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Investigation of gravity-stable surfactant floods

机译：重力稳定表面活性剂驱的研究

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摘要

Classical stability theory can be used to estimate the critical velocity of a miscible flood stabilized by gravity forces. However, stability theory for an ultra-low interfacial tension (IFT) surfactant displacement is not well developed or validated. In this paper, a method for predicting the critical velocity for a surfactant flood is proposed taking into account the microemulsion phase. Vertical upward surfactant displacement experiments were performed in sandpacks at velocities of 0.2, 0.4, 0.8 ft/day. The surfactant flood at 0.2 ft/day was a nearly stable displacement whereas the floods at 0.4 and 0.8 ft/day were unstable with visually obvious fingers. The stability theory is in good agreement with experimental results. The proposed theory and experimental results offer new insight into the behavior of surfactant floods stabilized by gravity forces and in particular the importance of the microemulsion phase and its properties, especially its viscosity. It is very important to measure the microemulsion viscosity and account for its effect on the critical velocity. Furthermore, the microemulsion viscosity can be optimized to improve the velocity for a stable displacement. This insight opens up a new pathway for optimizing surfactant floods without mobility control. It is possible to design an efficient surfactant flood without any mobility control if the surfactant solution is injected at a low velocity in horizontal wells at the bottom of the geological zone and the oil captured in horizontal wells at the top of the zone. This approach is practical if the vertical permeability of the geological zone is high. Under favorable reservoir conditions, gravity-stable surfactant floods may be an attractive alternative to surfactant-polymer floods.
机译：经典稳定性理论可用于估算重力作用稳定的混相洪水的临界速度。但是，关于超低界面张力（IFT）表面活性剂置换的稳定性理论尚未得到很好的开发或验证。在本文中，考虑到微乳液相，提出了一种预测表面活性剂溢流的临界速度的方法。在沙袋中以0.2、0.4、0.8 ft / day的速度进行垂直向上的表面活性剂置换实验。表面活性剂以0.2英尺/天的流量几乎是稳定的位移，而0.4和0.8英尺/天的流量在视觉上明显的手指上是不稳定的。稳定性理论与实验结果吻合良好。提出的理论和实验结果为通过重力稳定的表面活性剂驱替的行为提供了新的见解，尤其是微乳液相及其特性（尤其是粘度）的重要性。测量微乳液粘度并考虑其对临界速度的影响非常重要。此外，可以优化微乳液粘度以提高速度以获得稳定的位移。这种见解开辟了一条新的途径，可以在无需进行流动性控制的情况下优化表面活性剂的注入。如果将表面活性剂溶液以低速注入地质区底部的水平井中，并将油捕获在该区顶部的水平井中，则可以设计出一种高效的表面活性剂驱替，而无需进行任何流动性控制。如果地质带的垂直渗透率很高，则此方法很实用。在有利的储层条件下，重力稳定的表面活性剂驱替可能是表面活性剂-聚合物驱的诱人替代品。

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  • 来源
    《Fuel》 |2014年第15期|76-84|共9页
  • 作者

    Jun Lu; Upali P. Weerasooriya; Gary A. Pope;

  • 作者单位

    Department of Petroleum and Geosystems Engineering, The University of Texas at Austin, United States;

    Department of Petroleum and Geosystems Engineering, The University of Texas at Austin, United States;

    Department of Petroleum and Geosystems Engineering, The University of Texas at Austin, United States;

  • 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

    Chemical enhanced oil recovery (EOR); Surfactant flooding; Gravity stability; Microemulsion viscosity;

    机译：化学强化采油（EOR）;表面活性剂泛滥;重力稳定性;微乳液粘度;

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