Surfactant polymer (SP) flooding has become an important enhanced oil recovery (EOR) technique for the high-water cut mature oilfield. Emulsification in the SP flooding process is regarded as a powerful mark for the successful application of SP flooding in the filed scale. People believe emulsification plays a positive role in EOR. This paper uses one-dimensional homogenous core flooding experiments and parallel core flooding experiments to examine the effect of emulsification on the oil recoveries in the SP flooding process. 0.3 pore volume (PV) of emulsions which are prepared using ultralow interface intension (IFT) SP solution and crude oil with stirring method was injected into core models to mimic the emulsification process in SP flooding, followed by 0.35 PV of SP flooding to flood emulsions and remaining oil. The other experiment was preformed 0.65 PV of SP flooding as a contrast. We found SP flooding can obviously enhance oil recovery factor by 25% after water flooding in both homogeneous and heterogeneous cores. Compared to SP flooding, emulsification can contribute an additional recovery factor of 3.8% in parallel core flooding experiments. But there is no difference on recoveries in homogenous core flooding experiments. It indicates that the role of emulsification during SP flooding will be more significant for oil recoveries in a heterogeneous reservoir rather than a homogeneous reservoir.

中文翻译：

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乳化剂对均相和非均相多孔介质中表面活性剂/聚合物驱油过程中提高采收率的影响

表面活性剂聚合物（SP）驱油已成为高含水成熟油田的重要的提高采收率（EOR）技术。SP驱油过程中的乳化被认为是成功应用SP驱油技术的有力标志。人们认为，乳化在EOR中起着积极作用。本文利用一维均质岩心驱油实验和平行岩心驱油实验研究了乳化对SP驱油过程中油采收率的影响。使用超低界面强度（IFT）SP溶液和原油通过搅拌方法制备的乳液的0.3孔体积（PV）注入到核心模型中，以模拟SP驱替中的乳化过程，然后以0.35 PV的SP驱替以驱替乳液和剩余的油。另一个实验是采用SP泛滥的0.65 PV作为对比。我们发现，均质和非均质岩心注水后，SP驱能明显提高采收率25％。与SP驱油相比，乳化可以在平行岩心驱油实验中贡献3.8％的额外回收率。但均质岩心驱油实验的采收率没有差异。这表明，在SP驱油过程中，乳化作用对于非均质油藏而不是均质油藏的采油更为重要。乳化可以在平行岩心驱油实验中贡献3.8％的额外回收率。但均质岩心驱油实验的采收率没有差异。这表明，在SP驱油过程中，乳化作用对于非均质油藏而不是均质油藏的采油更为重要。乳化可以在平行岩心驱油实验中贡献3.8％的额外回收率。但均质岩心驱油实验的采收率没有差异。这表明，在SP驱油过程中，乳化作用对于非均质油藏而不是均质油藏的采油更为重要。