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Abstrait
Experimental Study of CO2-EOR and N2-EOR with Focus on Relative Permeability Effect
E. Ghoodjani and S.H. Bolouri
Accurate performance prediction for miscible EOR projects or CO2 sequestration in depleted oil and gas reservoirs relies in precise characterization of reservoir rock and fluid. 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 found to be higher than in N2injection, but Gas relative permeability in CO2 injection found to be lower than in N2injection. 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.