Study on new technology of " two plugging, one injection and one discharge "

doi:10.16265/j.cnki.issn1003-3033.2018.08.017

Abstract

Abstract: For the sake of increasing the extraction concentration of gas extraction drilling and achieving gas recovery and utilization of coal mine,the paper was aimed at improving the existing process of "one-piece bladder double plugging and one injection" plugging process.A new type of "two plugging,one injection and one discharge" was sealing device designed and made.Laboratory researches and downhole engineering experiments were conducted to compare and analyze the effects of the two types of plugging devices.The results show that the grouting section of the "two plugging,one injection and one discharge" new process in the in-hole experiment is dense,but there is an obvious blank section in the" integrated pouch double plugging and single injection",that under the same coal seam condition,the average gas volume fraction is 75% in 90 days with the new process of "two plugging,one injection and one discharge",but the volume fraction is 55% with the existing process.

Key words: two plugging, one injection and one discharge, gas extraction, grouting hole sealing, integrated pouch double plugging and single injection, extraction effects

CLC Number:

X936

QI Qingjie, ZHAO Youxin, LYU Youchang, JIA Xinlei, ZHOU Xinhua. Study on new technology of " two plugging, one injection and one discharge "[J]. China Safety Science Journal, 2018, 28(8): 100-104.

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