Research on key technologies for systematic control of gas in coal seam having low permeability and high outburst risk

doi:10.16265/j.cnki.issn1003-3033.2018.07.018

Abstract

Abstract: Gas control is especially crucial in low-permeability and high-explosive coal seams.In order to improve mine safety as well as mining efficiency,based on comprehensive considering the speciality and difficulty of low-permeability and high-explosive coal seams,this paper proposes a systematic governance concept involving 8 key technologies:N₂ foam fracturing reservoir reconstruction,directional pin-shaped multi-branch horizontal well mining,butt well hydraulic migration and pressure relief mining,strip-type well up and down linkage pressure relief mining,regional progressive well up and down linkage extraction,well up and down linkage pumping mining system optimization,pressure relief zone gas drainage,and downhole drilling-cutting-pressure-flushing-injection integration.The research shows that systematic gas control is an effective way to ensure the safe mining of low-permeability and high-explosive coal seams,and that comprehensive considering the characteristics of a given coal mine production activity,predictive making plans for different stages and connecting them orderly are the key to the successful implementation of systematic gas control.

Key words: low permeability and high outburst, gas, systematic governance mode, pressure relief and permeability enhancement, combined action of underground and surface, hydraulic integrated process

CLC Number:

X936

FU Jiangwei, FU Xuehai, LIU Qi, JIN Xiaohua, CHEN Liang. Research on key technologies for systematic control of gas in coal seam having low permeability and high outburst risk[J]. China Safety Science Journal, 2018, 28(7): 109-115.

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