When underbalanced drilling or drilling easy leaky zone by using aeration fluid, the determination of fluid density and downhole fluid column pressure is very important.

利用气体型流体进行欠平衡钻井，或钻易漏地层时，流体密度及井下液柱压力的确定十分重要。

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Drilling fast, easy slag, the smaller the turning resistance.

清渣容易、回转阻力小、钻进速度快。

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The diamond drilling method discribed in this paper is easy to do and has a practical significance.

这种钻探技术，是一项简而易行，又十分有意义的技术工艺。

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The firm said the device would be easy to manufacture, does not require drilling or piling into the seabed and would have a minimum environmental impact.

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It is easy to see how the country could benefit from starting shale gas drilling as soon as possible.

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If they succeed in drilling here, working other Edens, like the Alaska National Wildlife Refuge, will be easy by comparison.

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