| The tension Leg platform is one of the most mature platform for deep-water oil and gas development and application.It has the advantages of better motion performance,strong anti-harsh environment capability and movable in deep-ocean operation.With rich oil and gas resources in the South China Sea,combining with the current international energy demand form,it’s urgent to develop the TLP suitable for the sea conditions in the South China Sea independently in order to get rid of the dependence on foreign technologies and promote the technological progress in deepsea energy development in China.This paper based on the independent research of TLP and based on the installation accident experience of Big Foot in the Gulf of Mexico in 2015,Completed the multi-body dynamic and dynamic coupling analysis of the platform tendon during installation.The main contents include:1)Tendon system stiffness analysis and verification.Aiming at the parallel model of multiple tendons in TLP system,the stiffness of tendon and system is obtained through geometric nonlinear analysis,and the stiffness matrix under static equilibrium position is given.The key hydrodynamic Parameters calculated based on the potential flow theory,the platform nonlinear quasi-static analysis and free-fall simulation were carried out by time-domain method to verify the stiffness of tendons.2)Analysis of multi-body dynamic response during tendon installation.Given tendon installation process and combined with the relative position of TSB and tendon body during the free standing of tendon,without consider the coupling effect between TSBs,the motion response of TSB and tendon under 45 different working conditions was analyzed.By judging and recognizing the position of the dangerous points in the time domain,the dangerous loading state and the sea environment are forecasted.3)Hydrodynamic study of TSB with special structure based on CFD method.Consider the groove and end surface disturbances,the change of ascending resistance of TSB and Staggered and side by side influence was studied for different slotting directions.The discussion of the threedimensional flow field in the U-shaped groove and the wall effects influence under different layout positions was discussed.4)Based on the results of TSB under the CFD method,the result of multi-body dynamic response during installation was corrected.By modified drag coefficient and lift,the single tendon of the tendon free standing Time TSB;considering the TSB coupled TSB parallel to the free standing of tendons,misclassified when the motion response in different environments.Based on the results of the comprehensive study,The TSB dynamic coupling response during tension tendon installation is given including safe. |
