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Enhanced residual oil recovery by using polymer/betaine surfactant system after water flooding
XIA Hui-fen1,WANG Hai-feng1,WANG Gang1,2,HU Jin-qiang1,LIU Chun-de3
(1.Key Laboratory of Enhancing Oil and Gas Recovery of Education Ministry in Daqing Petroleum Institute,Daqing 163318,Heilongjiang Province, China ;2.Department of Science and Technology Development in Daqing Oilfield Corporation Limited,Daqing 163453, Heilongjiang Province, China;3. Exploration and Development Research Institute, PetroChina, Beijing 100083,Chirm)
Abstract:
Using a polymer/betaine surfactant compound system for short surfactant/polymer (SP) compound system that can attain ultra-low interfacial tension with oil at conditions of no-aJkali, the effect of betaine surfactant on the rheology of SP compound system was analyzed through rheology experiment. Through oil-displacement experiments by micro-visualization models and artificial cores, the influence of visco-elasticity and interfacial tension of SP compound system on recovery efficiency was analyzed,and the action mechanism of the SP compound system on residual oil after water flooding was studied. The results show that the ultra-low interfacial tension between amphoteric betaine surfactant and oil can be formed, and the influence of betain surfactant on visco-elasticity of the SP compound system is slight. Both the mobility control characteristic of polymer and the ultra-low interfacial tension characteristic of the surfactant can be utilized fully in polymer/amphoteric surfactant flooding. Hie core flooding experiments indicate that the oil recovery after polymer/surfactant systems flooding is better than that of single surfactant flooding and is also better than that of single polymer flooding,and the visco-elasticity of the SP compound system is larger, oil recovery is higher. When the interfacial tension decreases from 10'2 mN/m to 103 mNm,、the ultimate recovery of SP compound solution at 10 "3 mN/m is higher than that of the increase in mass concentration or relative molecule mass of SP compound system at 10 2 mN/m.
Key words:  polymer  surfactant  binary compound system  oil displacement mechanism  residual oil  enhanced oil recovery