Further Test on Crossing Hydraulic Fracturing Technology for K1 Coal Seam in Tonghua Mine
DONG Guofu
HUANG Song
DENG Yongliang
HU Yun
Abstract：Further test was carried out on the hydraulic fracturing technology across K1 coal seam in ± 0 m level entry in Tonghua Mine, investigation was made on the change of the basic parameters of the coal seam before and after hydraulic fracturing by arranging the inspection holes in the setting range and using DGC gas content rapid measuring instrument and pressure gauges, the influence scope of hydraulic fracturing and the change law of gas migration inspection were determined, the arrangement of drainage holes was optimized, and the gas drainage effect after hydraulic fracturing was examined. As compared with the permeability enhancement of 2125-3 haulage way by hydraulic cutting at the same conditions, the average pure gas drainage volume of a single drilling site increased from 0. 063 8 m3/min to 0. 253 8 m3/min after the permeability enhancement of the drivage strip of 3121 air-return way by high-pressure hydraulic fracturing, increased by 297. 81%;the average pure gas drainage volume of a single hole increased from 0. 001 7 m3/min to 0. 007 4 m3/min, increased by 335. 29%, so the permeability enhancement effect was good.
Keywords：gas drainagehydraulic fracturing of coal seambasic parameterspermeability enhancement effect
Publication Date：2015-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：4( 73-76 )