Publications

CO2 is one of the premier greenhouse gases because of the large amount in the atmosphere. It causes earth’s surface temperature to increase every year. There is about a global movement to reduce CO2 emissions to atmosphere as one of the factors that causes global warming. It is an urgent issue today for the petroleum industry because CO2 is one of the byproducts by its success. But this dangerous byproduct can be utilized as green oil recovery to enhance oil production. CO2 injection has already been proven to decrease oil viscosity, interfacial tension, and residual oil saturation where other methods cannot achieve the same results. This paper investigates CO2 injection to determine the best method in terms of increased recovery factor and CO2 storage in reservoir for each injection sequence in laboratory environment. Several injection scenarios including WAG (Water Alternating Gas) injection are employed to increase the efficiency of oil sweep area. Mathematical modeling is used in the investigation. This research used brine water saturated 2 inch diameter synthetic cores and oil sample from one field in Indonesia. Temperature was set at reservoir condition and CO2 injection occurred under minimum miscible pressure (MMP). WAG yields better recovery factor and CO2 storage in reservoir condition than continuous CO2 injection under these laboratory conditions. Various WAG sequences do not make a significant difference to total recovery factor and CO2 volume storage as long as pore volume injection pressure is constant.