Analysis on Dynamics and Configurations of Deepwater Drilling Riser Systems

doi:10.11885/j.issn.1674-5086.2016.03.01.01

Abstract

Abstract: Aim at the problem of drilling riser systems, this paper summarizes the basic configurational characteristics of marine drilling risers and uses the variational principle to derive mathematical dynamics equations for drilling risers. A model was constructed for the dynamic responses of drilling risers subjected to wave loads by determining the boundary conditions for the rotational stiffnesses of the upper and lower ends of a drilling riser. A cubic Hermite spline was used to discretize this model. The effects of different operating conditions on the deformation characteristics of the drilling riser were analyzed. The results showed that the displacement of the drilling riser decreases as the top tension increases. The type of oceanic current also significantly influences the deformation characteristics of drilling risers. The surface velocity of the oceanic currents has a highly significant impact on the drilling riser deformations, that is, the drilling riser displacements greatly increase with the increasing surface velocity. Under ordinary marine conditions with low wind speeds, the effects of the wind speed on the dynamic responses of a drilling riser are very small. However, the drilling riser displacement will increase significantly if extreme weather conditions (e.g., typhoons) are encountered by the system.

Key words: drilling riser, dynamic responses, system configuration, marine environments, deepwater drilling

CLC Number:

TE951

WANG Guorong, ZENG Cheng, MAO Liangjie, LI Yang. Analysis on Dynamics and Configurations of Deepwater Drilling Riser Systems[J]. 西南石油大学学报(自然科学版), 2018, 40(3): 156-163.

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