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鹤岗煤田的上侏罗统南岭砾岩层,由于厚度大,砾径大小不等,胶结坚硬,给钻探施工带来了一定的困难。据乌山汪26个上千米深的普查孔统计,孔斜符合甲、乙级标准的钻孔有6个,其中最小倾角为14.3°,最大倾角为19°。而由于孔斜超限,未能穿过砾岩层的却有7个,其中孔斜最严重的82-3-5孔,孔深600m,倾斜角竟达51.3°。其余钻
The Upper Jurassic Nanling conglomerate layer in Hegang coalfield, due to its large thickness and uneven gravel size, is cemented hard and poses some difficulties for drilling construction. According to the statistics of 26 census holes on the Wangshan Mountain in Wangshan, there are 6 borehole holes meeting Grade A and Grade B standards, of which the minimum inclination angle is 14.3 ° and the maximum inclination angle is 19 °. However, due to the overrun of the hole, there are 7 holes which can not penetrate the conglomerate layer, of which the hole is the most serious hole 82-3-5, the hole depth is 600m and the angle of inclination is 51.3 °. The rest of the drill