Perpustakaan Digital ITB

The Organization of the Petroleum Exporting Countries (OPEC) predicts that the global oil demand and consumption will rise to 116 million barrels per day by 2045. It is also in line with Indonesia’s target to increase the national production by 1 million BOPD of oil and 12 billion SCFD of natural gas in 2030. To meet the growing demand for energy, the petroleum industry will be pushed to develop new techniques and improve current ones that can increase the oil production rates from both conventional and unconventional reserves. CO2 foam injection is recognized as a promising approach to increase oil production rates. The idea of injecting CO2 foam was proposed to deal with the problems of early gas breakthrough and poor sweep efficiency occurred in the process of pure CO2 injection. In the CO2 foam injection process, the presence of foam lamella reduces the gas mobility so that the oil recovery process can significantly improve the displacement efficiency. The foam can stabilize the oil displacement process by increasing the effective viscosity of the gas. This study performs a simulation study by using CMG STARS for a reservoir model with a direct line drive pattern to evaluate several development strategies for CO2 foam co-injection with foam properties sensitivity. After performing reservoir simulations for 15 years injection to identify the effect of CO2 foam co-injection compared to pure CO2 injection and watersurfactant injection, then doing sensitivity to identify the effect of foam properties with varying foam quality and Mobility Reduction Factor, this simulation study reveals the following findings. First, adding foam into the CO2 EOR process can reduce the mobility of CO2 so the gravity override does not occur and slow down the gas breakthrough occurrence. Then, it leads to the increase of displacement efficiency and cumulative oil production. The CO2 foam co-injection also can reduce the water cut compared with the water-surfactant injection. Second, increasing the foam quality can decrease the displacement efficiency and cumulative oil production but in the other side slow down the gas breakthrough and reduce the water cut. Meanwhile, increasing the MRF can increase the displacement efficiency and cumulative oil production as well as slow down the gas breakthrough. As a result, the application of CO2 foam co-injection offers significant benefit and represents an innovative technique with promising potential for enhancing oil recovery.