The effect of tool joint stiffness on drill pipe fatigue in riser ball joints.

A. Ertas, W. R. Blackstone, B. K. Majumdar

Research output: Contribution to journalArticlepeer-review

Abstract

The ball joint in a marine riser can cause fatigue damage in the drill pipe passing through. Previous investigators have assessed the damage done for a lower ball joint angle of 3DEGREES to 5DEGREES (drilling) and 1DEGREES to 3DEGREES (running casing). This paper extends the work to deep water operations in which an upper ball joint is also presented. It is shown, via finite element models, that tool joint bending stiffness has a significant effect on fatigue life. Fatigue damage calculations are presented for various ball joint angles and drill pipe tensions.

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