煤层瓦斯渗流过程中压力分布的滑脱效应
发布时间：2019-07-19 10:45
【摘要】：气体在多孔介质中渗流时,不仅需克服启动压力梯度,而且受气体滑脱效应的影响。基于煤层瓦斯的渗流特性,建立考虑滑脱效应的煤层瓦斯渗流模型,并对煤层瓦斯渗流过程的压力分布进行数值模拟。计算结果表明,在一定煤层深度内,与不考虑滑脱效应时煤层瓦斯压力分布相比,考虑滑脱效应对其影响显著,且随着暴露时间增长和距煤壁距离增大,其差别更为明显。滑脱因子的变化将直接影响煤层内部气体压力的分布,随着滑脱因子的增大,气体压力减小,滑脱越明显。与不考虑滑脱效应(Darcy解)瓦斯压力分布相比,考虑滑脱效应时煤层瓦斯压力分布曲线更接近实测数据,表明在研究煤层渗流过程中须考虑滑脱效应。
[Abstract]:When the gas permeates in porous media, it is not only necessary to overcome the starting pressure gradient, but also affected by the gas slippage effect. Based on the seepage characteristics of coal seam gas, a coal seam gas seepage model considering slippage effect is established, and the pressure distribution of coal seam gas seepage process is numerically simulated. The calculation results show that in a certain coal seam depth, compared with the coal seam gas pressure distribution without considering the slippage effect, considering the slippage effect has a significant effect on it, and the difference is more obvious with the increase of exposure time and the distance from the coal wall. The change of slippage factor will directly affect the distribution of gas pressure in coal seam. With the increase of slippage factor, the gas pressure decreases, and the slippage becomes more and more obvious. Compared with the gas pressure distribution without considering the slippage effect (Darcy solution), the coal seam gas pressure distribution curve considering the slippage effect is closer to the measured data, which indicates that the slippage effect should be considered in the study of coal seam seepage.
【作者单位】： 河南理工大学安全科学与工程学院;河南理工大学土木工程学院;
【基金】：国家自然科学基金项目(51274090) 中国博士后科学基金项目(2013M531673) 河南省科技攻关计划项目(142102310268) 河南省高等学校深部矿井建设重点学科开放实验室开放研究基金项目(2013KF-01)
【分类号】：TD712
[Abstract]:When the gas permeates in porous media, it is not only necessary to overcome the starting pressure gradient, but also affected by the gas slippage effect. Based on the seepage characteristics of coal seam gas, a coal seam gas seepage model considering slippage effect is established, and the pressure distribution of coal seam gas seepage process is numerically simulated. The calculation results show that in a certain coal seam depth, compared with the coal seam gas pressure distribution without considering the slippage effect, considering the slippage effect has a significant effect on it, and the difference is more obvious with the increase of exposure time and the distance from the coal wall. The change of slippage factor will directly affect the distribution of gas pressure in coal seam. With the increase of slippage factor, the gas pressure decreases, and the slippage becomes more and more obvious. Compared with the gas pressure distribution without considering the slippage effect (Darcy solution), the coal seam gas pressure distribution curve considering the slippage effect is closer to the measured data, which indicates that the slippage effect should be considered in the study of coal seam seepage.
【作者单位】： 河南理工大学安全科学与工程学院;河南理工大学土木工程学院;
【基金】：国家自然科学基金项目(51274090) 中国博士后科学基金项目(2013M531673) 河南省科技攻关计划项目(142102310268) 河南省高等学校深部矿井建设重点学科开放实验室开放研究基金项目(2013KF-01)
【分类号】：TD712
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