Abstract

Internal solitary waves(ISW) often generates large horizontal velocity when it spreads, and exerts great impact and shearing force on drilling risers, which would be more dangerous if current, surface waves(SW) and ISW coexist. This paper develops a quasi-static calculating procedure to evaluate the extreme influence of these three hydraulic loads exerting together on a drilling riser. Comparative analysis indicates that the maximal response of a riser emerges when the phase angles of SW and ISW are 12° and 0° respectively; around ISW trough, bending moment changes suddenly in a step-like jump, while shearing force increases sharply in a peak state.

Keywords:
hydraulic load, von mise stress, equation, sea level, cylindrical pile, maximal von mise stress, seawater, drilling riser, mise stress, isw amp
Subjects:
Pipelines, Flowlines and Risers, Risers
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2015. International Society of Offshore and Polar Engineers
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