An Improved Gas Permeability Evolution Model of Coal Containing Gas with Klinkenberg Effect

被引：8

作者：

Liu J. ^{[1
,2
,3
,4
]}

Wang K. ^{[3
]}

Wang L. ^{[3
]}

Zhou A. ^{[3
]}

机构：

[1] School of Safety Engineering, Heilongjiang University of Science and Technology, Harbin

[2] State and Local Joint Engineering Laboratory for Gas Drainage and Ground Control of Deep Mines, Henan Polytechnic University, Jiaozuo

[3] School of Resources and Safety Engineering, China University of Mining and Technology, Beijing

[4] Hunan Key Lab of Coal Safety Mining Technology, Hunan University of Science and Technology, Xiangtan

来源：

Geotechnical and Geological Engineering | 2017年 / 35卷 / 01期

基金：

中国国家自然科学基金;

关键词：

Gas seepage; Klinkenberg effect; Low permeability; Pore pressure;

D O I：

10.1007/s10706-016-0118-3

中图分类号：

学科分类号：

摘要：

Most of coal fields in China have low permeability, which is a key parameter to reflect the possibility of gas migration in coal seams, coal and gas outburst. Permeability is also a important factor for expectation and mine of coal-bed methane. Low permeability coal seams have significant Klinkenberg effect, and that with decreasing permeability of coal the Klinkenberg effect increases. However, most of previous permeability models do not consider Klinkenberg effect. It is known that when mean free path of gas molecules is close to the pore size of porous materials Klinkenberg effect appears, which is the essence of Klinkenberg effect. In this study, we build relationships between mean free path of gas molecules and Klinkenberg factor b. By using the relationships and the formula of effective permeability and absolute permeability, we establish a gas permeability evolution model of coal containing gas with Klinkenberg effect. Then we make a compare between our permeability model and other permeability models, such as Levine model, P-M model, S-D model, and the results show that the model considering Klinkenberg effect best accords with the experimental data under condition of fixed confining stress. We think that model considering Klinkenberg effect has important significance for expectation and mine coal-bed methane when it comes to low permeability coal seams. © 2016, Springer International Publishing Switzerland.

引用

页码：433 / 443

页数：10

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