Drill Collar

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Drill Collar
Posting date : Mar 18, 2010
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Free Member Scince Mar 18, 2010
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27-
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Detailed Description
Drill Collar is mainly used to provide bit weight to drill bit so that drill pipe is in tension. Especially drill collar can keep drill bit centralized and hole track by large rigidity. TIANHE brand drill collars are manufactured strictly from API Spec7-1 and SY5411 standard.

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