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INDUSTRY SAFETY AND LABOUR PROTECTION
ArticleName Pulsed method of coalbed methane drainage
DOI 10.17580/gzh.2018.05.12
ArticleAuthor Kupavykh K. S., Shipulin A. V.
ArticleAuthorData

Saint-Petersburg Mining University, Saint-Petersburg, Russia:

K. S. Kupavykh, Assistant, Candidate of Engineering Sciences, Kupavykh_KS@pers.spmi.ru

 

RENES, Saint-Petersburg, Russia:

A. V. Shipulin, Chief Executive Officer, Candidate of Engineering Sciences

Abstract

An urgent problem of underground coal mining is high potential coalbed methane hazard. It is proposed to use the method of hydrodynamic treatment of coal based on the pulsed wave effect generated via holes. Since methane is distributed nonuniformly in low-permeable coal, the processes including percussion and vibration effects makes it possible to even pressure in the whole volume of a coal bed and to create favorable conditions for high-rate coalbed methane drainage. Hydraulic impact results in intense fracturing in a coal bed, and different size coal fragments fill the drilled holes. As a consequence, the treated hole becomes highly permeable, which promotes subsequent drainage of coal. The proposed method of coal bed treatment was tested experimentally in full-scale conditions of Kirov’s Mine in Kuzbass. Before and after hydraulic impact, methane concentration was measured in the check and neighbor holes. Additionally, aiming to reveal features of gas behavior in edge coal, miners took check measurements of methane concentrations in the treated and untreated neighbor holes per shift within a day after the experiment. As a result of the experimental hydraulic pulsed treatment of coal, it was observed that methane concentration first sharply grew in the test holes and then dropped to the values close to zero within a day. This is an evidence of efficiency of the hydrodynamic treatment technology in coalbed methane drainage.

keywords Gas draining, hydrodynamic treatment, coal bed, hole, methane, impulse wave, system of joints
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