This is a reversal thinking operation concept against the pipe drilling method of casing pipe wall protection described in conventional books.

本方法与书本上所述的套管护壁跟管钻进方法有反向思维操作概念。

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The utility model relates to an auxiliary accessory used for production of a ductile pipe casing enterprise, in particular to a novel supporting wheel for supporting a cast pipe to rotate.

本实用新型涉及球墨铸管企业生产用的辅助配件，特别指一种支承铸管转动的新型托轮。

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Allen said that in preparation for the storm, crews had pulled the drill string out, put a plug known as a "packer" in the casing pipe and filled the riser with seawater so the pipe would be stable.

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