Modeling of multiphase flow in low permeability porous media: Effect of wettability and Capillary numbers

IF 2.5 4区工程技术 Q2 ENGINEERING, MECHANICAL Journal of Porous Media Pub Date : 2024-07-01 DOI:10.1615/jpormedia.2024053606

Mingjing Lu, Yuegang Wang

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Abstract

Shale oil reservoirs are characterized by dense, extremely low permeability, and poorly developed natural fractures, and hydraulic fracturing technology is often used in extraction to improve recovery. It is significant to clarify the mechanism and influence mechanism of the displacement in complex porous media coupled with fractures and matrix to enhance oil recovery. In this study, based on the lattice Boltzmann method utilizing the fracture-matrix pore coupling model, the authors carried out a study of displacement in organic and inorganic pore space and systematically investigated the influence mechanisms of wettability and Ca on the crude oil recovery rate. It was found that the stronger the wettability of the water phase, the higher the crude oil recovery rate, and the lower the residual oil in the form of adsorbed oil film; and the larger the Capillary numbers, the higher the crude oil recovery rate. Crude oil in organic pore space is more difficult to discharge compared with that in inorganic pore space, and the recovery rate of crude oil in organic pore space can be effectively improved by increasing the driving pressure and enhancing the properties of the water phase (fracturing fluid).

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低渗透性多孔介质中的多相流建模：润湿性和毛细管数的影响

页岩油藏的特点是致密、渗透率极低、天然裂缝不发育，在开采中通常采用水力压裂技术提高采收率。阐明裂缝与基质耦合的复杂多孔介质中位移的机理和影响机制对提高石油采收率意义重大。在这项研究中，作者基于晶格玻尔兹曼法，利用裂缝-基质孔隙耦合模型，开展了有机和无机孔隙空间位移研究，系统研究了润湿性和 Ca 对原油采收率的影响机理。研究发现，水相润湿性越强，原油采收率越高，以吸附油膜形式存在的残油越少；毛细管数越大，原油采收率越高。有机孔隙中的原油比无机孔隙中的原油更难排出，通过增加驱动压力和提高水相（压裂液）的性能，可以有效提高有机孔隙中的原油采收率。

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来源期刊

Journal of Porous Media 工程技术-工程：机械

CiteScore

3.50

自引率

8.70%

发文量

审稿时长

12.5 months

期刊介绍： The Journal of Porous Media publishes original full-length research articles (and technical notes) in a wide variety of areas related to porous media studies, such as mathematical modeling, numerical and experimental techniques, industrial and environmental heat and mass transfer, conduction, convection, radiation, particle transport and capillary effects, reactive flows, deformable porous media, biomedical applications, and mechanics of the porous substrate. Emphasis will be given to manuscripts that present novel findings pertinent to these areas. The journal will also consider publication of state-of-the-art reviews. Manuscripts applying known methods to previously solved problems or providing results in the absence of scientific motivation or application will not be accepted. Submitted articles should contribute to the understanding of specific scientific problems or to solution techniques that are useful in applications. Papers that link theory with computational practice to provide insight into the processes are welcome.