Pull the 1 inch Manila rope inside the derrick and feed and reeve through the first crown sheave.

把一寸的棕绳穿过天车上的第一个滑轮，在井架内拉该棕绳。

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The formulas used for checking the integral stability of derrick and the method and criterion of analysing the problems arc also presented here.

文章对井架总体稳定校核所用的计算公式及分析问题的方法和准则也作了介绍。

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Equipped with suitable derrick and well controlled device in drilling a shallow gas well water drills proved to be able to reduce shallow gas well drilling cost.

通过某浅层气井的施工实例，阐述了水井钻机安装合适的钻塔底座和并控装置，可降低浅层气井建井成本。

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As you remember, we had a situation a few weeks ago where lighting struck the derrick and caused a fire.

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What they do is they sign a lease, and then a company comes along eventually and sets up a well and a derrick, and then they drill the well themselves.

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