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Drill Collar

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Keywords: Drill Collar
Brief: Drill collars are manufactured from AISI 4145H modified steel, and are supplied in the "as rolled" surface finish condition. Alternative surface finis...

提升短节

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Lifting Sub

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Keywords: Lifting Sub
Brief: Lifting sub is the drilling tools used for connect the drill collar without shoulder, finishing the drip up and drip in process with the slips.
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