| As the development of deepwater oil and gas field started rather late, China is short oftechnology in design, construction and installation for deepwater oil and gas field. Itis necessary for China to develop underwater production system and researchinstallation method.This thesis summarizes the merits and demerits of underwater production systeminstallation methods abroad, and carries research on Pendulous Installation Method(PIM) according to the actual situation of LiWan. This thesis conducts numericalanalyses and sensitivity studies for PIM based on nonlinear multi-body couplingtheory. PIM can be divided into two stages, overboarding and pendulous motion.Simulated transport-vessel connecting manifold by slings and extending slings untilmanifold reached the specified position in Moses time domain analysis, and chosedlower velocity and environment load direction as parameters for sensitivity analysis.Simulated pendulous motion in Moses time domain analysis, and chosed environmentload direction, wave height, wind speed, flow velocity as parameters for sensitivityanalysis. As for PIM, proposed a method for computing the relatively averagehorizontal drift. This method can be used to choose the best mooring arrangementscheme, assess PIM in a sea and provide basis for a project. Simulated PIM in1000m-2000m water by limiting the surge, roll and yaw of ship instead of DP andchosed water depth, stratified flow as parameters for sensitivity analysis.This thesis built ship hydrodynamic model, sling model and manifold Morison model,chosed parameters and carried out simulation of PIM. In this process, solved somekey technical problems of PIM, formed and developed nonlinear multi-body couplingtheory for ship, sling and manifold. As for PIM in deepwater, nonlinear multi-bodycoupling theory improve the precision of calculation by taking the influence betweenslings and the PIM system. To sum up, the research and results are of great meaning inboth theory and engineering. |
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