Abstract

The marine environment, such as wind, wave and current, can have a significant effect in subsea production tree installation process and has brought difficulties and challenges. In this paper, in order to analyze riser stress and displacement in tis installation with different marine environments, the loads and boundary conditions at different installation stages are elected, and the installation stage 3 and 4 are mainly studied. Then, an analysis model and equation have been established. In this model, the riser is regarded as a beam suspended in the floating platform and subjected to both axial and lateral forces. Because, the riser would be away from subsea wellhead in installation due to its displacement and the material of riser maybe be yielding due to the huge stress, the variation of stress and displacement of riser with drag coefficient, sea surface wind velocity, sea surface current velocity and SPT weight are discussed. Results show that the stress and the displacement increase with the increase of all factors mentioned above. The effect of drag coefficient weakens as the value of Cd increases and the effect of wind velocity is greater than that of current velocity. However, the effect of SPT weight is unremarkable.

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