Fatigue testing of drill pipe

Journal Article · Wed Jun 01 00:00:00 EDT 1994 · SPE Drilling and Completion (Society of Petroleum Engineers); (United States)

DOI:https://doi.org/10.2118/24224-PA· OSTI ID:7038169

Grondin, G Y; Kulak, G L

Twenty-nine tests in air and 27 tests in a 3.5% NaCl solution were conducted to test the fatigue strength of Grade E 4.5-in.-OD, 16.6-lbm/ft (114-mm-OD, 24.7-kg/m) drillpipe. The effects of stress range, mean stress, corrosion, and upset geometry were tested on the drillpipe body alone and on specimens that included the tool joint, upset, and drillpipe body. Stress range and mean stress effects were significant in noncorrosive and corrosive environments. The effect of upset geometry was minimal on an external upset compared with that on an internal/external upset. Among the specimens that failed, grinding marks on the drillpipe surface, which occurred during inspection at the mill, caused failure of about 60% of the specimens. Grinding created a notch effect and induced a detrimental residual-stress pattern on the pipe surface, which decreased drillpipe fatigue life. API guidelines for cumulative fatigue of Range 2 drillpipe were evaluated in light of these experimental test results and were found to be unsafe for drilling in noncorrosive conditions and possibly too conservative for corrosive conditions.

• OSTI ID: 7038169
• Journal Information: SPE Drilling and Completion (Society of Petroleum Engineers); (United States), Vol. 9:2; ISSN 1064-6671
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
02 PETROLEUM
03 NATURAL GAS
DRILL PIPES
FATIGUE
MATERIALS TESTING
STRESS CORROSION
WELL DRILLING
CHEMICAL REACTIONS
CORROSION
DRILLING
DRILLING EQUIPMENT
EQUIPMENT
MECHANICAL PROPERTIES
PIPES
TESTING
422000* - Engineering- Mining & Underground Engineering- (1980-)
420500 - Engineering- Materials Testing
020300 - Petroleum- Drilling & Production
030300 - Natural Gas- Drilling
Production
& Processing