The testing of gas drainage efficiency about feather-veined 1 000 m length-drillhole
WANG Zhao-feng
TIAN Fu-chao
ZHAO Bin
CHEN Xiang-jun
YU Bao-zhong
Abstract：Studied the areal gas drainage characteristics and advantage of feather-veined 1 000 m longitudinal lengthdrillhole, combined with coal seam gas drainage principle, analyzed the relationship between drillhole gas flow and neg-ative pressure, length of drillhole, pointed out that 1 000 m length-drillhole was a new technology which applied to areal prevention of gas outburst and underground coalbed methane drainage in gassy mine. As the technology applied to Nos. 1 and 2,1 000 m length-drillhole which in the west gathering main roadway of Sihe Coal Mine, Shanxi Jincheng Anthracite Coal Mining Group Co. Ltd. , the effect indicates that the areal gas drainage from virgin coal seam rate can reach more than 42%, under the relative invariant condition of gas permeability coefficient and drainage negative pressure,the longer the drillhole is,the more the drillhole gas flux per 100 meters and the smaller the attenuation coefficient, so the gas drainage efficiency will increase in identical time.
Keywords：1 000 m length-drillholepressure relief circlenegative pressuregas drainage efficiency
Publication Date：2010-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：4( 76-79 )