地浸采铀开窗式切割钻孔施工技术

Construction technology of window cutting drilling for leaching uranium mining

填砾式钻孔结构(一次成井工艺)作为砂岩型地浸采铀工艺钻孔的主要钻孔结构,在国内多个铀矿区进行了应用,但在应用过程中过滤器易堵塞损坏、所需洗井时间长、钻孔使用寿命短等问题也逐渐凸显出来。本文对填砾式结构钻孔存在的问题进行分析,针对问题产生的原因,从钻孔结构、注浆技术、含矿含水层切割技术、内置过滤器安装、逆向投砾等方面进行施工工艺革新,形成了新型开窗式切割钻孔施工工艺。在新疆某铀矿床进行了规模应用,效果良好,较好地解决了填砾式钻孔施工工艺存在的问题。

As the main drilling structure for sandstone type in‑situ leaching uranium mining,the gravel filling structure drilling(one‑time well completion process)has been applied in multiple uranium mining areas in China.However,during the application process,problems such as easy blockage and damage of filters,long flushing time required,and short service life of drilling have gradually become prominent.This article analyzes the problems existing in gravel filling structure drilling,and focuses on the reasons for the problems,including the drilling structure.The construction process innovation has been carried out in areas such as grouting technology,mining and aquifer cutting technology,installation of built‑in filters,and reverse gravel casting,forming a new type of window cutting and drilling construction technology.In the past two years,the new window cutting drilling construction technology has been applied on a large scale in a uranium deposit in Xinjiang,and the application effect is good,effectively solving the problems existing in the gravel filling drilling construction technology.