In the chemically enhanced oil recovery (CEOR) processes, heavy components in crude oil, such as asphaltenes, adhere to reservoir rocks, significantly impeding crude oil extraction. Surfactants are frequently utilized to improve oil recovery due to their ability to reduce interfacial tension (IFT) and modify surface wettability. Nevertheless, indiscriminate surfactant usage may result in resource wastage and hinder the attainment of optimal recovery outcomes. Therefore, it is urgent to accurately and efficiently screen out optimal surfactants suitable for different oil fields. This work employs fluid density functional theory (FDFT) to investigate the competitive adsorption mechanism of surfactants and asphaltenes on rock interfaces. We examined the impact of surfactants on asphaltene adsorption and determined the optimal surfactant concentration and chain length for differing reservoir electrical properties and asphaltene compositions. Furthermore, a comprehensive assessment of surfactants was conducted, considering both performance and economic factors. The findings contribute to a deeper comprehension of the displacement effect of surfactants on asphaltenes and offer scientific screening solutions for surfactants in oil recovery processes.

中文翻译：

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牺牲表面活性剂以提高石油采收率：流体密度泛函理论研究


在化学提高石油采收率 （CEOR） 过程中，原油中的重成分（如沥青质）会粘附在储层岩石上，严重阻碍原油的开采。表面活性剂经常用于提高石油采收率，因为它们能够降低界面张力 （IFT） 和改变表面润湿性。然而，不加选择地使用表面活性剂可能会导致资源浪费并阻碍实现最佳回收结果。因此，迫切需要准确高效地筛选出适合不同油田的最佳表面活性剂。本工作采用流体密度泛函理论 （FDFT） 研究了表面活性剂和沥青质在岩石界面上的竞争吸附机制。我们研究了表面活性剂对沥青质吸附的影响，并确定了不同储层电性能和沥青质成分的最佳表面活性剂浓度和链长。此外，还考虑了性能和经济因素，对表面活性剂进行了全面评估。这些发现有助于更深入地理解表面活性剂对沥青质的置换效应，并为石油采收过程中的表面活性剂提供科学的筛选解决方案。