Abstract
Gas injection is the second largest enhanced oil recovery process being applied in many reservoirs around the world. Simulation of these processes is necessary for implementation, management, and decision making. Relative permeability is one of the most important factors in numerical reservoir simulation. In this study, several core flood experiments are done and the relative permeability in carbon dioxide (CO2) injection is compared with nitrogen (N2) injection. Oil relative permeability in CO2 injection is found to be higher than in N2 injection, but gas relative permeability in CO2 injection is found to be lower than in N2 injection. Higher oil relative permeability in CO2 injection causes higher recovery factor, lower differential pressure across the core, and different trend of differential pressure during CO2 injection. Also, results were shown that enhancement of oil relative permeability by CO2 is increasing with decreasing oil saturation.
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