It is difficult to calculate the penetration rate of percussion drilling.
钻井机械钻速预测是难题。
The penetration rate by air dust drilling in the hard and dry formation can reach16.
空气粉尘钻井在干硬地层机械钻速达到16。
Correct use of rate of penetration will give many aids to mud logging and well drilling.
正确应用钻时，能够给录井和钻井施工提供很多帮助。
Drilling rig is easy to be destroyed at low rate of penetration with long drilling circle.
机械钻速低，钻井周期长，钻具易损坏。
Research on Single Cycle Drilling Rate during Ezcavation in Tunnel with Smalll Cross section
小断面隧洞开挖单循环进尺试验研究
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