Drilling practice show that formation and bit types are tow important factors effected drilling.

钻井实践表明，地层因素和钻头类型是影响钻井过程的两个十分重要的因素。

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Pendulum assembly is a kind of BHA for hole straightening, which is applied widely in drilling practice.

钟摆钻具是一种常用的纠斜钻具组合，在钻井中应用极为广泛。

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Pendulum assembly is a kind of BHA for hole straightening, which is applied widely in drilling practice.

倒装钟摆钻具组合是一种新型的直井防斜钻具组合，在小井斜角高钻压下表现出了较好的防斜特性。

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The Cuomo administration has put off a decision on the drilling practice of high-volume hydraulic fracturing, also known as hydrofracking, as it awaits the results of a health-department review, and its uncertainty over the matter appears to reflect statewide sentiment.

WSJ: Backing For Cuomo Declines Upstate

In a statement to the BBC, Exxon Mobil said that before drilling offshore "it is standard industry practice to conduct extensive studies at and below the seabed" to check for hazards, using tools including remote sonar and a magnetometer.

BBC: Russia explores old nuclear waste dumps in Arctic