DEM-LBM simulation of stress-dependent absolute and relative permeabilities in porous media
DEM-LBM simulation of stress-dependent absolute and relative permeabilities in porous media
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DOI：
10.1016/j.ces.2021.116633
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发表时间：
2021-08-10
影响因子：
4.7
通讯作者：
Yin, Xiaolong
中科院分区：
文献类型：
--
作者：
Huang, Jingwei;Xiao, Feng;Yin, Xiaolong
本文采用离散元方法和格子Boltzmann方法研究了多孔介质中与应力相关的绝对渗透率和相对渗透率。压实过程中绝对渗透率与孔隙度的变化符合幂律关系。均质充填体中应力依赖的绝对渗透率与Carman-Kozeny方程的预测结果一致。孔隙度指数因溶洞的存在而增大，但随裂缝的存在而减小。相对渗透率不仅受压实介质孔隙结构的影响，还受流体性质和岩石表面性质的影响。我们的模拟表明，润湿相的相对渗透率略有增加，随着应力的增加，由于形成更连续的路径。非润湿相的相对渗透率随粘度比和毛管数的增加而增加或减小。结果表明，润滑效应对相对磁导率的应力敏感性有重要影响。(c)2021爱思唯尔有限公司保留所有权利。
In this work, stress-dependent absolute and relative permeabilites in porous media are studied using the discrete element method and lattice Boltzmann method. The change of absolute permeability and porosity during compaction is found follow a power-law relation. The stress-dependent absolute permeability in homogeneous pack is in agreement with the prediction of Carman-Kozeny equation. Porosity exponent is increased due to the existence of vugs but is decreased with fractures. Relative permeability, on the other hand, is found not only affected by pore structure of compacted media, but also properties of fluids and rock surface. Our simulations indicate that relative permeability of wetting phase increases slightly with increasing stress, due to the formation of more continuous pathways. Relative permeability of non wetting phase, however, either increases or decreases depending on viscosity ratio and capillary number. It is found that lubrication effects play an important role in the stress sensitivity of relative permeability.(c) 2021 Elsevier Ltd. All rights reserved.