...钻进效率;钻孔质量;连续帷幕 [gap=588]Hydropower Station; drilling direction; causes of hole deviation; hole accident; drilling efficiency; drilling quality; continuous curtain ..
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影响冲击钻“钻进效率”的几点因素分析-毕业论文提纲范文 关键词】 .冲击钻；钻进效率；施工工艺. [gap=440]Key words】.Pound at to drill;Drill into the efficiency;Construction craft
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最佳钻进效率 optimum drilling efficiency
因此，钻进效率低，回次进尺短，孔斜不易控制。
实践证明，PD C钻头使用寿命长，在提高钻进效率的同时经济效益显著。
PDC bit has long service life, which can improve drilling efficiency with obvious economical benefit.
在钻井施工过程中，为了提高钻进效率，降低成本，对PD C钻头进行选型研究是必要的。
In order to increase drilling efficiency and reduce cost during drilling operations, it is necessary to do some research on PDC bit selection.
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