Effect of residual stress on ACFM crack measurements in drill collar threaded connections

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

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

The drill collar threaded connection of the type used in hydrocarbon exploration is a critical component of the drillstring that is highly susceptible to fatigue damage. In an attempt to reduce costly downhole failures the connections are cold rolled to introduce compressive residual stress, and when in service the connections are routinely inspected. The Alternating Current Field Measurement (ACFM) technique is an increasingly popular method of thread inspection, however, results have indicated that the ACFM defect sizing capability may be compromised when it is used to inspect recently cold rolled connections. If a connection is cold rolled without first being defect free, subsequent inspections may under estimate crack depth with the standard interpretation. Inspection before rolling is therefore necessary.

LanguageEnglish
Pages337-343
Number of pages7
JournalNDT and E International
Volume37
Issue number5
DOIs
Publication statusPublished - 1 Jul 2004

Fingerprint

Drill collars
residual stress
inspection
Residual stresses
alternating current
cracks
Inspection
Cracks
Defects
threads
sizing
defects
Fatigue damage
Hydrocarbons
Compressive stress
hydrocarbons
damage
estimates

Keywords

  • alternating current field measurement
  • crack sizing
  • residual stress
  • thread root cold rolling

Cite this

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Effect of residual stress on ACFM crack measurements in drill collar threaded connections. / Knight, M. J.; Brennan, F. P.; Dover, W. D.

In: NDT and E International, Vol. 37, No. 5, 01.07.2004, p. 337-343.

Research output: Contribution to journalArticle

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