INFLUENCE OF DRILLSHIP ROLL ON THE DRILLPIPE FATIGUE UNDER VARIABLE AMPLITUDE LOADING

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RASHEDI GH.R.; GHAJAR R.A.; HASHEMI SEYED JALAL ALDIN

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Journal Paper

Paper Information

Journal: JOURNAL OF MARINE ENGINEERING Year:2007 | Volume:3 | Issue:5 Page(s): 1-22

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Title

INFLUENCE OF DRILLSHIP ROLL ON THE DRILLPIPE FATIGUE UNDER VARIABLE AMPLITUDE LOADING

Author(s)

RASHEDI GH.R. | GHAJAR R.A. | HASHEMI SEYED JALAL ALDIN | Issue Writer Certificate

Keywords

MULTIAXIAL FATIGUEQ4

VARIABLE AMPLITUDE LOADINGQ4

DRILL PIPEQ4

DRILLSHIPQ4

ROLL ANGLEQ4

Abstract

During the offshore drilling operations by DRILLSHIPs or semisubmersible vessels the drillstring in its first drilljoint to the Kelly suffers bending due to float vessel roll or pitch. The cyclic bending stress at any point along the drillstring, is a function of the roll or pitch angle, Kelly position in bushing, and hookload. The cumulative fatigue damage of the drillpipe due to cyclic stresses near the drillpipe connection to Kelly has been calculated in this paper. The effects of the cyclic stress amplitude variation are also taken into account.Then five MULTIAXIAL FATIGUE models are evaluated under VARIABLE AMPLITUDE LOADING (similar to drillpipe loading) conditions. Comparing the results of the five models predictions by the muliaxial fatigue tests experimental data under variable amplitude axial-torsional loading, show that the combined critical plane and energy models predict the fatigue life better than the others. It works much better for VARIABLE AMPLITUDE LOADING than the existing models.

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References

ANALYSIS AND DETERMINATION OF THE PRINCIPAL FACTOR FOR THE ABNORMAL DRILL-STRING FAILURES IN GACHSARAN AND BIBIHAKIMEH OIL FIELDS OF IRAN

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APA: Copy

RASHEDI, GH.R., GHAJAR, R.A., & HASHEMI, SEYED JALAL ALDIN. (2007). INFLUENCE OF DRILLSHIP ROLL ON THE DRILLPIPE FATIGUE UNDER VARIABLE AMPLITUDE LOADING. JOURNAL OF MARINE ENGINEERING, 3(5), 1-22. SID. https://sid.ir/paper/60863/en

Vancouver: Copy

RASHEDI GH.R., GHAJAR R.A., HASHEMI SEYED JALAL ALDIN. INFLUENCE OF DRILLSHIP ROLL ON THE DRILLPIPE FATIGUE UNDER VARIABLE AMPLITUDE LOADING. JOURNAL OF MARINE ENGINEERING[Internet]. 2007;3(5):1-22. Available from: https://sid.ir/paper/60863/en

IEEE: Copy

GH.R. RASHEDI, R.A. GHAJAR, and SEYED JALAL ALDIN HASHEMI, “INFLUENCE OF DRILLSHIP ROLL ON THE DRILLPIPE FATIGUE UNDER VARIABLE AMPLITUDE LOADING,” JOURNAL OF MARINE ENGINEERING, vol. 3, no. 5, pp. 1–22, 2007, [Online]. Available: https://sid.ir/paper/60863/en

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