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Spiral drill collar  Jul. 16, 2009 0:56:43

Spiral drill collar Spiral drill collars are manufactured three spiral groves on slick drill collar, which is used reduce contact area to avoid efficiently bit sticking form differential pressure.....

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  • drill collar  Jul. 16, 2009 0:52:01

    Drill collar Drill collars are made of 4145H modified Cr Mo alloy steel, which are manufactured according to API Spec 7 and SY/ T 5144 standard. We can supply all kinds of connections for our drill....

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