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某矿区是我局铁矿普查会战的重点.矿区西部大面积为第四纪地层所覆盖,上为70～160米中细砂及中细砂夹碎石层,下为20～48米砂卵石展,底部基岩风化壳漏水.基岩可钻性多为8～9级,部分10级以上.平均孔深400～500米,少数钻孔深达800～1000米.无论是采用钢粒钻进还是小口径金刚石钻进的各个队,均用套管护孔.但起下套管问题一直没能很好解决,既耽误生产,又丢失管材.我局第九地质队三分队六○一机台自进入矿区施工以来,针对所施工的矿区覆
A mining area is the focal point of the iron mine census of our bureau.Mining area in the west is covered by Quaternary strata, with 70-160 meters of fine sand and medium-sized sand and sand crushed stone layers, and 20-48 meters of sand and gravel Show, the bottom of the bedrock weathered leaking water bedrock drillability mostly 8 to 9, some 10 above the average hole depth of 400 to 500 meters, a few drilling depth of 800 to 1000 meters. Whether it is the use of steel drill Into the small-diameter diamond or into the various teams are using casing retaining holes, but from the casing has not been able to solve the problem, not only delay the production, but also lost the pipe. Our Bureau of the geological team third one six one one Since the construction of the machine into the mine, for the construction of the mine cover