Simulation of gas injection strategies demonstrates that CO2 offers superior miscibility and economic feasibility in high-salinity reservoirs.
This study presents a comprehensive evaluation of miscible gas injection (MGI) strategies for enhanced oil recovery (EOR) in high-salinity reservoirs, with a focus on the Raleigh Oil Field. Using a calibrated Equation of State (EOS) model in CMG WinProp™, eight gas injection scenarios were simulated to assess phase behavior, miscibility, and swelling factors. The results indicate that carbon dioxide (CO2) and enriched separator gas offer the most technically and economically viable options, with CO2 demonstrating superior swelling performance and lower miscibility pressure requirements. The findings underscore the potential of CO2-EOR as a sustainable and effective recovery method in pressure-depleted, high-salinity environments.
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Metwally et al. (2025) studied this question.