基于钻孔漏气位置检测的二次注浆堵漏提浓技术研究  

Research on the technique of secondary grouting to plugging leakage based on drilling air leakage location detection

作　　者：周建伟 高保彬[2] 张永斌 陈立伟[2] 李阳[3] ZHOU Jianwei;GAO Baobin;ZHANG Yongbin;CHEN Liwei;LI Yang(Gas Control Research Center,Shanxi Lu’an Yuwu Coal Industry Co.,Ltd.,Changzhi 046000,China;School of Safety Science and Engineering,Henan Polytechnic University,Jiaozuo 454000,China;China Coal Research Institute,Beijing 100013,China)

机构地区：[1]山西潞安余吾煤业有限公司瓦斯治理研究中心,山西长治046000 [2]河南理工大学安全科学与工程学院,河南焦作454000 [3]煤炭科学研究总院,北京100013

出　　处：《矿业安全与环保》2021年第5期54-58,共5页Mining Safety & Environmental Protection

基　　金：“十三五”国家科技重大专项(2016ZX05067006-001)。

摘　　要：为了提升瓦斯抽采钻孔密封效果,研发了钻孔漏气位置检测与孔内二次注浆堵漏装置,并在余吾煤业本煤层掘进预抽钻孔进行试验研究,在检测钻孔漏气位置的基础上明确了合理的孔内注浆深度,然后对孔内进行二次注浆堵漏,并对二次注浆堵漏钻孔的瓦斯浓度(甲烷体积分数,下同)变化情况进行了分析。结果表明:抽采钻孔中漏气位置对瓦斯浓度影响较大,瓦斯浓度由钻孔底部至孔口呈现出下降的趋势,瓦斯浓度越小,表明漏气越严重;在距孔口16~17 m位置漏气最为严重,距孔口18~19 m位置漏气相对减少,综合考虑将孔内二次注浆深度定为16~19 m;孔内二次注浆堵漏试验钻孔中瓦斯浓度在30%以上的钻孔占58.8%,抽采瓦斯浓度达到15%~30%的钻孔占23.5%,表明孔内二次注浆堵漏技术能够有效提高钻孔抽采瓦斯浓度。In order to improve the sealing effect of extraction drillings,a device was developed to detect the leak location of the drilling and plug the hole with secondary grouting.The application test was carried out for the coal seam pre-drilling in Yuwu Coal Mine.On the basis of detecting the leak location of drilling,the reasonable grouting depth in drilling was defined.Then the drilling was plugged with secondary grouting,and the variation of gas concentration(methane volume fraction)in the plugging drilling of secondary grouting was analyzed.The results show that the gas leak location in the extraction drilling has a great influence on the gas concentration,the gas concentration shows a decreasing trend from the bottom of the drilling to the orifice,and the smaller the gas concentration is,the more serious the gas leakage is;the air leakage is the most serious at the location 16 m to 17 m away from the orifice,while the air leakage is relatively reduced at the location 18 m to 19 m away from the orifice.Considering comprehensively,the depth of secondary grouting in the drilling is set as 16 m to 19 m;the drilling with gas concentration above 30%in the second grouting to plug the gas leakage account for 58.8%,and those with extraction concentration reaching 15%to 30%account for 23.5%,indicating that the technology of the second grouting to plug the gas leakage can effectively improve the gas extraction concentration of the drilling.

关 键 词：瓦斯抽采 钻孔密封 抽采失效 漏气检测 二次注浆 堵漏 

分 类 号：TD712.6[矿业工程—矿井通风与安全]