% EOR target in those areas. In South Sumatra Basin, 64 from 136 reservoirs are candidates for CO2 injection (Edward, et al, 2004). CWI injection can be performed in Menggala and Bekasap Formations as the main reservoirs. By this method, it is expected to minimize the cost of CO2 gas injection and increase recovery in the Central Sumatra Basin.