断裂多孔介质中粘性起毛的数值模拟

IF 2.7 3区 工程技术 Q3 ENGINEERING, CHEMICAL
Runar L. Berge, Inga Berre, Eirik Keilegavlen, Jan M. Nordbotten
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引用次数: 0

摘要

我们利用高分辨率数值模拟研究了高渗透性断裂网络引起的异质性对多孔介质中粘性混溶指配的影响。我们考虑了将粘性较低的流体平面注入粘性较高的流体饱和的二维断裂多孔介质的问题。这个问题包含两组根本不同的优先流动状态:第一组是由粘性指状作用引起的,第二组是由裂缝和岩石基质之间的渗透性对比引起的。我们研究了从粘性不稳定性主导的流动机制向断裂引起的异质性确定流动路径机制的过渡。我们的研究结果表明,即使岩石基质和裂缝之间存在微小的渗透性差异,也会对粘性指状流的行为产生重大影响。粘度对比和渗透率对比之间的相互作用导致粘度较低的流体优先通过裂缝。因此,这种导流过程稳定了岩石基质中的位移前沿,最终抑制了粘指现象的发生,尤其是在渗透率对比较高的情况下。我们探索了三种断裂几何形态:两种结构化和一种随机配置,并确定了这些几何形态与不稳定流发展之间复杂的相互作用。我们发现,决定断裂网络影响的最重要因素是流经断裂和岩石基质的流体体积比,而交叉机制的确切点则取决于断裂网络的几何形状。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Numerical Simulations of Viscous Fingering in Fractured Porous Media

Numerical Simulations of Viscous Fingering in Fractured Porous Media

The effect of heterogeneity induced by highly permeable fracture networks on viscous miscible fingering in porous media is examined using high-resolution numerical simulations. We consider the planar injection of a less viscous fluid into a two-dimensional fractured porous medium that is saturated with a more viscous fluid. This problem contains two sets of fundamentally different preferential flow regimes; the first is caused by the viscous fingering, and the second is due to the permeability contrasts between the fractures and the rock matrix. We study the transition from the regime where the flow is dominated by the viscous instabilities, to the regime where the heterogeneity induced by the fractures define the flow paths. Our findings reveal that even minor permeability differences between the rock matrix and fractures significantly influence the behavior of viscous fingering. The interplay between the viscosity contrast and permeability contrast leads to the preferential channeling of the less viscous fluid through the fractures. Consequently, this channeling process stabilizes the displacement front within the rock matrix, ultimately suppressing the occurrence of viscous fingering, particularly for higher permeability contrasts. We explore three fracture geometries: two structured and one random configuration and identify a complex interaction between these geometries and the development of unstable flow. While we find that the most important factor determining the effect of the fracture network is the ratio of fluid volume flowing through the fractures and the rock matrix, the exact point for the cross-over regime is dependent on the geometry of the fracture network.

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来源期刊
Transport in Porous Media
Transport in Porous Media 工程技术-工程:化工
CiteScore
5.30
自引率
7.40%
发文量
155
审稿时长
4.2 months
期刊介绍: -Publishes original research on physical, chemical, and biological aspects of transport in porous media- Papers on porous media research may originate in various areas of physics, chemistry, biology, natural or materials science, and engineering (chemical, civil, agricultural, petroleum, environmental, electrical, and mechanical engineering)- Emphasizes theory, (numerical) modelling, laboratory work, and non-routine applications- Publishes work of a fundamental nature, of interest to a wide readership, that provides novel insight into porous media processes- Expanded in 2007 from 12 to 15 issues per year. Transport in Porous Media publishes original research on physical and chemical aspects of transport phenomena in rigid and deformable porous media. These phenomena, occurring in single and multiphase flow in porous domains, can be governed by extensive quantities such as mass of a fluid phase, mass of component of a phase, momentum, or energy. Moreover, porous medium deformations can be induced by the transport phenomena, by chemical and electro-chemical activities such as swelling, or by external loading through forces and displacements. These porous media phenomena may be studied by researchers from various areas of physics, chemistry, biology, natural or materials science, and engineering (chemical, civil, agricultural, petroleum, environmental, electrical, and mechanical engineering).
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