Effects of secondary emulsification of field ASP flooding produced fluid by centrifugal pumps and electrostatic field on its oil/water separation performances were evaluated. Secondary emulsification of certain ASP flooding produced fluid with high surfactant content by centrifugal pumps drastically downgraded its oil/water separation performances, increasing the residual water-cuts after 24h static settling at 60°C respectively by 70% for original o/w emulsion and 1080% for w/o emulsion. Certain w/o emulsion produced by ASP flooding with high surfactant content was susceptible to secondary emulsification in high strength electrostatic field with up to 660% increase of residual water-cut after 24h static settling at 60°C. Mechanisms governing the effects of secondary emulsification on the oil/water separation performances of ASP flooding produced fluid were discussed. In comparison with produced fluid by water flooding and polymer flooding, the oil/water interfacial tension in ASP flooding produced fluid is much lower, making oil droplets in water and water droplets in oil significantly more sensitive to shear and high strength electrostatic field. Energy dissipation rate, surfactant content and the volume ratio of dispersed phase in the emulsion were identified to be the most important factors affecting the secondary emulsification of ASP flooding produced fluid in turbulent flow. Water in oil emulsion extracted from high water-cut o/w or w/o/w ASP flooding produced fluid was found to have significantly higher water phase surfactant content than the original crude oil emulsion and is much more susceptible to secondary emulsification in turbulent flow than the original reverse emulsion. Surfactant content, content of dual wettability micron and submicron sized particles and the strength of electrostatic field were found to be major factors affecting the secondary emulsification of ASP flooding produced w/o emulsion in AC electrostatic field. As interfacial tension between oil and water in w/o emulsion produced by ASP flooding can be 1 to 2 orders lower than that in the w/o emulsion produced by water flooding and polymer flooding, strength of electrostatic field in electrostatic treaters has to be optimized as per the surfactant content in the ASP flooding produced w/o crude oil emulsion they treat.

评估了现场离心泵对油田驱油液和静电场的二次乳化对其油水分离性能的影响。通过离心泵对某些ASP驱油进行的二次乳化生产出的表面活性剂含量高的流体大大降低了其油水分离性能，在60°C静置24小时后，原始o / w乳液和1080的静水沉降后残余含水率分别增加了70％。 w / o乳液的％。由高表面活性剂含量的ASP驱油生产的某些w / o乳液在高强度静电场中易于二次乳化，在60°C静置24h后，残留含水量最多增加660％。讨论了控制二次乳化对ASP驱采液油水分离性能影响的机理。与通过水驱和聚合物驱产生的流体相比，ASP驱产生流体中的油/水界面张力要低得多，这使得水中的油滴和油中的水滴对剪切力和高强度静电场更加敏感。能量耗散率，表面活性剂含量和乳液中分散相的体积比被认为是影响湍流中ASP驱采液二次乳化的最重要因素。从高含水度o / w或w / o / w ASP驱采油中提取的油包水乳状液比原始原油乳状液具有明显更高的水相表面活性剂含量，并且更容易在湍流中二次乳化比原来的反向乳液。发现表面活性剂含量，双重润湿性微米和亚微米级颗粒的含量以及静电场的强度是影响在交流静电场中不带乳液的ASP驱油的二次乳化的主要因素。由于ASP驱油后W / O乳液中油和水之间的界面张力比水驱和聚合物驱水后W / O乳液中的油和水界面张力低1至2个数量级，