Analisis Sensitivitas Injeksi Co2 Foam Sebagai Upaya Peningkatan Oil Recovery Factor

The gas injection method was first discovered in 1930 with high effectiveness. In its application, CO2 injection has been carried out in several methods, namely miscible CO2 injection and immiscible CO2 injection. CO2 flooding has the advantage of being an effective Enhanced Oil Recovery (EOR) method by reducing the amount of oil remaining in the reservoir through several mechanisms such as: oil swelling, viscosity reduction, and miscible displacement. The weakness in the hydrocarbon sweeping process can cause the phenomenon of gravity segregation, viscous fingering, and channeling. To control the problem of the mobility ratio of the gas which is less favorable, CO2 injection is added with other recovery techniques, one of which is using foam. Foam has the potential to increase the sweep efficiency of the injected gas. The foam is enveloped by a continuous liquid phase which forms a thin layer called lamellae. Lamellae are formed by surfactants which function as foaming agents. In this study, a sensitivity analysis of CO2 foam injection will be carried out to increase the oil recovery factor by testing the sensitivity of CO2 foam to variations in surfactant concentration and injection flow rate. In this study, the reservoir model was conceptualized using secondary data from the paper. The model is simulated using the CMG STARS. By injecting CO2 foam, the EOR process can significantly improve sweep efficiency due to reduced gas mobility in the presence of a foam layer. The most optimal CO2 foam injection is in scenario 4 case 3 with a CO2 gas injection flow rate of 10.5 mmscf/day using a surfactant concentration of 0.4%wt. Get a recovery factor of 18.04% and cumulative oil of 2.791 MMSTB, because it has the highest recovery results and uses less surfactant