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目前在岩芯钻探施工中,下套管护壁仍然是主要手段之一.我队在某矿区施工,冰碛层相当厚,少者几十米,多者达500余米,用泥浆护壁钻穿此层后,还必须下套管.否则,在继续钻进时,经常掉出活石.前几年,打大口径钻孔,下φ108套管,由于钻孔较深,施工周期长,往往发生套管或套管接手从丝扣根部折断事故.例如506机施工的11号孔,下φ108套管381.56米,钻进到600多米时,套管先后折断六次.推广人造金刚石钻探技术后,钻孔口径较小,只能下φ73套管,套管接
Currently in the core drilling construction, casing under the casing is still one of the main means of my team in a mining construction, moraine layer is quite thick, the few tens of meters, more than 500 meters, with mud retaining wall drill Wear this layer, you must also under the casing, otherwise, continue to drill, often fall out of live rock.A few years ago, playing a large diameter drilling, under φ108 casing, due to deep drilling, construction period is long, Such as the construction of the No. 506 hole machine, under the φ108 casing 381.56 meters, drilling more than 600 meters, the casing has been broken six times. The promotion of synthetic diamond drilling technology After drilling a smaller diameter, only under the φ73 casing, casing connected