Alkali-surfactant-polymer (ASP) flooding is very promising chemical enhanced oil recovery (EOR) technology which can make an incremental oil recovery factor (IORF) of 30% original oil in place (OOIP). How to choose alkali in ASP flooding remains a question for a long time. As the world’s only and largest ASP flooding application place, Daqing Oilfield has always adhered to the strategy of parallel development of strong alkali ASP flooding (SASP) and weak alkali ASP flooding (WASP), but SASP is in a dominant position, indicated by more investments and more project numbers. This leaves an impression that SASP is better than WASP. However, WASP is drawing more interest than SASP recently. Moreover, as the ASP flooding in Daqing went from field tests to commercial applications since 2014, how to comprehensively consider the benefit and cost of ASP flooding has become a new focus at low oil prices. This paper compares two typical large-scale field tests (B-1-D SASP and B-2-X WASP) completed in Daqing Oilfield and analyzes and discusses the causes of this difference. The injection viscosity and interfacial tension (IFT) for the two field test areas are substantially equivalent under the conditions of Daqing Oilfield, and WASP is better than SASP when reservoir geological conditions are considered. WASP exhibits the same IORF of 30% as SASP while having a much better economic performance. For the SASP field test, the injected strong alkali NaOH makes the test behave unlike a typical strong ASP flooding due to the presence of CO2 in the formation fluid, which well explains why IORF is much higher than all the other SASPs but scaling is less severe than others. This paper confirms that under Daqing Oilfield reservoir conditions, it is the alkali difference that caused the performance difference of these two tests, although some minor uncertainties exist. WASP is better than the SASP providing the same conditions . In addition, the detailed information of the two ASP field tests provided can give reference for the implementation of ASP flooding in other oilfields. After all, the study of ASP flooding enhanced oil recovery technology under low oil prices requires great foresight and determination.

中文翻译：

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碱对碱-表面活性剂-聚合物 (ASP) 驱提高采收率性能的影响：两个大规模现场试验的证据

碱-表面活性剂-聚合物（ASP）驱是一种非常有前景的化学提高采收率（EOR）技术，它可以使原油采收率（IORF）增加30％的原油（OOIP）。三元复合驱中如何选择碱一直是一个问题。作为全球唯一、规模最大的三元复合驱应用场所，大庆油田一直坚持强碱三元复合驱（SASP）与弱碱三元复合驱（WASP）并行开发的战略，但SASP处于优势地位，更多投资和更多的项目数量。这给人的印象是 SASP 比 WASP 好。然而，最近 WASP 比 SASP 更受关注。此外，随着大庆三元复合驱自2014年开始从现场试验走向商业应用，如何综合考虑三元复合驱的收益和成本，成为低油价下的新焦点。本文对比了在大庆油田完成的两个典型的大型现场试验（B-1-D SASP和B-2-X WASP），并分析和讨论了这种差异的原因。两个现场试验区的注入粘度和界面张力（IFT）在大庆油田条件下基本相当，考虑到油藏地质条件，WASP优于SASP。WASP 表现出与 SASP 相同的 30% 的 IORF，同时具有更好的经济性能。对于 SASP 现场测试，由于地层流体中存在 CO2，注入的强碱 NaOH 使测试的行为与典型的强 ASP 驱不同，这很好地解释了为什么 IORF 比所有其他 SASP 高得多，但扩展性不如其他人严重。本文证实，在大庆油田储层条件下，虽然存在一些细微的不确定性，但导致这两种测试性能差异的原因是碱差异。在提供相同条件的情况下，WASP 优于 SASP。另外，所提供的两次三元复合油田试验的详细资料，可为其他油田实施三元复合驱提供参考。毕竟低油价下三元复合驱提高采收率技术的研究需要很大的远见和决心。尽管存在一些小的不确定性。在提供相同条件的情况下，WASP 优于 SASP。另外，所提供的两次三元复合油田试验的详细资料，可为其他油田实施三元复合驱提供参考。毕竟低油价下三元复合驱提高采收率技术的研究需要很大的远见和决心。尽管存在一些小的不确定性。在提供相同条件的情况下，WASP 优于 SASP。另外，所提供的两次三元复合油田试验的详细资料，可为其他油田实施三元复合驱提供参考。毕竟低油价下三元复合驱提高采收率技术的研究需要很大的远见和决心。