三轴应力条件下煤层气储层渗流滞后效应试验研究

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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.

Key words： mining engineering triaxial compression seepage lagging quantity

Received: 01 March 2012

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http://www.rockmech.org/EN/Y2012/V31/I9/1854

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