煤矿安全2019，Vol.50Issue(5)：1-6,6.DOI:10.13347/j.Cnki.Mkaq.2019.05.001
滑脱系数动态变化对煤层气运移的影响
Influence of Dynamic Change of Slippage Coefficient on CBM Migration
摘要
Abstract
In the seepage of low permeability coal seam, the slippage effect is obviously affected by the seepage effect. In the current CBM seepage model, the slippage coefficient is regarded as a constant. Based on this, a gas seepage model with dynamic slip coefficient is established, and the finite element numerical software is used for simulation analysis. The variation law of permeability and slippage coefficient of coal reservoir with extraction time is studied after considering dynamic slippage effect. The difference of pore pressure in coal reservoir is compared when dynamic slip coefficient and fixed initial slip coefficient are considered. The results show that the slip coefficient increases first and then decreases, and the permeability decreases first and then increases with the increase of extraction time. When the dynamic slippage effect is taken into account, the reduction of pore pressure at all places of the coal reservoir after 30 d of extraction is smaller than that without consideration, and the difference between the two is larger with the lower initial permeability.关键词
煤层气/动态滑脱系数/孔隙压力/渗流模型/数值模拟Key words
coalbed methane/dynamic slip factor/pore pressure/seepage model/numerical simulation分类
矿业与冶金引用本文复制引用
李立功,康天合..滑脱系数动态变化对煤层气运移的影响[J].煤矿安全,2019,50(5):1-6,6.基金项目
:"十三五"国家科技重大专项资助项目(2016ZX05067004-003) （2016ZX05067004-003）
中国煤炭科工集团有限公司科技创新基金资助项目(2018QN010) （2018QN010）
