Mooring Characteristics Of The Inner Turret Moored FPSO

Due to the rapid development of industry and economy of the world, the demands for oil and natural gas are also increased dramatically. With the land oil and gas resources been mined continuously, countries pay more and more attention to the development and utilization of offshore oil and gas resources.The exploitation of marine oil and gas resources has gradually been developed from the offshore areas to the deep ocean. Floating Production Storage and Offloading(FPSO), which is the current most efficient marine equipment for the development of offshore oil and gas, has also been widely used. Based on the purpose of engineering applications, the analysis of the inner turret moored FPSO has been done in hydrodynamic characteristics, motion response and arrangement of the turret mooring chains in this thesis.Firstly, the research status of the FPSO and the theoretical basis of the numerical calculations were introduced. Then based on three-dimensional potential flow theory, FPSO system is calculated and analyzed by using the multi-body hydrodynamic software-AQWA. Frequency domain hydrodynamic of the FPSO has been calculated by AQWA-LINE. On this basis, after selecting the relevant environmental load parameters, by changing the longitudinal position of the turret in the hull, analyze the changes in motion response of the hull and mooring forces, using AQWA-DRIFT. Research the effect of turret position variation for weathervane FPSO suffered. Finally, the changes of motion response and mooring force of FPSO which is moored by two different arrangements of the turret mooring chains had been compared. The two different arrangements are grouping mooring form and equal mooring form.By analyzing inner turret moored FPSO systems, we know the FPSO hydrodynamic characteristics, the effect of turret position variation for weather vane FPSO suffered and the pros and cons of two different turret chain arrangements. These results provide a reference for the next inner turret moored FPSO design and development.