文献类型：期刊文献

英文题名：Influence of coal deformation on the Knudsen number of gas flow in coal seams

作者：Zhou, Yinbo[1,2];Li, Hansheng[1];Huang, Jilei[3];Zhang, Ruilin[1];Wang, Shijie[1];Hong, Yidu[4];Yang, Yongliang[5]

第一作者：Zhou, Yinbo

通讯作者：Zhou, YB[1];Zhou, YB[2]

机构：[1]Henan Univ Engn, Sch Resources & Safety Engn, Zhengzhou 451191, Peoples R China;[2]Henan Polytech Univ, State Key Lab Cultivat Base Gas Geol & Gas Contro, Jiaozuo 454150, Henan, Peoples R China;[3]Henan Univ Econ & Law, Coll Resources & Environm, Zhengzhou 450046, Peoples R China;[4]Fuzhou Univ, Coll Environm & Resources, Fuzhou 350000, Peoples R China;[5]China Univ Min & Technol, Sch Safety Engn, Xuzhou 221116, Jiangsu, Peoples R China

第一机构：Henan Univ Engn, Sch Resources & Safety Engn, Zhengzhou 451191, Peoples R China

通讯机构：[1]corresponding author), Henan Univ Engn, Sch Resources & Safety Engn, Zhengzhou 451191, Peoples R China;[2]corresponding author), Henan Polytech Univ, State Key Lab Cultivat Base Gas Geol & Gas Contro, Jiaozuo 454150, Henan, Peoples R China.

年份：2021

卷号：233

外文期刊名：ENERGY

收录：;EI(收录号：20212510518428);Scopus(收录号：2-s2.0-85107909357);WOS:【SCI-EXPANDED(收录号:WOS:000681286800009)】；

基金：The authors are grateful to the National Natural Science Foundation of China (NO. 51804098, 51974301), Key Scientific Research Project of Colleges and Universities in Henan Province (NO. 19A440001, 20A420001). Supported by the State Key Laboratory Cultivation Base for Gas Geology and Gas Control (Henan Polytechnic University), (NO. WS2019B07).

语种：英文

外文关键词：Knudsen number; Coal deformation; Permeability; Klinkenberg effect; CBM recovery

摘要：The effective stress and pore pressure can change the fracture aperture, which in turn can change the methane Knudsen number and transitions between gas flow regimes. A novel Knudsen number (Kn) model for gas flow under coal deformation was established; a revised permeability model was formu-lated and used to obtain an equation for the Klinkenberg coefficient b. The predictions of the revised permeability model were in good agreement with experimental data, and the parameters used to determine the gas Kn were obtained. An increase in the pore pressure under coal deformation causes the fracture aperture to increase and the gas molecular mean free path to decrease, thereby decreasing the Kn. Thus, the critical pore pressure for the transition between gas flow regimes is reduced. The gas Kn for a deformed fracture is higher than that for a constant fracture aperture. The critical fracture aperture for the transition between gas flow regimes increases under coal deformation. The Klinkenberg coefficient b for methane is a variation value that increases as Kn decreases. The Kn variation is very important for determining the coal permeability and which can be used to resolve problems in CBM recovery. (c) 2021 Elsevier Ltd. All rights reserved.