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《Journal of China University of Petroleum(Edition of Natural Science)》 2010-05
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Fluid parameter modification and affecting factors during immiscible drive with CO_2

LI Dong-xia1,SU Yu-liang2,GAO Hai-tao3,GENG Yan-hong2 ( 1. College of Physics Science and Technology in China University of Petroleum,Dongying 257061,China; 2. College of Petroleum Engineering in China University of Petroleum,Dongying 257061,China; 3. Chunliang Oil Production Plant,Shengli Oilfield,Binzhou 256504,China)  
Considering the characteristic of CO2 drive and capillary force,a mathematical model of one-dimensional immiscible CO2 drive was built and the numerical solution was obtained. Meanwhile,the reliability of the mathematical model was verified by matching with experimental data. The results show that the simulation results of testing points agree well with the experimental data,and the maximum error is 1. 322% ,and the reilability of model was verified. The higher the viscosity of crude oil,the more obvious the effect of viscosity reduction by CO2,but the degree of reserve recovery at the same total injection volume becomes low with the increasing velocity of CO2 breakthrough. CO2 solubility in crude oil decreases with the drop of formation pressure. The gas saturation at the front reduces under the impact of capillary force,which prolongs the production cycle.
【Fund】: 国家“973”重点基础研究发展规划项目(2006CB705804);; 国家科技重大专项(2008ZX05030-005-02);; “泰山学者”建设工程专项(ts20070704)
【CateGory Index】: TE357.4
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