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Impact of Pore-Scale Characteristics on Immiscible Fluid Displacement
Geofluids ( IF 1.7 ) Pub Date : 2020-05-15 , DOI: 10.1155/2020/5759023
Nariman Mahabadi 1 , Leon van Paassen 2 , Ilenia Battiato 3 , Tae Sup Yun 4 , Hyunwook Choo 5 , Jaewon Jang 6
Affiliation  

Immiscible fluid flows (drainage displacement) where nonwetting fluid invades porous media filled with wetting fluid are frequently observed. Numerous studies have confirmed the existence of three different displacement patterns which depend on the viscosity ratio and capillary number: stable displacement, viscous fingering, and capillary fingering. However, the phase boundary and displacement efficiency of each displacement pattern can vary significantly depending on the characteristics of the experimental and numerical tools employed. In this study, a three-dimensional (3D) tube network model was extracted from 3D X-ray computed tomography images of natural sand. The extracted network model was used to quantitatively outline the phase boundary of the displacement pattern and to examine the displacement efficiency for wide ranges of viscosity ratios and capillary numbers. Moreover, the effects of the tube size distribution and tube connectivity on the displacement characteristics were investigated. A transition regime between the viscous fingering and capillary fingering zones with regard to the displacement efficiency was observed for the first time. As the tube size distribution became uniform, the viscosity effect increased. As the tube connectivity decreased to ~4.6, the phase boundary became similar to that of a two-dimensional network. The characteristic changes of the phase boundary and displacement efficiency were highlighted through local gradient diagrams.

中文翻译:

孔隙尺度特征对非混相流体驱替的影响

经常观察到不混溶流体流动(排水置换),其中非润湿流体侵入充满润湿流体的多孔介质。大量研究已经证实存在三种不同的驱替模式,这取决于粘度比和毛细管数:稳定驱替、粘性指法和毛细管指法。然而,根据所使用的实验和数值工具的特性,每个位移模式的相界和位移效率可能会有很大差异。在这项研究中,从天然砂的 3D X 射线计算机断层扫描图像中提取了一个三维 (3D) 管网络模型。提取的网络模型用于定量描绘置换模式的相边界,并检查各种粘度比和毛细管数的置换效率。此外,研究了管尺寸分布和管连通性对位移特性的影响。首次观察到粘性指法区和毛细指法区在驱替效率方面的过渡状态。随着管尺寸分布变得均匀,粘度效应增加。随着管连通性降低到~4.6,相界变得类似于二维网络的相界。通过局部梯度图突出了相界和置换效率的特征变化。研究了管尺寸分布和管连通性对位移特性的影响。首次观察到粘性指法区和毛细指法区在驱替效率方面的过渡状态。随着管尺寸分布变得均匀,粘度效应增加。随着管连通性降低到~4.6,相界变得类似于二维网络的相界。通过局部梯度图突出了相界和置换效率的特征变化。研究了管尺寸分布和管连通性对位移特性的影响。首次观察到粘性指法区和毛细指法区在驱替效率方面的过渡状态。随着管尺寸分布变得均匀,粘度效应增加。随着管连通性降低到~4.6,相界变得类似于二维网络的相界。通过局部梯度图突出了相界和置换效率的特征变化。首次观察到粘性指法区和毛细指法区在驱替效率方面的过渡状态。随着管尺寸分布变得均匀,粘度效应增加。随着管连通性降低到~4.6,相界变得类似于二维网络的相界。通过局部梯度图突出了相界和置换效率的特征变化。首次观察到粘性指法区和毛细指法区在驱替效率方面的过渡状态。随着管尺寸分布变得均匀,粘度效应增加。随着管连通性降低到~4.6,相界变得类似于二维网络的相界。通过局部梯度图突出了相界和置换效率的特征变化。
更新日期:2020-05-15
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