Hydrodynamic Analysis Of Classic Floating Structure

The far-flung ocean has abundant resource and the exploitation area of ocean oil and gas is developing from offshore to deepwater and ultra-deepwater following the increase demand for oil and gas resource. Therefore, floating structures for deepwater exploitation has creep into focus for research. At present, the main platforms that can be used for deepwater oil and gas exploitation are FPSO (Floating Production Storage and Offloading system), Semi-submersible, Spar Platform and Tension Leg Platform (TLP). Technology and application of several classic floating structures in deepwater oil and gas field are introduced and analyzed in this paper to comprehend and master the latest advance and development trend.There are some mainly aspects in this paper are as follows:1) In this paper, the hydrodynamic models of four main types of floating structures which could potentially be utilized in the South China Sea, were established by using the3-D potential theory.2) In this paper, compared and analyzed four classic floating structures’1st-order force,1st-order reponse of motions and2nd-order wave drift by API of wind and JONSWAP of wave.3) In the1500m deepwater, calculated and analyzed the mooring lines’load of FPSO and Semi-submersible at the fairlead.The results indicate that the FPSO’s1st-order force and moment is more large. The heave and pitch motions of TLP are perfect. However, the roll and pitch response of Spar is perfect and comparable with that of the TLP when the peak period of random waves is low. The pitch motion of Spar is extraordinarily larger than that of Semi-submersible and TLP. The2nd-order force is small, but the drift of platforms by difference-frequency force and springing of platforms by sum-frequency force are important, so the2nd-order force can’t omit.