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| EXPERIMENTAL RESEARCH ON SEEPAGE LAGGING EFFECTS OF COALBED METHANE RESERVOIR UNDER CONDITION OF TRIAXIAL STRESS |
| XU Jiang1，2，ZHOU Ting1，2，LI Bobo1，2，ZHANG Dandan1，2，LIU Dong1，2 |
(1. State Key Laboratory of Coal Mine Disaster Dynamics and Control，Chongqing University，Chongqing 400044，China；
2. State and Local Joint Engineering Laboratory of Methane Drainage in Complex Coal Gas Seam，Chongqing University，
Chongqing 400044，China) |
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Abstract By using the triaxial servo-controlled seepage equipment for thermo-fluid-solid coupling of coal containing methane，permeability under conditions of different confining pressures and temperatures were determined. Studying the migration law of coalbed methane and taking appropriate measures to coalbed methane can prevent coal and gas outburst，or reasonably use the methane in the coalbed methane reservoir. It is of practical significance for mine construction and coalbed methane mining. The experimental results show that：(1) Under different experimental conditions，the change of seepage velocity lags behind the change of strain and stress of coal under triaxial compression；and the lagging amount of the minimum volumetric strain is large. (2) The lagging amount of the minimum volumetric strain and the peak stress both decrease with the increase of temperature. (3) The confining pressure hinders the gas seepage through the changes of internal structure caused by compression effect of confining pressure；and the lagging of the minimum volume increases with the increase of confining pressure.
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Received: 01 March 2012
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LI Botao1, 2, 3, TAN Yuxuan1, LIN Haifei4, 5*, WEI Jianping1, 2, 3, ZHANG Hongtu1, 2, 3, LI Shugang4, 5, WEI Zongyong4, 5, WANG Pei4, LUO Rongwei4, LIU Yanwei1, 2, 3. Mechanical properties and mesoscopic damage evolution of coal under liquid-nitrogen freezing at different initial temperatures[J]. , 2026, 45(6): 1757-1772. |
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2012, Vol. 31 
