Abstract

The paper introduces operating process of fatigue life prediction for flexible joint of deepwater riser in Liwan gas-field, the South China Sea. To solve the key technical problems of deepwater risers in LiWan3-1 gas field development, Learning from the advantages and foreign experience of high temperature high pressure flexible joints (HTHPFJ), studying the loading of flexible joints, establishing a model about the riser and the flexible joint as a whole, and time-domain dynamic analysis of the model using the professional maturity ocean pipeline calculation software according to the actual environment characteristic of LiWan3-1, extracting the time-domain response spectrum from the top of the riser as the loading of the nonlinear analysis. Then the fatigue life prediction is made based on the nonlinear dynamic analysis. Finally, the shortest life of the HTHPFJ is 15 years from the stress pattern of the fatigue life which meets the fatigue service life.

Keywords:
upstream oil & gas, department of the interior, stress pattern, effective tension, boundary condition, riser, typhoon, calculation, platform, fatigue life
Subjects:
Pipelines, Flowlines and Risers, Risers
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2014. International Society of Offshore and Polar Engineers
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