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Mechanisms of oil displacement by ASP-foam and its influencing factors

Petroleum Science 2010年第1期7卷 100-105页

作者： Wu Wenxiang Pan Jianhua Guo Mingri Key Laboratory of Enhanced oil and Gas Recovery Ministry of Education Daqing Petroleum Institute DaqingHeilongjiang 163318 China

ASP-foam （aspf） is a system prepared by injecting natural gas into the conventional alkali- surfactant-polymer （ASP） system. Foam can be formed in the porous media by the interaction of gas and surfactant in the ASP system. With the aspf system, oil recovery is improved as the interfacial tension （IFT） is reduced to a relatively low level, and the swept volume is enlarged. In this paper, four surfactants were evaluated and characterized by IFT between ASP system and oil and the foaming performance. AI- kyl benzene sulfonate （ORS-41） was chosen as the surfactant to best reduce IFT between displacement fluids and oil and improve the foaming performance. The mechanisms of aspf flooding were studied in this paper, the results show that the aspf flooding not only enlarges the swept volume but also enhances the displacement efficiency. The effects of reservoir heterogeneity, the gas-liquid ratio of aspf system, and the concentrations of polymer and surfactant on the displacement efficiency were studied. A field trial of aspf flooding has also been conducted. Both the laboratory results and the field trial results show that the aspf flooding can significantly increase the oil recovery, with a 30% increase in the proportion of the original oil in place recovered compared with water flooding.

关键词： oil displacement by aspf system oil displacement mechanism displacement efficiency influencing factor

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