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&lt;/script&gt;</html><description>Oil casing is an important equipment for oil drilling, and its main equipment includes drill pipe, core pipe and casing, drill collar and small diameter steel pipe for drilling. The domestic casing is made of geological drilling steel by hot rolling or cold drawing, and the steel number is &#x201C;geological&#x201D; (DZ), and the common casing [&hellip;]</description></oembed>
