| The underwater production system is less affected by the weather and has strong reliability,which has become the main mode for the development of deepwater oil and gas fields.Underwater production systems need to be accurately installed in order to carry out normal production activities.Therefore,it is very important to analyze the force and predict the motion for the underwater production system installation process.The Pendulous installation method(PIM)allows the heavy objects to be placed on the seabed by their own gravity like a pendulum.It is suitable for lowering large objects in deep water environment.Based on the analysis of the forces of cables and lowered objects in deep water,based on the multi-body dynamics theory,a theoretical model of cable finite segment is established.After verifying the correctness of the model with the existing literature,this model is applied to the functional cabin.lowering theoretical research.Then,based on the dynamics analysis software ADAMS,the simulation model of pendulous manifold is established.After verifying the validity of the model compared with the existing literature,the model is further applied to the simulation of functional cabin lowering.Then,in order to speed up the modeling and simulation speed,the pendulous installation multi-rigid-body dynamics simulation software is developed.The effects of fluid velocity,mass of the lowering material and total length of the cable on the lowering process were further analyzed.The effects of the constant drag coefficient and the variable drag coefficient on the lowering process were also analyzed.The research content of this paper can provide theoretical guidance for the lowering of the functional cabin of the new generation underwater production system. |
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