The air-driven down-hole hammer drilling is still very effective and speedy in well drilling in karst limestone area.

在水文水井中，气动潜孔锤钻进仍可发挥它高效率、高速度的作用。

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May operate air-track, rotary, down-the-hole or other drilling machines to drill blast holes or may direct drilling of blast holes.

操作空气运作轨道，旋转，向下钻孔机或其他钻探机钻爆破洞或直接钻爆破洞。

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The main contents of this thesis are the research of simultaneous casing & coring method by pneumatic Down-the-Hole (DTH) hammer drilling and the innovation of a novel vegetable-gum drilling fluid.

本文是以中国水电顾问集团成都勘测设计研究院负责“架空层钻进取心技术研究”项目为依托，研究的主要内容是空气潜孔锤跟管取心钻进技术和新型植物胶冲洗液的开发研究。

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By reentering that hole and drilling down to 29, 000 feet, the partners found pay at depths that years ago nobody thought might contain oil or gas.

FORBES: Magazine Article

It now appears that as they redrill to get the drilling muds moving again and so forth, they may be pushing the fish down the hole in front of the bit.

FORBES: McMoRan Exploration Insists We "Stay Tuned"