【摘要】 利用CO₂进行气体混相驱油，因其具有驱油效率高、利于环境保护等优点而受到广泛关注。其中，CO₂/油体系的界面张力对原油采收率有着显著影响，界面张力越小，驱油效率越高。然而，在许多研究中，虽然有关界面张力的研究繁多，但多数介绍了实验研究方法而忽略了理论研究方法，且少有各种方法之间的比较研究，导致研究过程中对方法的选取没有统一的标准。因此，本文首先介绍了CO₂混相驱采收率提升的现状及机理；其次从理论和实验两方面梳理了界面张力的确定方法，并分析了每种方法的优缺点；最后对未来界面张力测定方法的发展方向做出了展望。可为后续混相驱稠油开采技术实际工程应用提供指导。更多还原

【Abstract】 CO₂ miscible flooding for oil recovery has attracted widespread attention because of its high displacement efficiency and environmental friendliness. Among them, the interfacial tension of CO₂/oil systems has a significant impact on crude oil recovery. The smaller the interfacial tension, the higher the flooding efficiency. However, in the current researches, although there are many studies on interfacial tension, most of them introduce experimental research methods and ignore theoretical research methods, and there are few comparative studies between various methods, resulting in no uniform standard for the selection of methods in the research process. Therefore, the current status and mechanism of CO₂ miscible flooded for oil recovery enhancement are introduced. Then, the methods for determining interfacial tension are sorted out from both theoretical and experimental aspects, and the advantages and disadvantages of each method are analyzed. Finally, the future development directions of interfacial tension measurement methods are prospected. This paper can provide guidance for the practical engineering application of miscible flooding heavy oil extraction.更多还原