A study of the mechanism of enhancing oil recovery using supercritical carbon dioxide microemulsions

被引：0
作者：
Dong Zhaoxia [1 ,2 ,3 ]
Li Yi [1 ,2 ]
Lin Meiqin [1 ,2 ,3 ]
Li Mingyuan [1 ,2 ,3 ]
机构：
[1] Enhanced Oil Recovery Research Institute,China University of Petroleum
[2] Beijing Key Laboratory for Greenhouse Gas Storage and Enhanced Oil Recovery
来源：
Petroleum Science | 2013年 / 01期
关键词：
Supercritical carbon dioxide; microemulsion; MMP; enhancing oil recovery;
D O I：
暂无
中图分类号：
TE357.45 [];
学科分类号：
082002 ;
摘要：
Supercritical carbon dioxide (scCO 2) microemulsion was formed by supercritical CO 2 , H 2 O, sodium bis(2-ethylhexyl) sulfosuccinate (AOT, surfactant) and C 2 H 5 OH (co-surfactant) under pressures higher than 8 MPa at 45 oC. The fundamental characteristics of the scCO 2 microemulsion and the minimum miscibility pressure (MMP) with Daqing oil were investigated with a high-pressure falling sphere viscometer, a high-pressure interfacial tension meter, a PVT cell and a slim tube test. The mechanism of the scCO 2 microemulsion for enhancing oil recovery is discussed. The results showed that the viscosity and density of the scCO 2 microemulsion were higher than those of the scCO 2 fluid at the same pressure and temperature. The results of interfacial tension and slim tube tests indicated that the MMP of the scCO 2 microemulsion and crude oil was lower than that of the scCO 2 and crude oil at 45 oC. It is the combined action of viscosity, density and MMP which made the oil recovery efficiency of the scCO 2 microemulsion higher than that of the scCO 2 fluid.
引用
收藏
页码：91 / 96
页数：6
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