Research On Heave Compensation Technology In The Lifting Process Of FPSO Topside Module

Floating Production Storage and Offloading(FPSO)is a key equipment for exploitation of deep-sea oil and gas resources.Because of its advantages of short construction period,strong applicability and fast income,FPSO has played an extremely important role in the field of offshore engineering equipment.The topside module is the most core part of FPSO production system,which is mainly responsible for the processing of the products from the seabed oil and gas field.In the process of FPSO construction,the installation of the topside module is a very critical step.At present,the installation of the topside module is mainly carried out by floating crane hoisting installation.However,the applicability of this method is poor,which is often limited by the dock draft and the impact of the marine environment,and the rental cost of the floating crane is relatively high.Therefore,a set of installation platform system suitable for the installation of the wharf and the lifting of the large tonnage topside module is urgently needed.Based on this demand,this paper studies the design of FPSO topside module lifting platform and the heave compensation technology of lifting system.The research work of this paper mainly includes the following contents:This paper studies the environmental factors that FPSO is subjected to during the lifting and installation of the topside module in Wharf mooring,and analyzes the factors that have the greatest influence on the heave of the FPSO hull.And the mathematical model of FPSO heave motion is established,and the suitable working condition is proposed for lifting the topside module in the wharf.The change law equation of tide is fitted,and the influence of tide on ship heave is discussed.Finally,the initial installation time of the topside module is determined according to the change law of tide.This paper studies the overall structure layout scheme of the topside module lifting platform and analyzes the whole lifting and installation process of the topside module.The key structure in the lifting platform was studied and designed,and the transient dynamics simulation was carried out with the finite element analysis software.At the same time,the strength and stability of the main parts in the lifting condition were checked to verify the rationality of the lifting platform structure scheme design.This paper studies the heave compensation system in the lifting process of the FPSO topside module,and designs the whole hydraulic lift compensation system of the FPSO topside module in combination with the actual working conditions,so as to make the system able to compensate the heave movement of the FPSO caused by the influence of the external environment in the lifting process in real time.The principle of PID control was studied,the master-slave synchronous control strategy was adopted to design the topside module lifting control system,and AMESim electromechanical and hydraulic simulation software was used to verify the system’s heave compensation ability and feasibility.Meanwhile,the main influencing factors on the compensation performance of the topside module lifting system were analyzed.The study of this project shows that the lifting scheme is feasible and the lifting system has a better heave compensation capability.This topic will help to provide new ideas and methods for the installation technology of large tonnage FPSO topside module in China,and improve the comprehensive competitiveness of China in the field of installation and construction of large equipment.