Interphase Mass Transfer in the Petroleum System During CCUS-EOR Process
CO₂ flooding is a technique that utilizes CO₂ to enhance oil recovery(CCUS-EOR),and an effective means to reduce carbon emis-sions.To understand the interphase mass transfer in the petroleum system during CCUS-EOR,CO₂/dry gas contact experiments were con-ducted to elucidate the changes in components of the petroleum system during the initial contact conditions at different pressures.The re-sults indicate that during the initial contact between CO₂ and oil,the interphase mass transfer for volatile and non-volatile components oc-curs through evaporative extraction,while the interphase mass transfer for intermediate components occurs through dissolution diffusion,which is stronger than evaporative extraction.As pressure increases,the volatile components show enhanced evaporative extraction,the non-volatile components reflect diminished evaporative extraction,and the intermediate components exhibit augmented dissolution diffusion.At relatively low pressure in the initial stage of gas injection,the interphase mass transfer of the petroleum system is dominated by evapora-tive extraction.As pressure increases,the mechanism of interphase mass transfer for volatile components shifts to dissolution diffusion.Dur-ing the initial contact process between dry gas and oil,the interphase mass transfer for intermediate and non-volatile components is domi-nantly evaporative extraction.CO₂ is more capable of evaporative extraction than dry gas.
CCUS-EORinitial contactevaporative gas floodingcondensate gas floodingevaporative extractiondissolution diffusion
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