本文说明在钻进规范固定不变，钻头相同的条件下同一种岩层的钻进机械速度随钻孔加深而变化的特点和决定这些变化的原因。钻进机械速度随着钻孔深度加深而下降，最早是在打石油钻时发现的，因为石油钻孔比勘探钻孔深得多。C.B.加卢斯田〔2〕、B.C.菲多洛夫〔6、7〕和E.И.斯捷秋哈〔4〕研究了钻孔深度对钻进机械速度的影响。他们对钻进规范固定不变，钻头相同时所做的结 This paper shows the characteristics of drilling machine speed of the same strata changing with the deepening of the borehole under the same drilling conditions and the same drilling conditions and the reasons for these changes. Drilling machine speed decreases as drilling depth deepens, as early as during oil drilling, because oil drilling is much deeper than drilling. C.B. Gallustian [2], B. C. Fedorov [6, 7] and E. I. Szekethah [4] studied the effect of drilling depth on drilling machine speed. They made the same drill when the drilling specifications were the same