Pore scale experimental and numerical study of surfactant flooding for enhanced oil recovery
Pore scale experimental and numerical study of surfactant flooding for enhanced oil recovery
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表面活性剂驱提高采收率孔隙尺度实验与数值研究
DOI：
10.1016/j.petrol.2020.107999
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发表时间：
2021-01-01
影响因子：
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通讯作者：
Gao, Ziheng
中科院分区：
文献类型：
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作者：
Jing, Wenlong;Fu, Shuaishi;Gao, Ziheng
表面活性剂驱油是提高采收率的传统方法。基于玻璃蚀刻模型的表面活性剂驱油实验，使研究人员可以通过显微镜直接观察表面活性剂如何驱替剩余油，从而探索表面活性剂提高采收率的机理。然而，微观实验大多停留在物理实验的层面，物理实验的操作过于复杂和繁琐。本研究首次将表面活性剂驱油实验与玻璃蚀刻模型的数值模拟相结合。首先，基于真实低渗透油藏岩心的真实孔喉结构，建立了玻璃蚀刻模型，并进行了微油水驱油实验；通过微观观察和分析，结合测试和图像处理技术，定量研究了水驱的影响。然后进行表面活性剂驱油。三种表面活性剂用于驱替。结果表明，孔隙网络中的剩余油大大减少。采收率大大提高。最后，基于微物理实验对水驱和表面活性剂驱进行了数值模拟。数值模拟结果与实验结果进行了比较。结果表明，采收率和剩余油形态基本相同。通过对采收率数值模拟结果的分析，发现在不同界面张力下，表面活性剂提高采收率的程度是不同的。结果表明，界面张力为0.22 mN/m的表面活性剂提高采收率的能力最强。为油田开发中表面活性剂的选择提供了参考。可根据时间、效率和成本等因素选择最佳表面活性剂。
Surfactant flooding is a traditional method to enhance oil recovery. The surfactant flooding experiment based on glass etching model allows researchers to observe directly how the remaining oil is displaced by surfactant through microscope, so as to explore the mechanism of surfactant enhanced oil recovery. However, microscopic experiments mostly stay at the level of physical experiments, and the operation of physical experiments is too complex and cumbersome. This study is the first to combine surfactant flooding experiment with numerical simulation in glass etching model. Firstly, based on the real pore and throat structure of the real low permeability reservoir core, the glass etching model was developed, and the micro-oil-water displacement experiment was carried out. Through microscopic observation and analysis, combined with testing and image processing technology, the effect of water flooding was quantitatively investigated. Then the surfactant flooding was carried out. Three surfactants were used for displacement. It was found that residual oil in pore network was greatly reduced. The recovery factor has been greatly improved. Finally, numerical simulation of water flooding and surfactant flooding based on micro-physical experiment was carried out. The results of numerical simulation were compared with the experimental results. It is found that the recovery factor and the form of residual oil are basically the same. By analyzing the results of numerical simulation of oil recovery, it is found that the extent of surfactant enhancing oil recovery is different under different interfacial tension. The results showed that the surfactant with interfacial tension of 0.22 mN/m has the highest ability to enhance oil recovery. This work provides a reference for surfactant selection in oilfield development. It can select the best surfactant according to the factors of time, efficiency and cost.