Influence study of pipes with many small holes on gas drainage by bedding boreholes

doi:10.16265/j.cnki.issn1003-3033.2019.07.015

Abstract

Abstract: For the sake of exploring the degree of influence of pipes with many small holes on the gas drainage by bedding boreholes, a gas-solid coupling model of coal seam was established on the basis of the fracture-pore dual media and gas drainage numerical simulation of pipes with many small holes in different layouts along coal seam was carried out. Besides, field experiment was conducted in the 11-2 coal seam of Pansan Coal Mine, and the actual gas drainage effects of cases having or not pipes with small holes in the boreholes was compared and analyzed. The results show that the application of pipes with many holes leads to the lowest residual gas pressure and content around the borehole, with the significant decrease of gas content around the borehole, the influence of pipes with small holes on gas drainage will be further enhanced with the increase of extraction time.

Key words: drilling borehole down seam, numerical simulation, field experiments, gas drainage, pipes with many small holes

CLC Number:

X936

TANG Mingyun, ZHENG Pengxian, DAI Guanglong, YAO Guanlin, DUAN Sanzhuang. Influence study of pipes with many small holes on gas drainage by bedding boreholes[J]. China Safety Science Journal, 2019, 29(7): 90-96.

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