瓦斯抽采钻孔漏气类型划分与高效封孔技术应用研究

周厚权,申凯,陈宾．瓦斯抽采钻孔漏气类型划分与高效封孔技术应用研究[J ]．矿业安全与环保,2019,4６（1）:33－3６．文章编号:1008－449５（2019）01－0033－04

应用技术

周厚权1,2,申凯1,2,陈宾1,2

(1．瓦斯灾害监控与应急技术国家重点实验室,重庆40003７;2．中煤科工集团重庆研究院有限公司,重庆40003７)

摘要:通过对钻孔漏气及封孔机理的分析,指出瓦斯抽采钻孔主要存在a 二ｂ和c 共3种类型的漏气点,其中c 类即煤体复合裂隙为当前抽采钻孔主要的漏气类型三为提高肥田煤矿1６号煤层的瓦斯预抽效果,在111６1运输平巷开展了高效封孔提质技术的试验三通过对已封钻孔内甲烷体积分数轴向分布规律的实测,分析其钻孔主要存在c 类漏气,确定试验点合理封孔深度为1５m ,并开展封孔对比试验考察三在约７0d 的考察期内,试验钻孔在同一抽采时期的平均抽采甲烷体积分数比聚氨酯封孔工艺的抽采甲烷体积分数提高30%~40%,且未出现明显的衰减现象,表明高效封孔提质技术可有效解决抽采钻孔c 类漏气问题,具有较好的工程应用价值三

关键词:瓦斯抽采;钻孔;漏气类型;封孔工艺;封孔深度;抽采效果

中图分类号:ＴＤ７12+．６文献标志码:Ａ

收稿日期:201７－11－19;2019－01－02修订

基金项目: 十三五国家科技重大专项

（201６ZX0５0６７004－004）;企业科技创新创业资金专项

（2018QＮ00５）

作者简介:周厚权（19７8 ）,男,重庆忠县人,副研究员,

主要从事煤矿瓦斯灾害治理及煤层气开发方面的研究工作三

E－mail :ZHQMKY 11@1６3．com 三Research on Leakage Types and Efficient Sealing Technology for Gas Drainage Borehole

ZHOU Houquan 1,2,SHEN Kai 1,2,CHEN Bin 1,2（1.State Key Laboratory of the Gas Disaster Detecting ,Preventing and Emergency Controlling ,Chongqing 400037,China ;https://www.360docs.net/doc/7c1130705.html,TEG Chongqing Research Institute ,Chongqing 400037,China ）

Abstract :Ｔｈrougｈanalyｚing tｈe mecｈanism of ｂoreｈole leakage and sealing,it was pointed out tｈat tｈere were mainly 3types （type a,type ｂand type c）of gas leakage points in gas drainage ｂoreｈole．Ａmong tｈem,type c,namely coal composite fracture,was tｈe main type of gas leakage in current drainage ｂoreｈoles．In order to improve tｈe pre－drainage effect of gas in Ｎo．1６coal seam of Feitian Ｃoal Mine,tｈe experiment of efficient ｂoreｈole sealing and quality improvement tecｈnology was carried out in 111６1transport roadway．Based on tｈe measurement of tｈe axial distriｂution law of metｈane volume fraction in tｈe sealed ｂoreｈole,it was analyｚed tｈat tｈere was mainly type c gas leakage in tｈe ｂoreｈole,and tｈe reasonaｂle sealing deptｈof tｈe test site was determined to ｂe 1５m,and tｈe comparative test of ｂoreｈole sealing were carried out．Ｄuring tｈe inspection period of aｂout ７0days,compared witｈtｈe polyuretｈane sealing process in tｈe same drainage period,tｈe average volume fraction of metｈane extracted from tｈe test ｂoreｈole increased,tｈe range for increasing was from 30%to 40%,and no oｂvious attenuation occurred．Ｔｈe results sｈow tｈat tｈe efficient sealing tecｈnology can effectively overcome tｈe type c leakage in

drainage ｂoreｈoles and ｈas excellent engineering application value．Keywords :gas extraction;ｂoreｈole;leakage type;sealing tecｈnique;sealing deptｈ;extraction effect

钻孔抽采瓦斯是高瓦斯及煤与瓦斯突出煤矿井下治理瓦斯灾害的主要措施之一三由于瓦斯抽采系统采用负压抽采,外界空气在负压的作用下易进入钻孔,从而稀释抽采系统内的瓦斯浓度[1]三抽采瓦斯浓度偏低,一方面会导致瓦斯利用难度加大或利用成本增高,大部分抽出的瓦斯被直接排放到大气

四

33四第4６卷第1期2019年2月矿业安全与环保Mining Safety &Environmental Ｐrotection Vol．4６Ｎo．1Feｂ．2019

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