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首页> 外文期刊>Fuel >Monitoring of CO_2 and CO_2 oil-based foam flooding processes in fractured low-permeability cores using nuclear magnetic resonance (NMR)
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Monitoring of CO_2 and CO_2 oil-based foam flooding processes in fractured low-permeability cores using nuclear magnetic resonance (NMR)

机译：使用核磁共振（NMR）监测低渗透裂缝岩心中的CO_2和CO_2油基泡沫驱替过程

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摘要

CO2 flooding is an important method in CO2 enhanced oil recovery (EOR) but is usually accompanied by a low efficiency for the fractured low-permeability formation due to CO2 low viscosity and high mobility. In this paper, a comprehensive experimental research effort including flooding and NMR testing is conducted to investigate the oil recovery and mobility control effects of a novel CO2 oil-based foam in fractured low-permeability cores. First, the foaming performance of the compound surfactant SF in crude oil that consists of Span20 and fluorochemical surfactant F-1 is evaluated by the blender stirring method. The surfactant SF exhibits a good foaming performance in crude oil with a foam volume of 290 mL and a half-life of 352 s. The bubble film is notably thickened, which results in a stable oil-based foam. Second, CO2 flooding and CO2 oil-based foam flooding in nonfractured and fractured cores are conducted under reservoir conditions. CO2 oil-based foam flooding can significantly improve the oil recovery and increase the sweep volume of injected CO2. Consequently, the oil recovery in fractured cores increases by 47.8%, and that in nonfractured cores increases by 39.1%. Third, the residual oil saturation in the cores is tested by NMR. The residual oil saturation of fractured and nonfractured cores after CO2 oil-based foam flooding is low and distributed evenly, indicating that CO2 oil-based foam reduces CO2 mobility and yields a relatively uniform displacement throughout the core.
机译：CO 2驱油是提高CO 2采收率（EOR）的重要方法，但由于CO 2低粘度和高流动性，通常伴随着低渗透裂缝形成的低效率。在本文中，进行了包括驱油和NMR测试在内的综合实验研究工作，以研究新型CO2油基泡沫在裂缝性低渗透岩心中的采油率和迁移率控制效果。首先，通过搅拌器搅拌法评价由Span20和含氟表面活性剂F-1组成的复合表面活性剂SF在原油中的发泡性能。表面活性剂SF在原油中表现出良好的起泡性能，泡沫体积为290 mL，半衰期为352 s。气泡膜明显增厚，从而得到稳定的油基泡沫。其次，在储层条件下，在未破裂和破裂的岩心中进行了CO2驱油和CO2油基泡沫驱油。基于CO2的油基泡沫驱可以显着提高采收率并增加注入的CO2的扫掠量。因此，裂隙岩心的采油率提高了47.8％，非裂隙岩心的采油率提高了39.1％。第三，通过NMR测试岩心中的剩余油饱和度。 CO2油基泡沫驱替后，破裂和未破裂岩心的剩余油饱和度很低且分布均匀，这表明CO2油基泡沫降低了CO2的流动性并在整个岩心中产生相对均匀的位移。

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  • 来源
    《Fuel》 |2020年第1期|116648.1-116648.11|共11页
  • 作者

    Li Songyan; Wang Qun; Zhang Kaiqiang; Li Zhaomin;

  • 作者单位

    China Univ Petr East China Minist Educ Key Lab Unconvent Oil & Gas Dev Qingdao 266580 Shandong Peoples R China|China Univ Petr East China Sch Petr Engn Qingdao 266580 Shandong Peoples R China;

    China Univ Petr East China Sch Petr Engn Qingdao 266580 Shandong Peoples R China;

    Imperial Coll London Dept Chem Engn South Kensington Campus London SW7 2AZ England;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Carbon dioxide; Oil-based foam; Fractured core; NMR; Oil recovery;

    机译：二氧化碳;油基泡沫;核心破裂;NMR;采油;

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