孔隙尺度洞察强湿和弱湿天然裂缝中的相对渗透性:晶格玻尔兹曼法二维模拟研究

IF 4 2区 环境科学与生态学 Q1 WATER RESOURCES
F.F. Munarin , P. Gouze , F. Nepomuceno Filho
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引用次数: 0

摘要

裂缝中油气等两相流动的简化观点通常假定为分层流动。然而,最近的研究和生产实践表明,裂缝中的两相流动表现出多种流动模式。本文研究了裂缝孔径、流体粘度和润湿性对三维贝里亚裂缝二维截面中两相流的控制。网格玻尔兹曼法(LBM)模拟用于模拟这些特性对相对渗透率曲线的影响。值得注意的是,在强湿润断裂中,出现了两种截然不同的渗透机制。高孔径值表现出类似于平行平面的行为,而低孔径值则由于裂缝表面之间的流体相互作用导致渗透率线性下降。相反,在特定孔径范围内的弱湿裂缝中,相对渗透率曲线表现异常。这种行为与裂缝内出现的特定流动模式有关。结果还强调,粘度比的变化不会影响异常行为的存在或饱和范围,但会影响每种流体的异常行为强度。与 Poiseuille 曲线方程的比较显示,断裂粗糙度的影响有限。这些发现加深了我们对孔径、粘度和润湿性之间的相互作用以及它们如何控制相对渗透率曲线形状的理解。这些曲线是石油和天然气应用中连续尺度建模(储层模型)的关键参数。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Pore-scale insights into relative permeability in strongly and weakly wet natural fractures: A Lattice Boltzmann Method 2D simulation study

The simplified view of two-phase flow, such as oil and gas, in a fracture is often assumed to occur in a stratified behavior. However, recent studies and production practices have revealed that two-phase flow in fractures exhibits diverse flow patterns. This paper investigates the control of the fracture aperture, fluids viscosity, and wettability on two-phase flow in a 2D cross section of a 3D Berea fracture. Lattice Boltzmann Method (LBM) simulations are used to model the impact of these properties on relative permeability curves. Notably, in strongly wet fractures, two distinct permeability regimes emerge. High aperture values exhibit behavior resembling parallel planes, while low aperture values lead to a linear decrease in permeability due to fluid interactions between fracture surfaces. Conversely, anomalous behavior of the relative permeability curves is identified in weakly wet fractures within specific aperture ranges. This behavior is associated with the occurrence of specific flow patterns within the fracture. Results also emphasize that changes in viscosity ratio do not affect the presence or the saturation range of the anomalous behavior but do influence its intensity for each fluid. Comparisons with Poiseuille profile equations reveal the limited impact of the fracture roughness. These findings enhance our understanding of the interactions between aperture, viscosity, and wettability and how they control the shape of the relative permeability curves. These curves are pivotal parameters for the continuum scale modeling (reservoir models) in oil and gas application, for instance.

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来源期刊
Advances in Water Resources
Advances in Water Resources 环境科学-水资源
CiteScore
9.40
自引率
6.40%
发文量
171
审稿时长
36 days
期刊介绍: Advances in Water Resources provides a forum for the presentation of fundamental scientific advances in the understanding of water resources systems. The scope of Advances in Water Resources includes any combination of theoretical, computational, and experimental approaches used to advance fundamental understanding of surface or subsurface water resources systems or the interaction of these systems with the atmosphere, geosphere, biosphere, and human societies. Manuscripts involving case studies that do not attempt to reach broader conclusions, research on engineering design, applied hydraulics, or water quality and treatment, as well as applications of existing knowledge that do not advance fundamental understanding of hydrological processes, are not appropriate for Advances in Water Resources. Examples of appropriate topical areas that will be considered include the following: • Surface and subsurface hydrology • Hydrometeorology • Environmental fluid dynamics • Ecohydrology and ecohydrodynamics • Multiphase transport phenomena in porous media • Fluid flow and species transport and reaction processes
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