Abstract
Determination of the diffusion coefficient of a miscible Supercritical CO2 (ScCO2) and oil system is substantial for guiding the CO2 EOR and greenhouse gas geological storage practices. Based on the oil droplet interface shrinkage behavoir after reaching miscibility with the surrounding CO2, the diffusion coefficients of a miscible ScCO2/paraffin system were measured with the Dynamic Pendant Drop Volume Analysis (DPDVA) technique. A refined diffusion coefficient derivation model was proposed and validated for the CO2/oil system at the Minimum Miscibility Pressure (MMP) points. The measurements were performed under pressure range of 9–21 MPa and temperature range of 40.6–81.2 ℃. Exponential relationships have been obtaind between the diffusion coefficient and the pressure and the intrinsic oil viscosity, revealing the fact that the diffusion rate increases significantly with the system pressure after reaching miscibility. On the other hand, it is found higher temperature could retard the diffusion process between the ScCO2 and the oil phases under miscible conditions.
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