Experimental study on influence of gas pressure on permeability and slippage effect of gas hydrate bearing coal

被引：0
|
作者：
Zhang B. [1 ]
Zhao G. [1 ]
Gao X. [2 ]
Wu Q. [1 ]
Zhang X. [3 ]
机构：
[1] School of Safety Engineering, Heilongjiang University of Science and Technology, Heilongjiang, Harbin
[2] School of Architecture and Civil Engineering, Heilongjiang University of Science and Technology, Heilongjiang, Harbin
[3] Institute of Mechanics, Chinese Academy of Sciences, Beijing
来源：
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | 2023年 / 42卷 / 11期
基金：
中国国家自然科学基金;
关键词：
coal and gas outburst; gas hydrate bearing coal; gas pressure; mining engineering; permeability; slippage effect;
D O I：
10.13722/j.cnki.jrme.2023.0011
中图分类号：
学科分类号：
摘要：
To evaluate impacts of gas pressure on permeability and slippage effect of gas hydrate bearing coal，the permeability was measured for gas hydrate bearing coal under different gas hydrate saturations，particle sizes and gas pressures，by using triaxial testing machine for coupling action of stress，seepage and chemical effect. Then，the relationship between the gas hydrate saturation and the slippage effect was quantified by combining with the secondary permeability correction equation. Furthermore，the slippage effect was quantitatively evaluated on the permeability. The results show that：(1) The permeability of gas hydrate bearing coal exponentially decreases with the increase of the gas pressure with a reduction between 14.6% and 66.4%，and the permeability variation can be divided into two stages，including accelerated decrease stage and stable variation stage. (2) The permeability change rate Bp and the gas pressure sensitivity coefficient Cp are introduced to evaluate the sensitivity of the permeability of gas hydrate bearing coal to the gas pressure. The permeability change rate Bp and the gas pressure sensitivity coefficient Cp respectively increase and decrease rapidly with the increase of the gas pressure，if the gas pressure is less than 1.50 or 1.625 MPa，indicating that the sensitivity of the gas pressure is significant. (3) The hydrate saturation has significant influence on the slippage effect and the slippage factor decreases with the increase of the hydrate saturation. (4) The influence rate of the slippage effect on the permeability of the gas hydrate bearing coal ranges from 30.1% to 98.2%，and the influence rate of the slippage effect exponentially decreases with the increase of the gas pressure. The results can provide experimental reference for hydrate method application in coal and gas outburst prevention. © 2023 Academia Sinica. All rights reserved.
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页码：2655 / 2667
页数：12
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