In order to overcome the performance limitations of the traditional shiptype, cylindrical and prismatic FPSO, this paper presents a new concept of sandglass-type FPSO with new sandglasstype floating body and various function modules. For the sandglass-type model, the heave and pitch motion performance in wave were studied by potential flow boundary element and spectrum analysis methods in frequency domain, and the theories of probability and statistics were applied in the analysis of green water phenomenon. Furthermore, the variable displacement method was used to calculate the statical stability curve. Finally, by comparing with the cylindrical floating body model of Sevan Marine Company in Norway and octagon floating body model of CNOOC in China, it was found that the design of sandglass shape could obviously improve the stability and hydrodynamic characteristic of FPSO. Thus this paper provides an innovative engineering platform for the development of deepwater oil and gas.

Key words：