Perpustakaan Digital ITB

The rising concentration of atmospheric CO2, mainly from emissions, contributes to global warming and environmental degradation. CO2-enhanced oil recovery (CO2-EOR) is a viable strategy to reduce carbon levels while meeting energy needs. Studies show that CO2 injection can significantly enhance oil recovery. This study focuses on sensitivity analysis of several injection parameters in continuous CO2 flooding on oil recovery factors in a various dip angle of the reservoir. Compositional reservoir simulations were conducted using CMG GEM software. Simulations were performed for four different dip angles of the reservoir, varying seven CO2 injection rates, six injection pressures, and three injection depths. Simulation results show a positive relationship between all three injection parameters and oil recovery factor. Sensitivity analysis shows that injection depth has a positive relationship with the recovery factor for all reservoirs with different dip angles. Sensitivity analysis indicated that larger dip angles (down-dip to the production well) improve CO2-EOR performance, with relevancy factors ranging from 0.98 to 0.90 for injection rates of 1-10 MMSCFD and 0.99 to 0.37 for pressures of 1100-1300 psi. However, when injection rates or pressures are high and near the minimum miscibility pressure (MMP), relevancy factor drops significantly, reaching -0.81 for a 15 MMSCFD rate and from -0.71 to -0.99 for pressures of 1400-1700 psi. Below MMP, dip angles benefit CO2 injection, but this advantage diminishes as pressure approaches MMP.