After the water quenching of the drill pipe steel grade, the cooling method of drill pipe welds is changed to the quick water cooling instead of the previous high-pressure air cooling.

钻杆钢种水淬化后，焊缝热处理的冷却方式由以前的高压空气冷却转变为快速水冷却。

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Compared with the prior art, the utility model has the advantage of automatic shutdown of the drill bit after the bone is pierced by the drill bit.

本实用新型与已有技术相比，具有钻头钻穿骨头后自动停止钻动的优点。

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Indeed, after all the various attendant service needed to drill a well are summed up, there could be as many as a hundred service and supply companies working at the drill site at one time or another.

实际上，累计钻一口井所需要的服务，在一个钻井场地同时或不同时有一百多家服务或供应公司工作。

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The 4, 200 passengers and crew on board had not conducted an emergency drill after leaving on its cruise several hours earlier.

BBC: Costa Concordia cruise ship captain 'went off course'

For instance, passengers on the Costa Concordia had not completed a lifeboat safety drill, because ships have 24 hours after setting sail to hold the drill.

BBC: What is the safest mode of travel?

And the main way they do it is through what they call hydraulic fracturing, which after they drill the well bore, they perforate it.

NPR: Drilling for Gas in Dallas-Fort Worth