新型“两堵一注”封孔工艺在上向长距离穿层钻孔的应用研究  

A new“two-plug-one-grout”sealing technology for long distance upward cross-layer drilling

作　　者：何文杰 谢雄刚[1] 刘志飞 HE Wenjie;XIE Xionggang;LIU Zhifei(School of Mining,Guizhou University,Guiyang 550025,China)

机构地区：[1]贵州大学矿业学院,贵州贵阳550025

出　　处：《煤炭工程》2025年第2期75-81,共7页Coal Engineering

基　　金：国家自然科学基金地区基金资助项目(51864009,52164016);安徽理工大学煤炭无人化开采数智技术全国重点实验室资助项目(SKLMRDPC22KF19)。

摘　　要：为了解决在上向长距离穿层钻孔封孔时,封孔材料会因自身重力而很难增大密封长度,及浆液很难向上向长距离穿层钻孔上侧渗透的问题。采用新型“两堵一注”封孔工艺来解决。通过采用80 mm直径钢管模拟钻孔,应用速凝膨胀封孔材料封孔的实验获知:速凝膨胀封孔材料充满了整个封孔段空间和囊袋,浆液紧实。对贵州省仲恒煤矿12集中巷20^(#)煤层底板瓦斯抽放巷的现场试验研究可知:新型“两堵一注”封孔工艺受钻孔倾角变化的影响小,其平均瓦斯抽放浓度始终在60%以上,而“两堵一注”封孔工艺的平均瓦斯抽放浓度始终随着钻孔倾角的增大而减小,其最大的平均瓦斯抽放浓度也不过36.3%;新型“两堵一注”封孔工艺的平均瓦斯抽放浓度衰减速率小于0.02,而“两堵一注”封孔工艺的平均瓦斯抽放浓度衰减速率大于0.2。结果表明新型“两堵一注”封孔工艺比“两堵一注”封孔工艺更适合上向长距离穿层钻孔。In order to solve the problem that the sealing material for long-distance layer drilling upwards will squeeze out the front end plug of the drilling due to its own gravity and it is difficult to penetrate the upper side of the long-distance layer drilling upwards,a new“two-plug-one-grout”sealing technology was adopted.Through simulation experiments using 80 mm diameter steel pipes to simulate drilling,it was found that the material of the sealing section filled the entire sealing space,and the slurry at the front end of the bag was tight.The on-site experimental study on the gas drainage roadway of the 20^(#)coal seam floor in the 12 centralized roadway of Zhongheng Coal Mine in Guizhou Province shows that the new“two-plug-one-grout”sealing technology is less affected by changes in drilling angle,and its average gas drainage concentration is always above 60%.However,the average gas drainage concentration of the original sealing technology always decreases with the increase of drilling angle,and its maximum average gas drainage concentration is only 36.3%;The average gas drainage concentration attenuation rate of the new“two-plug-one-grout”sealing technology is less than 0.02,while that of the original technology is greater than 0.2.The results indicate that the new sealing technology is more suitable for long distance upward cross-layer drilling than the original one.

关 键 词：上向长距离穿层钻孔 新型“两堵一注” 密封长度 钻孔倾角 平均瓦斯抽放浓度 

分 类 号：TD712[矿业工程—矿井通风与安全]