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我队在龙下老煤矿打钻时,钻孔常穿过老窿,结果冲洗液全部漏失,钻具因无井壁扶持而偏离原方向,甚至发生断钻事故等.其治理办法应根据当时的具体条件来选定.如果窿道离地面较浅(如仅几十米),可由孔口下套管至孔底,进行全孔隔离;如果窿道离地面一、二百米或更深,通常可下入常规的暗管.但是这种暗管存在以下弊病: 1.需要换径钻进.由于受孔深条件及其他因素的限制,钻进中途换径很不方便. 2.暗管顶端是裸露的,下钻时极易碰坏钻头.
When the team drilled the old coal mine in Longxia Mine, the drilling hole often crossed the old hole, resulting in the loss of all the flushing fluid. The drilling tool deviated from the original direction due to the lack of well-wall support and even the broken-down accident occurred. Of the specific conditions to choose.If the roadway from the ground shallower (such as only tens of meters), from the mouth of the casing to the bottom of the hole, full hole isolation; if the roadway to the ground one or two hundred meters or deeper, Usually can be put into a conventional tube, but the tube has the following disadvantages: 1. Need to change the diameter of the drilling due to hole depth conditions and other factors, it is inconvenient to change the drilling halfway. The top is bare, easy to touch drill when drilling.