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A new formulation of apparent permeability for gas transport in shale

机译:页岩中天然气运移表观渗透率的新公式

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Recently, a few apparent permeability formulations have been proposed for gas transport in tight formations aiming of correcting flow deviation caused by slip flow and Knudsen diffusion. However, the effect of surface diffusion has always been neglected. Surface diffusion happens when gas molecules adsorb on the solid surface. Considering significant proportion of adsorbed gas (20%-80%) in shale, surface diffusion could play an important role during gas transport. In this paper, we presented a new apparent permeability formulation, which takes surface diffusion into account, for gas transport in shale. The parametric study of the presented formulation shows apparent permeability is sensitive to pressure, temperature, pore radius and surface roughness. The permeability caused by surface diffusion can be several times larger than shale intrinsic permeability at low pressure. Neglecting surface diffusion in the formulation would underestimate gas flux by 25%. (C) 2015 Elsevier B.V. All rights reserved.
机译:近来,已经提出了一些用于在致密地层中进行气体输送的表观渗透率公式,其目的是校正由滑流和克努森扩散引起的流量偏差。然而,表面扩散的影响一直被忽略。当气体分子吸附在固体表面上时,就会发生表面扩散。考虑到页岩中吸附气体的比例很大(20%-80%),表面扩散可能在天然气运输中起重要作用。在本文中,我们提出了一种新的表观渗透率公式,该公式考虑了页岩中气体传输的表面扩散。所提出配方的参数研究表明,表观渗透率对压力,温度,孔半径和表面粗糙度敏感。由表面扩散引起的渗透率可能比低压下的页岩固有渗透率大几倍。忽略配方中的表面扩散会使气体通量低估25%。 (C)2015 Elsevier B.V.保留所有权利。

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