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近年来,我队在火成岩和较硬砂岩分布区的两个深孔中,进行了96毫米孔径针状合金钻头钻进试验,取得了效果。目前已有两种钻头在我队普遍推广。现将试验情况简介如下: 一、试验区岩层概况试验区(本溪大峪勘探区)石炭二迭纪煤系厚200多米,大部分覆盖着5～7级(个别达8级)流纹质安山岩(厚300～400米,最厚达700多米)。中生代小东沟砾岩及煤系中二
In recent years, our team has carried out 96 mm diameter needle-shaped alloy drill bit drilling test in two deep holes in igneous and hard sandstone distribution areas, and achieved the result. There are currently two types of drill bits commonly used in my team. The experimental conditions are briefly described as follows: I. Rock Formation Profile in the Experimental Area The Benxi-Dayu exploration area is over 200 meters thick with most of coal measures covering 5 ~ 7 grades (up to 8 grades each) (300 ~ 400 meters thick, the thickest of more than 700 meters). Second generation of Xiaodonggou conglomerate and coal series in Mesozoic