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首页> 外文期刊>Advances in Water Resources >Matrix-fracture transfer shape factor for modeling flow of a compressible fluid in dual-porosity media
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Matrix-fracture transfer shape factor for modeling flow of a compressible fluid in dual-porosity media

机译：用于模拟双孔隙介质中可压缩流体流动的基质断裂传递形状因子

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摘要

The matrix-fracture transfer shape factor is one of the important parameters in the modeling of fluid flow in fractured porous media using a dual-porosity concept. Warren and Root [36] introduced the dual-porosity concept and suggested a relation for the shape factor. There is no general relationship for determining the shape factor for a single-phase flow of slightly compressible fluids. Therefore, different studies reported different values for this parameter, as an input into the flow models. Several investigations have been reported on the shape factor for slightly compressible fluids. However, the case of compressible fluids has not been investigated in the past. The focus of this study is, therefore, to find the shape factor for the single-phase flow of compressible fluids (gases) in fractured porous media. In this study, a model for the determination of the shape factor for compressible fluids is presented; and, the solution of nonlinear gas diffusivity equation is used to derive the shape factor. The integral method and the method of moments are used to solve the nonlinear governing equation by considering the pressure dependency of the viscosity and isothermal compressibility of the fluid. The approximate semi-analytical model for the shape factor presented in this study is verified using single-porosity, fine-grid, numerical simulations. The dependency of the shape factor on the gas specific gravity, pressure and temperature are also investigated. The theoretical analysis presented improves our understanding of fluid flow in fractured porous media. In addition, the developed matrix-fracture transfer shape factor can be used as an input for modeling flow of compressible fluids in dual-porosity systems, such as naturally fractured gas reservoirs, coal-bed methane reservoirs and fractured tight gas reservoirs.
机译：基质-裂缝传递形状因子是使用双孔隙率概念模拟裂缝多孔介质中流体流动的重要参数之一。 Warren和Root [36]引入了双重孔隙的概念，并提出了形状因子的关系。确定微压缩流体的单相流的形状因数没有一般关系。因此，不同的研究报告了该参数的不同值，作为流量模型的输入。关于轻微可压缩流体的形状因数的研究已有报道。但是，过去没有研究可压缩流体的情况。因此，本研究的重点是找到压裂多孔介质中可压缩流体（气体）单相流动的形状因子。在这项研究中，提出了一种确定可压缩流体形状因子的模型。然后，使用非线性气体扩散率方程的解来导出形状因子。考虑流体的黏度和流体的等温压缩性，采用积分法和矩量法求解非线性控制方程。使用单孔隙度，细网格，数值模拟验证了本研究中提出的形状因子的近似半分析模型。还研究了形状因数对气体比重，压力和温度的依赖性。提出的理论分析提高了我们对裂缝性多孔介质中流体流动的理解。此外，开发的基体-裂缝传递形状因子可以用作模拟双孔隙度系统中可压缩流体流动的输入，例如天然裂缝气藏，煤层甲烷气藏和致密致密气藏。

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