A new concept Spar-FPSO is proposed for deepwater oil field development integrating the advantages of the deep-draft Spar concept and for oil storage. Unlike conventional ship-shaped FPSOs, the Spar FPSO uses the oil-over-water storage method or oil-water displacement technology for oil storage, which is similar to that used in the fixed gravity-based platforms. In order to investigate the VIM’s influence to mooring line tension and the platform motion characters, towing model test and wave basin model test are done. Based on model test conclusions, some corrections are added to numerical model, and perform a good consistency between numerical results and model test values. And from a full scale numerical stimulation, the VIM ‘s effect on the mooring tension and Spar-FPSO’s offset are discussed. A simple mooring line fatigue sensitivity analysis about VIM’s influence is done by using API simple summation method. VIM phenomenon lead to a more complex mooring tension distribution, higher offset motion and more serious mooring line fatigue problem. In order to better understand VIM character, more studies are needed.
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