含水煤岩渗透率演化规律及动态滑脱效应的作用机制

doi:10.13722/j.cnki.jrme.2021.0531

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摘要为探究含水煤岩在有效应力与动态滑脱效应综合作用下的渗透率演化规律，采用含瓦斯煤热–流–固三轴伺服渗流装置，分别测量不同含水率下有效应力增大过程中的煤岩渗透率。在此基础上，建立考虑有效应力、水分与动态滑脱效应综合作用的煤岩渗透率模型，并进一步量化分析不同有效应力和含水率下的煤岩渗流特性和动态滑脱效应及其相互间的联动机制。研究结果表明：(1) 含水率恒定时，有效应力增大过程中，煤岩渗透率呈指数形式减小。有效应力恒定时，含水率越大，煤岩渗透率越小。(2) 构建随有效应力、含水率变化的动态滑脱因子模型。在各含水率条件下，随有效应力增大，煤岩裂隙通道逐渐闭合，滑脱因子则呈增大趋势。此外，本试验条件下，同一有效应力下的滑脱因子在含水率1.80%以内缓慢增大，超过1.80%后出现激增。(3) 构建含水煤岩渗透率模型并验证其可靠性，量化滑脱效应对渗透率的贡献情况。(4) 考虑到实际储层中裂缝形态的差异，提出考虑不同裂缝形态的煤岩气测渗透率模型。其中，圆形裂缝对应的煤岩渗透率最小，方形次之，正三角形最大。探讨多因素综合作用下煤层气在储层中的运移规律，以期对提高煤层气采收率具有重要指导意义。

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	段淑蕾1
	李波波1
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	李建华1
	高政1
	成巧耘1
	许江4

关键词 ：岩石力学, 煤岩, 含水率, 滑脱效应, 渗透率模型, 有效应力

Abstract：In order to explore the evolution of permeability of coal with different water contents under the combined effect of effective stress and dynamic slippage，a gas-containing coal thermal-fluid-solid triaxial servo seepage device was used to measure the permeability of coal in the effective stress rise process under different water contents. A coal permeability model was established considering the effective stress，the water content and the dynamic slippage effect. The seepage characteristics and dynamic slippage effects of coal were further analyzed under different effective stresses and water contents. The research results show that，when the water content is a constant，the coal permeability decreases exponentially with increasing the effective stress，and that，when the effective stress is a constant，the greater the water content，the lower the coal permeability. A dynamic slippage factor model considering the changes of the effective stress and the water content is established. Under the conditions of various water contents，the coal fissure channels are gradually closed with increasing the effective stress and, at the same time，the slippage factor shows an increasing trend. In addition，under the same effective stress，the slippage factor increases with the water content，specifically，a slow increase while the water content less than 1.80% and then a sharp rise. A permeability model of water-bearing coal was constructed and its reliability was verified. The contribution of the slippage effect to the permeability was further quantified. A permeability model of coal considering the difference of fracture shapes in actual reservoirs was proposed. The permeability characteristics of coal under dry conditions were studied. The permeability of coal with circular fractures is the smallest，followed by square fractures and equilateral triangle fractures. The research on the migration law of coalbed methane in reservoir under the comprehensive action of multiple factors is helpful for improving the recovery of coalbed methane.

Key words： rock mechanics coal water content slippage effect permeability model effective stress

引用本文:

段淑蕾1，李波波1，2，3，李建华1，高政1，成巧耘1，许江4. 含水煤岩渗透率演化规律及动态滑脱效应的作用机制[J]. 岩石力学与工程学报, 2022, 41(4): 798-808.
DUAN Shulei1，LI Bobo1，2，3，LI Jianhua1，GAO Zheng1，CHENG Qiaoyun1，XU Jiang4. Permeability evolution of water-bearing coal considering dynamic slippage effect. , 2022, 41(4): 798-808.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2021.0531 或 http://rockmech.whrsm.ac.cn/CN/Y2022/V41/I4/798

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