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Direct Numerical Simulation of Pore-Scale Trapping Events During Capillary-Dominated Two-Phase Flow in Porous Media
Transport in Porous Media ( IF 2.7 ) Pub Date : 2021-05-28 , DOI: 10.1007/s11242-021-01619-w
Mosayeb Shams , Kamaljit Singh , Branko Bijeljic , Martin J. Blunt

This study focuses on direct numerical simulation of imbibition, displacement of the non-wetting phase by the wetting phase, through water-wet carbonate rocks. We simulate multiphase flow in a limestone and compare our results with high-resolution synchrotron X-ray images of displacement previously published in the literature by Singh et al. (Sci Rep 7:5192, 2017). We use the results to interpret the observed displacement events that cannot be described using conventional metrics such as pore-to-throat aspect ratio. We show that the complex geometry of porous media can dictate a curvature balance that prevents snap-off from happening in spite of favourable large aspect ratios. We also show that pinned fluid-fluid-solid contact lines can lead to snap-off of small ganglia on pore walls; we propose that this pinning is caused by sub-resolution roughness on scales of less than a micron. Our numerical results show that even in water-wet porous media, we need to allow pinned contacts in place to reproduce experimental results.



中文翻译:

多孔介质中毛细管主导的两相流过程中孔隙尺度捕集事件的直接数值模拟

本研究侧重于直接数值模拟渗吸,非湿相被湿相置换,通过水湿碳酸盐岩。我们模拟石灰岩中的多相流,并将我们的结果与 Singh 等人先前在文献中发表的高分辨率同步加速器 X 射线位移图像进行比较。(Sci Rep 7:5192, 2017)。我们使用结果来解释观察到的位移事件,这些事件无法使用常规指标(例如孔喉纵横比)进行描述。我们表明,多孔介质的复杂几何形状可以决定曲率平衡,尽管具有有利的大纵横比,但仍可防止发生折断。我们还表明,固定的流体 - 流体 - 固体接触线会导致孔壁上的小神经节折断;我们认为这种钉扎是由小于微米尺度的亚分辨率粗糙度引起的。我们的数值结果表明,即使在水润湿的多孔介质中,我们也需要允许固定接触到位以重现实验结果。

更新日期:2021-05-28
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