And all those give as well a reference to offshore derrick design.

此方法也可供海洋井架电算参考。

youdao

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。

youdao

It might be as well to consult Magnus and Mrs. Derrick.

还是找曼克奈斯和台力克太太去商量吧。

youdao

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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