Abstract
A dynamic analysis model for the drilling riser was established and applied under normal drilling and hang-off conditions by distinguishing the boundary condition. This model was discretized by the FEM and solved by Newmark β method. The correctness of this model was verified through an experiment. Results indicate that the lateral displacement distribution and riser stress increase with the current speed and platform drift distance. A platform that drifts along the current is conducive to counteract the rotation of the upper joint but promotes the rotation of the bottom joint of the riser. A riser that is approximately 2,000 m long under normal drilling condition can withstand the current loads for a 10-year return period. The hang-off riser should be evacuated after being disconnected from the bottom along with the current as soon as possible. In addition, the riser that evacuated under soft hang-off condition can significantly reduce stress but enlarge the rotation angle of the upper flexible joint.
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