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Heat treatment of drill collars

โœ Scribed by A. M. Prishlyak; V. G. Vabishchevich; V. N. Kozyrev; B. P. Fedyk; Z. S. Kuz'myak; A. A. Kmet'; B. P. Nadezhkin


Publisher
Springer
Year
1989
Tongue
English
Weight
236 KB
Volume
24
Category
Article
ISSN
1573-885X

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Fatigue life improvement of drill collar
โœ M.J. Knight; F.P. Brennan ๐Ÿ“‚ Article ๐Ÿ“… 1999 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 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