Fatigue life improvement of threaded connections by cold rolling

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

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)83-93
Number of pages11
JournalJournal of Strain Analysis for Engineering Design
Issue number2
Publication statusPublished - 1 Feb 2005


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


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