Two-phase flow properties in aperture-based fractures under normal deformation conditions: Analytical approach and numerical simulation
Two-phase flow properties in aperture-based fractures under normal deformation conditions: Analytical approach and numerical simulation
复制标题
正常变形条件下基于孔隙的裂缝的两相流特性：分析方法和数值模拟
DOI：
10.1016/j.jhydrol.2016.12.017
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发表时间：
2017-02
影响因子：
6.4
通讯作者：
Cheng Aiping
中科院分区：
文献类型：
--
作者：
Ye Zuyang;Liu Hui-Hai;Jiang Qinghui;Liu Yanzhang;Cheng Aiping
提出了一种系统的方法来估算正常变形条件下水平裂缝的两相流动特性。基于高斯孔径分布和局部平行板模型的假设，得到了一个简单的封闭模型，用于预测润湿相和非润湿相的毛细压力-饱和度关系。还开发了三个概念模型来表征相对渗透率行为。为了研究法向变形对两相流动特性的影响，在渗透模型的基础上，将法向变形用最大空隙闭合度来表示。采用严格的逐次随机加法（SRA）方法生成基于孔隙的裂缝，并采用基于侵入渗流（IP）模型的数值方法模拟润湿相和非润湿相之间的毛细主导位移。所提出的模型部分验证了实验室数据和数值计算不考虑变形。在大法向变形条件下，宏观模型与模拟结果吻合较好。模拟结果表明，毛管压力、相对渗透率与饱和度的关系、相干扰、相结构、剩余饱和度额定参数和曲折因子等两相流特性对孔隙分布和法向变形的空间相关性高度敏感。
A systematic method has been proposed to estimate the two-phase flow properties of horizontal fractures under normal deformation condition. Based on Gaussian aperture distributions and the assumption of local parallel plate model, a simple model was obtained in closed form to predict the capillary pressure-saturation relationships for both wetting and non-wetting phases. Three conceptual models were also developed to characterize the relative permeability behaviors. In order to investigate the effect of normal deformation on two-phase flow properties, the normal deformation could be represented with the maximum void space closure on the basis of penetration model. A rigorous successive random addition (SRA) method was used to generate the aperture-based fractures and a numerical approach based on invasion percolation (IP) model was employed to model capillary-dominated displacements between wetting and non-wetting phases. The proposed models were partially verified by a laboratory dataset and numerical calculations without consideration of deformation. Under large normal deformations, it was found that the macroscopic model is in better agreement with simulated observations. The simulation results demonstrated that the two-phase flow properties including the relationships between capillary pressure, relative permeability and saturation, phase interference, phase structures, residual-saturation-rated parameters and tortuosity factor, were highly sensitive to the spatial correlation of aperture distribution and normal deformation.
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