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《Journal of Chongqing University》 2011-04
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Characteristics of immiscible CO_2 displacement in extremely low permeability reservoir

SU Yu-liang 1,2,WU Chun-xin2,ZHANG Qi2,WU Xiao-dong1(1.School of Petroleum Engingeering,China University of Petroleum,Beijing 102249,P.R.China; 2.School of Petroleum Engingeering,China University of Petroleum,Dongying 257061,Shandong,P.R.China)  
The research of characteristics of CO2 flooding in extremely low-permeability reservoirs are of great significance.A linear dimension immiscible CO2 displacement mathematics model considering threshold pressure gradient and characteristics of CO2 which describes extremely low permeability reservoir is established.After numerical resolution,analyze the influence of threshold pressure gradient and characteristics of CO2 on the displacement characteristics of extremely low permeability reservoir.The results show that: the existence of threshold pressure gradient make average gas saturation and gas rate increase rapidly,and then the efficiency of displacement is reduced;during CO2 flooding,the expansion and viscosity reduction of crude oil make effect displacement better.The research has theory direction for the reasonable development of low permeability reservoir.
【Fund】: 国家“973”资助项目(2006CB705804);; 泰山学者建设工程专项经费资助项目(TS20070704)
【CateGory Index】: TE345
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