煤矿安全2025，Vol.56Issue(2)：212-219,8.DOI:10.13347/j.cnki.mkaq.20240415
煤矿井下定向长钻孔套管下放方法及固孔工艺
Casing running and solidifying bore by grouting in directional long borehole in coal mine
摘要
Abstract
To solve the current problem that it is difficult to realize the whole process of running the thick diameter casing and solidi-fying bore by grouting in the hydraulic fracturing of directional long boreholes in underground coal mines,we analyzed the technical difficulties of casing running and solidifying bore by grouting and the corresponding countermeasures were presented.The overall technical scheme of casing running and solidifying bore by grouting in directional long borehole was constructed,the salvable meth-od of casing running and grouting technology through annular space were proposed;the maximum curvature 0.285°/m of the bore-hole was given by the analysis of casing possibility;the salvable reaming drilling tools,torsion transmission mechanism,spiral cent-ralizer and casing thread type were designed;the grouting technique and cement slurry system which was applicable to upward direc-tional long borehole were developed.The salvable method of casing running and grouting technology through annular space in direc-tional long borehole has been applied to Caojiatan Mine,and application results showed that the technical system is feasible,and the casing with a diameter of ϕ127 mm was drilled to a depth of more than 500 m in a directional long borehole in a coal mine for the first time,and full hole section grouting is realized in directional long holes with hole depth of more than 500 m.关键词
定向长钻孔/水力压裂/可打捞式底扩钻具/套管下放/注浆固孔Key words
directional long borehole/hydraulic fracturing/salvable reaming drilling tools/casing running/solidifying bore by grouting分类
矿业与冶金引用本文复制引用
冯彦军,侯红,任建超,刘茂福,孙立强..煤矿井下定向长钻孔套管下放方法及固孔工艺[J].煤矿安全,2025,56(2):212-219,8.基金项目
国家重点研发计划资助项目(2023YFC2907502) （2023YFC2907502）
