Research And Analysis On Dynamic Response Of The Mooring System Of Deepwater FPSO

With the increasing development of deepwater oil and gas industry, there have been various offshore platforms. FPSO has many advantages which can better adapt to the deep complexity of the marine environment. This paper addresses the systematic evaluation of station-keeping systems of FPSO.As the natural period of hull in heave, roll, and pitch movement is similar to that of wave energy, FPSO is prone to resonance. Compared with other platforms, movement of FPSO become more intense. Mooring system not only limits the displacement of FPSO, ensures the normal operation of the riser, but also makes the loads on mooring system to the minimum. So designing effective mooring system is the main challenge to FPSO which works in deep water. Based on three-dimensional potential theory the calculation of hydrodynamic coefficients of a turret FPSO prepare for the time domain coupled analysis next. The dynamic response of FPSO system is analyzed in time domain coupled with mooring system according to potential flow theory and FEM consider the inertial stiffness current effect and damping of mooring line. The main tool used for this analysis is AQWA software. Comparative analysis of dynamic response and efficiency between catenaries mooring and taut mooring is carried out. Finally sensitivity including drag coefficient, the axial stiffness of material operating depth to dynamic response of FPSO system is analyzed.The results show that dynamic response of FPSO system are calculated in this paper meet API specification, it can ensure the normal operation of FPSO. In deepwater the taut mooring made of polyester has more advantages which contain positioning capability and mooring Strength. The dynamic response of FPSO system is significantly affected by peak wave period, significant wave height, drag coefficient, the axial stiffness of the material and the operating depth.