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- Title
表面活性剂对水驱普通稠油油藏的乳化驱油机理.
- Authors
孙宝泉; 吴光焕; 赵红雨; 吴 伟; 孙 超
- Abstract
Alkylphenolpolyethoxylate (J1), α-alkenyl sulfonate surfactant (J2), dodecyl hydroxysulfobetaine (J3) and combinational surfactants (J4) were selected as oil displacing agents, in order to study the oil displacement efficiency and pore scale enhancement mechanism of emulsification viscosity reducing oil displacing agents in water flooding for common heavy oil reservoirs with different permeability. The simulation experiments of one-dimensional displacement and micro-displacement of 4 kinds of displacement agents were carried out. The mechanism of emulsifying viscosive-reducing oil displacement agent at pore scale was clarified. The results showed that reducing interfacial tension had more effect on improving oil displacement efficiency than increasing emulsification viscosity reduction. Emulsified viscosity reducing oil displacement agents relied on the synergistic effect of emulsified viscosity reducing and interfacial tension reduction, in order to significantly improve oil displacement efficiency in reservoir. The stronger the emulsification ability and lower the interfacial tension between oil and water of emulsified viscosity reducing oil displacement agents, the greater the increase in oil displacement efficiency was. When the viscosity reduction rate of chemical emulsification reached 95%, the interfacial tension between oil and water decreased by one order of magnitude from 10-1 mN/m, the oil displacement efficiency of chemical agents in high permeability and low permeability cores increased about 10.0% and 7.8% respectively. At the initial stage of oil displacement agent injection, the displacement pressure of high permeability and low permeability core was 1/2 and 1/3 of the water flooding pressure by reducing the interfacial tension respectively, so as to improve the injection capacity. At the later stage of injection, large blocks of crude oil were emulsified to form a large number of oil droplets with different sizes, which enhanced the fluidity of crude oil and improved the efficiency of oil displacement. The viscous oil droplets formed by emulsification with relatively stable interface could temporarily block the throat of rock and the channel formed by large heavy oil and rock particles. Through the temporary plugging superposition effect, the displacement pressure in high permeability and low permeability core was 5.2 times and 32.3 times as high as that of water flooding respectively, so the injection pressure was greatly increased and then the plane sweep area was expanded. Viscosity reducing oil displacing agent could improve oil displacement efficiency and expand the sweep range at the same time. The research results pointed out the direction of research and development of water flooding agent for heavy oil, and laid a foundation for greatly improving the recovery of water flooding for common heavy oil.
- Publication
Oilfield Chemistry, 2024, Vol 41, Issue 1, p138
- ISSN
1000-4092
- Publication type
Article
- DOI
10.19346/j.cnki.1000-4092.2024.01.019