Effect of CO2 Corrosion and Adsorption-Induced Strain on Permeability of Oil Shale: Numerical Simulation

Permeability is a crucial parameter for enhancing shale oil recovery through CO2 injection in oil-bearing shale. After injected into the reservoir, corrosion and adsorption-induced strain can change permeability of shale, affecting oil. This study aimed to explore influence on The deformation internal pore diameter induced by under different pressures was measured low-pressure nitrogen gas adsorption laboratory, model fitted using experimental data. Following basic definitions porosity, dynamic mathematical porosity obtained, fluid–solid coupling CO2-containing established according theory coupling. Then effects expansion compression evolution were considered improve accuracy model. numerical simulation results showed that strain, confining pressure are important factors controlling In addition, have fluid pressures. zone, decreases with increasing pressure. high-pressure increase while gradually recovers. compressive increases slowly permeability. However, area, weakens