煤矿大口径瓦斯抽放孔下管工艺实践  

Practice of large diameter gas drainage hole in coal mine

作　　者：赵福森[1] Zhao Fusen(The second hydrogeological team of China Coal Geology Administration,Xingtai,054000,China)

机构地区：[1]中国煤炭地质总局第二水文地质队,河北邢台054000

出　　处：《煤炭与化工》2021年第12期93-97,共5页Coal and Chemical Industry

摘　　要：煤矿大口径瓦斯抽放孔套管的下放,成为施工过程中最关键的工序。为了利用小型钻塔代替重型吊车的下管工艺,总结一套安全、经济、高效的煤矿大口径瓦斯抽放孔重型套管下放工艺。以河南省许昌新龙矿业梁北矿瓦斯直排井施工为例,基于“掏空浮力法”原理对下管过程中各个环节及数据分析研究。结果表明,“掏空浮力法”的使用在荷载90 t的钻塔下放246 t套管过程是可行的,且安全系数能够达到2.0。节约吊车租赁费42.5万元、工期7 d,从安全、工期、费用方面均优于重型吊车的下管工艺。The lowering of large diameter gas drainage hole casing in coal mine has become the most critical process in the construction process.In order to use the small drilling tower to replace the heavy crane pipe laying process,a set of safe,economic and efficient heavy casing laying process for large-diameter gas drainage holes in coal mines is summarized.Taking the construction of gas direct drainage well in Liangbei Mine of Xuchang Xinlong Mining Industry in Henan Province as an example,based on the principle of'tunneling buoyancy method',the various links and data analysis in the process of pipe down are studied.The results show that the use of'tunneling buoyancy method'is feasible in the process of placing 246 t casing under 90 t drilling tower,and the safety factor can reach 2.0.Saving crane rental cost 4.25 million yuan,construction period 7 d,whether from the safety,construction period,cost are better than heavy crane pipe process.

关 键 词：大口径瓦斯抽放孔 掏空浮力法 强度校核 套管连接 固井工艺 

分 类 号：TD712[矿业工程—矿井通风与安全]