基于数字核心技术的两相非饱和细观渗流模拟研究

IF 2.8 3区 工程技术 Q1 MATHEMATICS, INTERDISCIPLINARY APPLICATIONS
Xudi Wu, Wei Liu, Xuefei Zou, Jingyu Cao, Jianfeng Xiao, Cai Deng
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引用次数: 0

摘要

近年来,数字核心技术作为一种新兴的数值模拟方法被广泛应用于各个领域。研究了砂岩孔喉结构中气水相非饱和微观渗流问题。首先,采用数字岩心CT扫描技术提取砂岩真实三维孔喉结构;然后,基于可视化图像处理技术,建立了非饱和细观渗流的三维数值模型。其次,利用两相体积平均动量方程和连续性方程建立了两相非饱和渗流耦合方程。最后,结合两相饱和关系、van Genuchten模型和Mualem模型,实现了真实砂岩孔喉结构中两相非饱和渗流的模拟。结果表明,该模型的有效孔隙度和渗透率分别为14.97%和21.5 mD。在非饱和渗流过程中,由于优势通道的存在,润湿相饱和度的变化并不均匀。大孔喉处的流线密度较大,流体流速较快。模型中两相在不同位置的相对渗透率相似。相对渗透率曲线呈凹形。非润湿相的最终相对渗透率近似等于1。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Simulation study on the two-phase unsaturated microscopic seepage based on digital core technology

Simulation study on the two-phase unsaturated microscopic seepage based on digital core technology

Simulation study on the two-phase unsaturated microscopic seepage based on digital core technology

In recent years, digital core technology as an emerging numerical simulation method has been widely used in various fields. This study investigates the unsaturated microscopic seepage of gas–water phases in the pore-throat structure of sandstone. First, the real three-dimensional pore-throat structure of sandstone is extracted by digital core CT scanning technique. Then, a 3D numerical model that used in the unsaturated microscopic seepage is established based on the visualization image processing technology. Next, the two-phase unsaturated seepage coupling equations are developed by using the two-phase volume-averaged momentum equation and the continuity equation. Finally, by combining the two-phase saturation relation, the van Genuchten model, and the Mualem model, we realize the simulation of the two-phase unsaturated seepage in a real pore-throat structure of sandstone. The results demonstrate that the effective porosity and permeability of the model are 14.97% and 21.5 mD, respectively. The variation of wetting phase saturation is not uniform due to the existence of dominant channels in the unsaturated seepage process. The streamlines at the large pore throat are denser than elsewhere, and the velocity of the fluid is faster. The relative permeabilities of the two phases at different positions in the model are similar. Moreover, the shape of the relative permeability curve is concave. The final relative permeability of the non-wetting phase is approximately equal to 1.

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来源期刊
Computational Particle Mechanics
Computational Particle Mechanics Mathematics-Computational Mathematics
CiteScore
5.70
自引率
9.10%
发文量
75
期刊介绍: GENERAL OBJECTIVES: Computational Particle Mechanics (CPM) is a quarterly journal with the goal of publishing full-length original articles addressing the modeling and simulation of systems involving particles and particle methods. The goal is to enhance communication among researchers in the applied sciences who use "particles'''' in one form or another in their research. SPECIFIC OBJECTIVES: Particle-based materials and numerical methods have become wide-spread in the natural and applied sciences, engineering, biology. The term "particle methods/mechanics'''' has now come to imply several different things to researchers in the 21st century, including: (a) Particles as a physical unit in granular media, particulate flows, plasmas, swarms, etc., (b) Particles representing material phases in continua at the meso-, micro-and nano-scale and (c) Particles as a discretization unit in continua and discontinua in numerical methods such as Discrete Element Methods (DEM), Particle Finite Element Methods (PFEM), Molecular Dynamics (MD), and Smoothed Particle Hydrodynamics (SPH), to name a few.
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