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Compositional simulation of three-phase flow in mixed-wet shale oil reservoir

机译：页岩混合湿油藏三相流组成模拟

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Three-phase flow is often involved during the production of shale oil reservoir. Relative permeability, which is often used to characterize multiphase flow, is found a strong function of wettability. Meanwhile, the mixed wettability in shale reservoir has been well characterized and may have impacts on fluid flow. In this work, to describe the mix-wet condition in shale, matrix is divided into organic and inorganic matrix which are hydrophobic and hydrophilic respectively. Relative permeabilities under different condition of wettability are applied in each kind of matrix. To construct permeability for three-phase flow, water-oil and oil-gas systems are evaluated separately with the assumption that water/gas permeabilities are only functions of their own saturations. Specifically, water-oil relative permeability is obtained by simulating multiphase flow directly on a digital rock sample using the lattice Boltzmann method. Oil-gas relative permeability is calculated from capillary pressure obtained from confined vapor liquid equilibria (VLE) coupled with Young-Laplace equation. Compositional simulation shows that the rich hydrocarbon in organic matrix is difficult to be produced due to the relatively lower permeability and poorer oil mobility under oil-wet condition. Since organic matter is a dispersed phase inside inorganic matter, fluids in organic matrix must flow through inorganic matrix before reaching the fractures. The dispersed nature of organic matter makes the relative permeability in inorganic matrix a dominant factor that controls the overall production in shale oil reservoir. The effect of relative permeability in organic matrix however has limited effect.
机译：页岩油藏生产过程中经常涉及三相流。相对渗透率（通常用于表征多相流）具有很强的润湿性。同时，页岩储层的混合润湿性已被很好地表征，并可能对流体流动产生影响。在这项工作中，为了描述页岩的混湿条件，将基质分为有机基质和无机基质，分别为疏水性和亲水性。每种基质都采用了不同润湿条件下的相对渗透率。为了构造三相流的渗透率，假设水/天然气的渗透率仅是其自身饱和度的函数，则分别评估水-油和油气系统。具体而言，通过使用格子Boltzmann方法直接在数字岩石样本上模拟多相流来获得水油相对渗透率。油气相对渗透率是根据毛细管压力从密闭气液平衡（VLE）与Young-Laplace方程耦合得出的。成分模拟表明，由于在油湿条件下渗透率相对较低，油的流动性较差，因此难以生产有机基质中的富烃。由于有机物是无机物内部的分散相，因此有机基质中的流体在到达裂缝之前必须先流过无机基质。有机质的分散性质使无机基质中的相对渗透率成为控制页岩油储层总产量的主要因素。然而，相对渗透率在有机基质中的作用有限。

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