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Petroleum Science >2013, Issue 1: 91-96 DOI: https://doi.org/10.1007/s12182-013-0254-9

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

文章信息

作者：Dong Zhaoxia,Li Yi,Lin Meiqin and Li Mingyuan

作者单位：

Enhanced Oil Recovery Research Institute, China University of Petroleum, Beijing 102249, China; Beijing Key Laboratory for Greenhouse Gas Storage and Enhanced Oil Recovery, Beijing 102249, China; Key Laboratory of Enhanced Oil Recovery, CNPC, Beijing, 10;Enhanced Oil Recovery Research Institute, China University of Petroleum, Beijing 102249, China; Beijing Key Laboratory for Greenhouse Gas Storage and Enhanced Oil Recovery, Beijing 102249, China;;Enhanced Oil Recovery Research Institute, China University of Petroleum, Beijing 102249, China; Beijing Key Laboratory for Greenhouse Gas Storage and Enhanced Oil Recovery, Beijing 102249, China; Key Laboratory of Enhanced Oil Recovery, CNPC, Beijing, 10;Enhanced Oil Recovery Research Institute, China University of Petroleum, Beijing 102249, China; Beijing Key Laboratory for Greenhouse Gas Storage and Enhanced Oil Recovery, Beijing 102249, China; Key Laboratory of Enhanced Oil Recovery, CNPC, Beijing, 10

投稿时间：2012-09-16

引用方式：Dong, Z., Li, Y., Lin, M. et al. Pet. Sci. (2013) 10: 91. https://doi.org/10.1007/s12182-013-0254-9

文章摘要

Supercritical carbon dioxide (scCO₂) microemulsion was formed by supercritical CO₂, H₂O, sodium bis(2-ethylhexyl) sulfosuccinate (AOT, surfactant) and C₂H₅OH (co-surfactant) under pressures higher than 8 MPa at 45 oC. The fundamental characteristics of the scCO₂ 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 scCO₂ microemulsion for enhancing oil recovery is discussed. The results showed that the viscosity and density of the scCO₂ microemulsion were higher than those of the scCO₂ fluid at the same pressure and temperature. The results of interfacial tension and slim tube tests indicated that the MMP of the scCO2 microemulsion and crude oil was lower than that of the scCO₂ and crude oil at 45 oC. It is the combined action of viscosity, density and MMP which made the oil recovery efficiency of the scCO₂ microemulsion higher than that of the scCO₂ fluid.

关键词

Supercritical carbon dioxide, microemulsion, MMP, enhancing oil recovery