Abstract
Abstract In order to study the dynamic response of a drill pipe under the motion of the float platform, current and waves during the installation of a subsea production tree (SPT), a numerical model was established to analyse the mechanical properties of the drill pipe. The effects of the float platform motion on the mechanical behaviours of the drill pipe are carried out as well as the operation depth, submerged weight of the SPT, current velocity and drill pipe specification. At the same time, the evolution mechanism of the dynamic response of the drill pipe was also explored. The results show that the bending stress of the drill pipe approaches the maximum value when the platform moves to about one fourth of its period. Based on the research, the deeper the operation depth, the smaller the range of motion of the bottom of the drill pipe; the current velocity and the size of drill pipe have the greatest influence on the lateral displacement and bending stress.
Highlights
WBecause the installation of a subsea production tree (SPT) directly affects the success of deep water oil production and the economic efficiency of the whole project, an accurate grasp of the deformation and stress distribution where the SPT is attached at the bottom end has a positive effect on the ocean engineering
The governing equation of the analysis model has been deduced and solved, and the parameters that may affect the dynamic response of the drill pipe have been considered
(2) The bend stress of the pipe reaches its maximum value of 25.2 MPa at 5 m and the displacement at bottom reaches its maximum value of 12.9 m when t = TL/4 (t reflects the variable time of the drill pipe, TL reflects the response period of the platform)
Summary
WBecause the installation of a subsea production tree (SPT) directly affects the success of deep water oil production and the economic efficiency of the whole project, an accurate grasp of the deformation and stress distribution where the SPT is attached at the bottom end has a positive effect on the ocean engineering. With the rapid development and utilisation of oil and gas resources from shallow sea to deep water, study of the dynamic response of the drill pipe underwater, which is related to the cost and risk of installing the SPT, has become a difficult and hot point in drill operation. Ahmad and Datta [3,4] used the time integration method and the frequency domain iteration method to analyse the effects of the relative velocity square drag term, drift oscillation, instantaneous ship motion and the velocity of the current on the bending stress of marine risers under random waves. Wang [5] introduced the dynamic equation of horizontal motion of the riser and put forward the finite element method to solve the displacement of the riser under the action of waves and current. Guo et al [9] studied the dynamic response of the internal solitary wave, the surface wave and the platform motion and found that the internal
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