To investigate the interactions between CO2 and CH4 in aqueous phase and their competitive dissolution effects on CO2-enhanced oil recovery processes,a numerical simulation model incorporating the competitive disso-lution of CO2 and CH4 was developed.The established model modifies the solubility of CH4 at different CO2 concen-trations and improves the equilibrium constants that characterize methane solubility.Simulation results indicate sig-nificant changes in the distribution of gas components due to competitive dissolution,affecting the gas-oil ratio and water cut fluctuations,thereby impacting the production performances of the reservoir.Under competitive dissolu-tion,the CH4 content in the gas phase increases,further confirming the complexity of interactions between CH4 and CO2.This model accurately reflects gas interactions during the CO2 flooding process.
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