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Impact of pore-pressure on the recovery efficiency from CO2-methane displacement experiments

The intricate behavior of carbon dioxide at super critical conditions is considered to influence the ultimate recovery of additional hydrocarbon reserves through the application of CO2-enhanced gas recovery projects. At the more extreme reservoir conditions of pressure of 41.37 MPa and temperature 433.15 K, CO2 exhibits a greater viscosity and density if compared to methane. This variation is approximately a factor of three, which is in favor of the CO2-natural gas displacement. In contrast, at near super critical conditions of pressure of 7.39 MPa and temperature 304.15 K, the CO2 physical property (viscosity and density) is slightly superior to methane's. Therefore excessive mixing is anticipated if CO2 is injected to displace natural gas, particularly at well abandonment pressure. Because mixing in such a system is a diffusion-like process, which definitely depends on the physical properties of the displacing and displaced phases and the heterogeneity of the medium.