Fatigue life improvement of drill collar
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M.J. Knight; F.P. Brennan
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Article
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1999
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Elsevier Science
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English
โ 703 KB
The majority of drillstem failures are attributed to fatigue\ particularly in BHA connections where there is a high level of stress concentration in the thread roots[ Any stress concentration combined with a modest amount of bore eccentricity in the drill collar may result in a notable reduction in