Study On The Method Of Enhancing The Floating Stability Of The Submersible Lifting Platform

With the further exploitation of offshore petroleum gas resources,the development of tidal energy,wind energy and other emerging energy sources has greatly increased the demand for offshore engineering equipment.Compared with the construction on land,the implementation of offshore engineering is more difficult,requiring large offshore lifting equipment for loading,unloading and installation.Therefore,the demand for offshore lifting platforms is increasing,and there is still a large gap.In view of this,seated platforms with moving and lifting capabilities are widely used as dedicated lifting platforms.When lifting in shallow water,the submersible platform lifting operation is safer.However,in deep-water lifting operations,the submersible platform is used for floating lifting operations,and its floating stability is a problem that cannot be ignored.It is necessary to study it and investigate its stability law to ensure the platform safety and make it better.Serves the development of marine resources in China.This paper introduces various methods for checking the stability of the submersible lifting platform by Moses numerical simulation software,hoping to provide a reference for the stability research of similar platforms.According to the results of stability calculation,the variation law of platform floating stability was analyzed and discussed.For the complete stability part,the area ratio of the oilfield to the ocean tow varies with the wind direction angle,and the size is inversely proportional to the wind speed.Regarding the stability of the towed vessel,the trend of the vanishing angle of the stability when the left and right chord chambers are damaged varies with the wind direction angle.The volume and position of the damaged chambers have an impact on the results.For floating lifting stability,pre-ballasting must be carried out during the operation,and the ballasting scheme needs to be accurately set according to the rotation range of the operation.When the full-slewing operation is performed and the pre-ballasted boom rotation angle range is exceeded,the ballast scheme should be adjusted in time.On this basis,through the theoretical analysis of the floating state changes of the lifting platform,two methods are proposed to improve the floating stability of the lifting platform: the swing boom method and the reverse ballast method.The feasibility of the two stability improvement methods was verified by examining the floating state changes of the platform after applying the two stability improvement methods.When the swing arm method was applied to the damage of a single cabin,five criteria parameters at 72 wind direction angles of 36 models were calculated when 53 cabins were damaged.When the reverse ballast method was applied,15 ballast cabins were calculated respectively.Five criteria parameters at 72 wind direction angles for 13 ballasting schemes at break.A large number of calculations have also been carried out on the application of the swing boom method to the combined breaking and towing breaking conditions of floating lifting operations.Finally,it was proved that both methods can improve the floating stability of the platform,and pointed out the general advantages and disadvantages of the two methods in order to benefit and avoid harm,and better use these two methods.