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我队勘探地层为二迭纪岩层,在钻探上必须钻过厚120米左右的长兴石灰岩层,才能达到钻入煤系层的目的。长兴灰岩较硬,硬度在7～8级,致密多裂隙,岩层倾角大,并大部份合有燧石结核。在钻至该层时,如采用一般合金钻头钻进,效率很低,且合金易崩落,影响钻进,有时还能造成孔内故障;采用钻粒钻进,由于该层破碎多裂隙,大部分不返水,故小时尅取效率同样不高?由夏壳案髯昕拙詹榭?尚不能采用全面不取心钻进。总之,这层是我队钻探上的一关,严重的影响了地质勘探任务的全面提前完成。为此,我队成功的创用了“对齿镶式”合金钻头,经使
My team explored the formation for the Permian rock formation, drilling must be drilled about 120 meters thick Changxing limestone layer, in order to achieve the purpose of drilling into the coal seam layer. Changxing limestone harder, hardness 7 to 8, dense and more cracks, rock dip angle, and most of the chert flocculation. When drilling into this layer, if using common alloy drill to drill, the efficiency is very low, and the alloy is easy to collapse, affecting the drilling, and sometimes can cause hole failure; using drilling, due to the layer broken more cracks, large Part of the water does not return, so the same efficiency is not high grams of grams by the summer shell 髯 Xin Zhuozha Zhan Xin? Still can not use a comprehensive non-motivated drilling. In short, this layer is one of my team drilling on a serious impact on the geological exploration mission completed in advance. To this end, my team successfully created a “toothed inlay” alloy drill, after the passage