金沙江其宗水电站水平孔钻进技术

Study on Drilling Technology for Horizontal Hole in Qizong Hydropower Station of Jinsha River

其宗水电站属峡谷区修建的高坝水库。ZK119水平孔设计孔深350 m,位于上坝址左岸地下厂房。水平孔与垂直孔相比,施工技术难度大,安全隐患大,对钻杆、设备要求更高。水平孔施工重点是水平成孔,因此,控制孔斜率是关键。以ZK119水平孔为例,从水平孔施工技术原理、技术特点和防斜措施等方面论述水平孔钻进技术,旨在为更深水平孔施工提供借鉴。

Qizong hydropower station was built in a high dam reservoir of canyon area,and the biggest dam was preliminarily planned to be as high as about 358m.The designed hole depth of ZK119 was 350m and located in the underground plant of left bank of upper damsite.Compared to the vertical borehole,the horizontal hole is more difficult in construction technology with higher hidden danger and higher requirements of drill pipe and drilling equipment.The construction point of horizontal excavation is hole deviation control,and taking the example of horizontal hole ZK119,the paper elaborated the horizontal hole drilling technology in the principles of horizontal drilling technology,technical features and the measures of deviation control.