... 平视显示 head-up display 钻头进尺 headway per drill bit 脑力劳动；拱顶石饰；渠头控水建筑物 headwork ...
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本文提出了一种按最低成本原则确定单只钻头进尺的实用方法。
A method is proposed to determine the bit footage when the drilling cost per meter reaches a minimum.
通过取心工具和钻头的优选、参数优化以及技术措施的强化，该井取心进尺18。
Through optimization of coring tools and bits and improving technical measures, the coring footage of the well is 18.
现场试验同样证实设计的自振空化射流喷嘴在保护钻头、减少钻头磨损及增加进尺、提高机械钻速方面有显著作用。
Field tests also show that the self-resonating cavitation nozzle is highly effective in reducing bit wear, increasing drilling footage and drilling speed.
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