Analyzing the effects of inhomogeneity on the permeability of porous media containing methane hydrates through pore network models combined with CT observation
Analyzing the effects of inhomogeneity on the permeability of porous media containing methane hydrates through pore network models combined with CT observation
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通过孔隙网络模型结合CT观测分析非均匀性对含甲烷水合物多孔介质渗透率的影响
DOI：
10.1016/j.energy.2018.08.100
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发表时间：
2018-11
期刊：
影响因子：
9
通讯作者：
Li Yanghui
中科院分区：
文献类型：
--
作者：
Yang Lei;Ai Li;Xue Kaihua;Ling Zheng;Li Yanghui
在天然气水合物资源开采过程中，含水合物多孔介质的渗透率对于预测流体的流动行为和天然气产能具有重要意义。天然气水合物在天然气样品中分布不均匀，水合物的不均匀性对天然气水合物的渗透性有很大影响。因此，在这里，我们扩展了我们的研究非均质含水合物多孔介质的渗透率与X射线计算机断层扫描（CT）相结合的孔隙网络模型。讨论了不同孔喉半径、水合物分布不均匀和流体流动方向对绝对渗透率和相对渗透率的影响。结果表明，较高的含水饱和度对天然气的渗透性影响较大，不利于天然气的开采。即使在相似的孔隙度下，孔隙和喉道的微观结构也可能不同;一些孔隙可能没有足够的喉道连接到它们，限制了流体流动。绝对渗透率也可能随着流动方向而显著变化;有利于气体流动的方向可能不适用于水流。这一发现可能有助于在现场试验中更需要优先产气而不是产水的情况下。
The permeability of porous media containing gas hydrates is of crucial importance in predicting the fluid flow behavior and gas production capacity during the exploitation of gas hydrate resource. Gas hydrates are generally unevenly distributed in the natural samples, the inhomogeneity of which could have significant impacts on the permeability properties. So here we extend our study on the permeability of heterogeneous hydrate-bearing porous media using pore network models combined with X-ray computed tomography (CT). The effects of varying pore/throat radii, non-even distribution of hydrates and fluid flow directions on the absolute and relative permeability are discussed. It is indicated that the rather high water saturation would significantly impact the gas permeation, which is not favorable for gas production. The microstructures of pores and throats would likely differ even under similar porosities; some pores may not have sufficient throats connected to them, limiting the fluid flow. The absolute permeability could also significantly vary with flow directions; the direction favorable for gas flow may not be true for water flow. This finding can be of help in case a preferential gas production is more required rather than water in the field test.
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影响因子：
3.2
作者：
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DOI：
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作者：
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发表时间：
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影响因子：
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作者：
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影响因子：
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