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首页> 外文期刊>Journal of natural gas science and engineering >Analysis of the influence of wettability on permeability in hydrate-bearing porous media using pore network models combined with computed tomography
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Analysis of the influence of wettability on permeability in hydrate-bearing porous media using pore network models combined with computed tomography

机译：孔隙网络模型结合计算机断层摄影技术分析润湿性对含水多孔介质渗透性的影响

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摘要

The permeability of hydrate-bearing porous media is one of the most important factors in predicting fluid flow behavior, fluid distribution, and gas performance during hydrate exploitation. The wettability of porous media greatly affects the relative permeability of two-phase gas-water mixtures. In this paper, we extend our previous investigation into the effects of the wettability of porous media containing hydrates on their seepage properties using pore network models combined with X-ray computed tomography (CT). The simulation results show that in a uniform wetting system, increasing the contact angle reduces the wettability of hydrate-bearing porous media, increases the relative permeability of the water phase, and decreases the relative permeability of the gas phase at a given water saturation. In addition, increasing the diameter of quartz sand particles notably enhances these changes in the gas-water phase relative permeability. In a fractional-wetting system, increasing the fractional wettability and connectivity effectively reduces the residual gas saturation. Moreover, the capillary pressure distributions are highly dependent on the fractional wettability and quartz sand size. (C) 2015 Elsevier B.V. All rights reserved.
机译：含水合物多孔介质的渗透性是预测水合物开采过程中流体流动行为，流体分布和气体性能的最重要因素之一。多孔介质的润湿性极大地影响了两相气水混合物的相对渗透率。在本文中，我们使用孔隙网络模型与X射线计算机断层扫描（CT）相结合，将先前的研究扩展到含水合物的多孔介质的润湿性对其渗透性能的影响。仿真结果表明，在均匀的润湿系统中，增加接触角会降低含水合物的多孔介质的润湿性，增加水相的相对渗透率，并降低给定水饱和度下气相的相对渗透率。另外，增加石英砂颗粒的直径显着增强了气相-水相相对渗透率的这些变化。在分数润湿系统中，提高分数润湿性和连通性可有效降低残留气体饱和度。此外，毛细管压力分布高度依赖于分数润湿性和石英砂尺寸。 （C）2015 Elsevier B.V.保留所有权利。

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