PRINCIPLES OF VIBRATION IMPACT ON CRACKED METHANEBEARING COAL SEAM

Abstract eng:
The present article deals with the results of research into vibration impacts on a low-permeable coal seam. A method is described of how to create additional systems of cracks for array degassing to ensure its safe preparation. The result of vibration impact of on the coal seam was an increase in internal surface and pore volume of coal. Experimental vibration impacts on the coal seams have shown an increase in its absorption capacity, which ensured the extra impregnation of micro-pore volume of working fluid. With resonance system, the amplitude of the pressure fluctuations may significantly exceed its static value; for its assessment, however, it is necessary to know the characteristics of fluid viscosity, as they will determine the value of this amplitude. A proposed method of vibration impact is used to excite waves in a well filled with fluid, to transfer energy to the coal seam and to create new systems of formation of additional cracks for methane release from remote parts of coal seam.

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