It still is a difficult subject for most drilling engineers to predict and control well path by applying the mechanical analysis of bottom hole assembly and the rock-bit interaction model.

利用下部钻具力学分析和钻头与地层相互作用模型来预测和控制井眼轨道对于大多数钻井作业来说仍是一个难题。

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Most drilling in metal is done with a twist drill.

大多数金属钻孔用的是麻花钻头。

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The White House says it is preparing for the worst. Experts say the most effective solution involves drilling relief wells to reroute oil, a process that could take months.

VOA: standard.2010.05.31

At the bottom of the Knotty Head hole, the 450-degree-Fahrenheit temperature and the pressure (2, 000 times atmospheric) would crush or melt most drilling tools.

FORBES: Magazine Article

But Democratic leaders have opposed efforts to repeal a 1981 law barring most offshore drilling.

CNN: Lawmakers seek oil-drilling compromise

Democratic leaders had previously opposed Republican-led efforts to repeal a 1981 law barring most offshore drilling.

CNN: House OKs bill allowing more offshore oil drilling