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在同一级岩石的钻进过程中,钻进速度是随着钻孔的延深而逐渐降低.其降低现象是当钻孔大约超过100公尺以上和岩石硬度达到7级以上时较为显著.现将我们在实际中测得的结果列于表1.
During the drilling process of the same grade of rock, the drilling speed gradually decreases with the deepening of the drilling depth, which is remarkable when the drilling depth exceeds about 100 meters and the rock hardness reaches level 7. Now The results we measured in practice are shown in Table 1.