Title: Experimental Study of CO2-EOR and N2-EOR with Focus on Relative Permeability Effect
Abstract: Accurate performance prediction for miscible EOR projects or CO 2 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 CarbonDioxide (CO 2 ) injection is compared with Nitrogen (N2) injection.Oil relative permeability in CO 2 injection found to be higher than in N2injection, but Gas relative permeability in CO 2 injection found to be lower than in N2injection.Higher oil relative permeability in CO 2 injection causes higher recovery factor, lower differential pressure across the core and different trend of differential pressure during CO 2 injection.Also results were shown that enhancement of oil relative permeability by CO 2 is increasing with decreasing oil saturation.Figure 7: Differential pressurecomparison in CO 2 injection and N2 injection after 4 pore volume injection (A) core C3 (B) core C1 (C) core S1.