Fatigue life improvement of threaded connections by cold rolling

M. J. Knight, F. P. Brennan, W. D. Dover

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Failures in drillstring threaded connections continue to afflict the oil industry at a cost of millions of dollars per year. In an attempt to reduce these failures the industry has generally adopted the fatigue-life-enhancing technique of cold rolling the threaded connections which act as stress concentrations. However, this beneficial process is only specified as optional in the industry standards, and where it is performed there is very little detail provided about this important process. This paper describes full-scale fatigue tests that investigate the cold-rolling process. From the development of cold-rolling equipment and the gathering of fatigue experimental data, several key factors have been identified that influence the operational lifetime of drillstring threaded connections.

LanguageEnglish
Pages83-93
Number of pages11
JournalJournal of Strain Analysis for Engineering Design
Volume40
Issue number2
DOIs
Publication statusPublished - 1 Feb 2005

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Cold Rolling
Cold rolling
Fatigue Life
Fatigue of materials
Industry
Fatigue
Stress Concentration
Stress concentration
Lifetime
Continue
Experimental Data
Costs

Keywords

  • drillstring threaded connection
  • fatigue life improvement
  • residual stress
  • thread-root cold rolling
  • threaded connections
  • cold rolling

Cite this

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Fatigue life improvement of threaded connections by cold rolling. / Knight, M. J.; Brennan, F. P.; Dover, W. D.

In: Journal of Strain Analysis for Engineering Design, Vol. 40, No. 2, 01.02.2005, p. 83-93.

Research output: Contribution to journalArticle

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