考虑孔弹性效应的煤岩微纳米孔隙瓦斯表观渗透率模型及其在瓦斯抽采中的应用

doi:10.13722/j.cnki.jrme.2023.0527

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摘要煤岩微纳米孔隙中孔弹性效应对其产气量具有重要影响，而目前微纳米孔隙中渗透率模型很少考虑此因素。为了探究煤岩微纳米孔隙中孔弹性效应对气体流动机制的影响，基于微纳米孔隙中孔弹性效应与多种机制流动模型，构建一种考虑孔径动态变化的瓦斯表观渗透率模型，并分析动态表观渗透率模型的主控流动机制与微纳米孔隙中滑脱效应对瓦斯开采产量的贡献程度。研究结果表明：孔弹性效应通过影响孔径演化，改变滑脱效应、表面扩散效应对表观渗透率的贡献程度。随着孔隙压力增大，动态表观渗透率比值依次受到气体滑脱效应、孔弹性效应主控，滑脱效应对表观渗透率比值(孔弹性效应影响的表观渗透率与初始表观渗透率的比值)的贡献程度在低压时随着孔隙压力增大迅速下降，在高压时缓慢下降。深部低渗透率煤层瓦斯开采过程中，滑脱效应对瓦斯开采产量的贡献程度分别呈现初期时快速增大，中期时缓慢下降及后期时缓慢增加的趋势。微纳米孔隙平均孔径越低时，滑脱效应对瓦斯开采产量贡献程度越大。

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	李伟1
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	杨康3
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	邓东1
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	王海锋1
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关键词 ：采矿工程, 瓦斯表观渗透率, 孔弹性效应, 滑脱效应, 微纳米孔隙, 瓦斯抽采

Abstract：The poroelastic effect in micro/nano-pores of coal significantly affects gas production. However，it is currently rare for the poroelastic effect to be considered in gas apparent permeability model for micro/nano-pores. In order to investigate the influence of the poroelastic effect on gas flow mechanisms in micro/nano-pores，a gas apparent permeability model considering the dynamic evolution of pore size is constructed based on the poroelastic effect and multiple mechanism flow model in micro/nano-pores. The dominant flow mechanism of the dynamic apparent permeability model is determined and the contribution of slippage effect in micro/nano-pores to gas recovery production is evaluated. The results show that the poroelastic effect impacts the contribution of the slippage and the surface diffusion effects to the apparent permeability by influencing the evolution of pore size. As the pore pressure increases，the dynamic apparent permeability ratio(the ratio of the apparent permeability affected by the poroelastic effect to the initial apparent permeability) is controlled by the slippage effect and the poroelastic effect in turn. Additionally，the contribution of the slippage effect to the apparent permeability ratio decreases rapidly at lower pressure but decreases more gradually at higher pressure as the pressure increases. In the process of gas recovery from low-permeability coal seams，the contribution of the slippage effect to gas recovery production initially increases rapidly，then decreases gradually，and eventually reaches a slow increase. A smaller average pore size in micro/nano-pores leads to a greater contribution of the slippage effect to gas recovery production.

Key words： mining engineering gas apparent permeability poroelastic effect slippage effect micro/nano-pores gas extraction

引用本文:

李伟1，2，杨康3，4，邓东1，2，王海锋1，2. 考虑孔弹性效应的煤岩微纳米孔隙瓦斯表观渗透率模型及其在瓦斯抽采中的应用[J]. 岩石力学与工程学报, 2024, 43(3): 587-599.
LI Wei1，2，YANG Kang3，4，DENG Dong1，2，WANG Haifeng1，2. A gas apparent permeability model in coal micro/nano-pores considering the poroelastic effect and its application in gas extraction. , 2024, 43(3): 587-599.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2023.0527 或 http://rockmech.whrsm.ac.cn/CN/Y2024/V43/I3/587

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