Prediction of Load and Response of an Arctic SPAR in Ice

Abstract

Arctic environmental condition is extremely harsh. Shtokman field in Barents Sea is studied to conclude to the most important factors for design of offshore structures to facilitate drilling and production. In geographical areas where the occurrence of drifting ice coexists with a large water depth at the field’s location, a floating with conical surface and disconnectable mooring system as a desirable selection need to be developed which can cope with both open water and ice loading. Methods to estimate environmental forces especially the level ice actions on conical structures are reviewed. Metocean data is derived from the environmental data of Shtokman field. Model test data for both fixed and moored models is analysed, the ice actions and response in model scale are studied. Level ice action signal varying with time are derived. A panel model is created by commercial software Sesam GeniE, and Sesam HydroD performs the 1st order hydrodynamic modelling for the model in frequency domain. Finally Sesam DeepC is used for static and dynamic analysis for the SPAR with author-designed mooring system in time domain.