The effect of CO2/CH4 solvent and N2/CH4 solvent injection on condensate phase behavior in gas condensate reservoir

Abstract

This work is aimed to investigate the effect of CO2/CH4 solvent and N2/CH4 solvent injection on phase behaviors of condensate in DZT reservoir. The results indicate that CO2/CH4 flooding is vaporizing-gas drive when the mole fraction of CO2 is below 0.8, and it becomes condensing-gas drive with the mole fraction of CO2 greater than 0.8. To lower the minimum miscible pressure of multiple contact miscibility (MCM), the mole fraction of CO2 in CO2/CH4 solvent must be larger than 0.6. The N2 content in N2/CH4 solvent has no effect on minimum pressure of MCM.