Wang Zhongzheng, Pereira Jean-Michel, Gan Yixiang
School of Civil Engineering, The University of Sydney, Sydney, 2006, New South Wales , Australia.
Navier, Ecole des Ponts, Université Gustave Eiffel, CNRS, 77420, Marne-la-Vallée, France.
Langmuir. 2020 Mar 10;36(9):2449-2458. doi: 10.1021/acs.langmuir.9b03780. Epub 2020 Feb 25.
The effects of wettability on multiphase displacement in porous media have been studied extensively in the past, and the contact angle is identified as an important factor influencing the displacement patterns. At the same time, it has been found that the effective contact angle can vary drastically in a time-dependent manner on rough surfaces due to the Cassie-Wenzel wetting transition. In this study, we develop a theoretical model at the pore scale describing the apparent contact angle on a rough interface as a function of time. The theory is then incorporated into the lattice Boltzmann method for simulation of multiphase displacement in disordered porous media. A dimensionless time ratio, , describing the relative speed of the wetting transition and pore invasion is defined. We show that the displacement patterns can be significantly influenced by , where more trapped defending ganglia are observed at large values, leading to lower displacement efficiency. We investigate the mobilization of trapped ganglia through identifying different mobilization dynamics during displacement, including translation, coalescence, and fragmentation. Agreement is observed between the mobilization statistics and the total pressure gradient across a wide range of values. Understanding the effect of the wetting transition during multiphase displacement in porous media is of importance for applications such as carbon geosequestration and oil recovery, especially for porous media where solid surface roughness cannot be neglected.
过去，人们对润湿性对多孔介质中多相驱替的影响进行了广泛研究，接触角被认为是影响驱替模式的一个重要因素。同时，研究发现由于卡西-文泽尔润湿转变，在粗糙表面上有效接触角会随时间急剧变化。在本研究中，我们建立了一个孔隙尺度的理论模型，将粗糙界面上的表观接触角描述为时间的函数。然后将该理论纳入格子玻尔兹曼方法，用于模拟无序多孔介质中的多相驱替。定义了一个无量纲时间比，用于描述润湿转变和孔隙侵入的相对速度。我们表明，驱替模式会受到的显著影响，在较大值时会观察到更多被困的防御性液滴，导致驱替效率降低。我们通过识别驱替过程中不同的运移动力学，包括平移、聚并和破碎，来研究被困液滴的运移。在广泛的值范围内，运移统计数据与总压力梯度之间存在一致性。了解多孔介质中多相驱替过程中润湿转变的影响对于碳地质封存和石油开采等应用非常重要，特别是对于不能忽略固体表面粗糙度的多孔介质。
