地面多分支水平井与煤矿井下钻孔连通技术探讨

Discussion on the Connectivity Technology between Horizontal Well and Underground Drilling in Coal Mine with Multiple Branches on Ground

地面多分支钻井与井下钻孔对接施工时,首先在煤矿井下向上扬适当角度钻进一个钻孔,然后在地面进行多分支水平井施工,先钻进分支,然后钻进主支,并通过连通仪器实现地面多分支水平井主支与井下钻孔对接,洗井后,下入筛管形成永久性的气体通道,实现煤层瓦斯预抽采。本文通过ZX煤矿ZX-1井井下对接实例,介绍了煤层瓦斯抽采井下对接设计及对接专用设备,分析了煤层瓦斯抽采井下对接关键技术及问题,提出解决方案,为煤矿瓦斯抽采多分支水平井井下对接技术提供宝贵经验。

When surface multi-branch drilling is connected with underground drilling,a drilling hole is first drilled at an appropriate upward angle in the underground coal mine,and then a multi-branch horizontal well is constructed on the ground.First,branches are drilled,then main branches are drilled,and through connecting instruments,the main branches of surface multi-branch horizontal wells are connected with underground drilling holes,and after washing wells,the main branches of underground multi-branch horizontal wells are drilled.The permanent gas pas?sage is formed by entering the sieve tube to realize the pre-extraction of coal seam gas.Through the example of ZX-1 underground docking in the ZX coal mine,this paper introduced the design and special equipment of underground docking in coal seam gas extraction,analyzed the key technologies and problems of underground docking in coal seam gas extraction,and put forward solutions to provide valuable experience for underground butt-joint technology of multi-branch horizontal wells in coal mine gas extraction.