Hydrodynamic Analysis Of FPSO With Multi-point Mooring System In Shallow Waters

With the rapid development of offshore oil and gas exploitation,people’s perception of FPSO has been increasing,the market demand has become diversified and the study of nonship shaped FPSO has become a hotspot.To satisfy the demand for developing marginal oil fields in shallow waters,and to make up for some shortcomings of traditional ship shaped FPSO,a concept of Fillet Inverted Quadrangular Frustum Pyramid Shaped FPSO IQFP has been proposed.The author undertook the following work on the basis of the model of IQFP.Firstly,verification of the rationality of IQFP design has been carried out by comparing hydrodynamic performance of ship-shaped FPSO,cylindrical FPSO and IQFP.Secondly,the analysis of the factors affecting the motion and natural periods was performed.Therefore,an optimum design of IQFP with excellent performance was proposed considering the balance between hydrodynamic performance and stability.Thirdly,based on the initial design of mooring system,two methods were used to simulate the performance of two types of mooring systems(i.e.steel catenary and polyester taut).Next,the sensitivity analysis of some mooring parameters affecting the taut mooring performance was conducted to propose an improved design of mooring system with more sensible stiffness and satisfaction in the rules and specification.Eventually,according to the conclusion mentioned,a mooring system for optimum IQFP has been proposed and estimated in both intact and damaged conditions.MOSES was used to analyze the dynamic and mooring performance.Relationships between motion and stability,motion and tension were comprehensively weighed in order to make an optimum design in floating hull and mooring system.The results will provide some reference for the design and manufacture of the new concept of FPSO in shallow waters.