%0 Journal Article
%T Analysis of Buoyancy Module Auxiliary Installation Technology Based on Numerical Simulation Analysis of Buoyancy Module Auxiliary Installation Technology Based on Numerical Simulation
%A XU Songsen
%A JIAO Chunshuo
%A NING Meng
%A DONG Sheng
%J 中国海洋大学学报（英文版）
%D 2018
%X To reduce the requirement for lifting capacity and decrease the hoist cable force during the descending and laying process of a subsea production system(SPS), a buoyancy module auxiliary installation technology was proposed by loading buoyancy modules on the SPS to reduce the lifting weight. Two models are established, namely, the SPS lowering-down model and the buoyancy module floating-up model. The main study results are the following: 1) When the buoyancy module enters the water under wave condition, the amplitude of tension fluctuation is twice that when SPS enters water; 2) Under current condition, the displacement of SPS becomes three times larger because of the existence of the buoyancy module; 3) After being released, the velocity of the buoyancy module increases to a large speed rapidly and then reaches a balancing speed gradually. The buoyancy module floats up at a balancing speed and rushes out from the water at a pop-up distance; 4) In deep water, the floating-up velocity of the buoyancy module is related to its mass density and shape, and it is not related to water depth; 5) A drag parachute can reduce floating-up velocity and pop-up distance effectively. Good agreement was found between the simulation and experiment results
%U http://qdhb.cbpt.cnki.net/WKD/WebPublication/paperDigest.aspx?paperID=d3068afd-a20b-41bb-9947-29f379617559