文档介绍：2007 Petroleum Science VolA
Strength and Stability Analysis ofDeep Sea Drilling Risers
Yang Jin!, Liu Caihong', Liu Hanbirr', Xie Renjun' and Cao Shijing'
(1. Beijing Key Laboratory ofUrban Oil and Gas Distribution Technology, China University ofPetroleum, Beijing 102249, China)
(2. Institute ofOil and Gas Technology, Changqing Oilfield, CNPC, Xi'an, Shaanxi 710021, China)
(3. Key Laboratory ofDeepwater Engineering Technology, CNOOC Oil Field pany, Beijing 100027, China)
Abstract: In order to analyze the influence of vortex-induced vibration on the strength and stability of marine drilling
risers, a simplified analytical model was established and a method for calculating vortex-induced dynamic response was
developed. A case study indicated that at primary resonance, first-order dynamic displacement response is greater than
higher-order mode responses, but the influence of dynamic moment and shearing force ofhigher-order modes cannot be
ignored. The natural frequency of risers decreased sharply with increasing length of the riser, but increased with
increasing top tension. Various factors should be considered to avoid vortex-induced vibration in practical application,
and the influence ofvortex-induced vibration could be estimated by calculating the fatigue lifetime ofriser.
Key words: Drilling riser, strength, vortex-induced, stability
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