Abstract
The exploration of the Arctic region for oil and gas resources is considered to be extremely technically challenging. Design criteria for the current drilling rigs are mainly emphasized open sea environmental conditions without sufficiently taking the ice load impact into account. However, most of the arctic oil regions have combined icing and open water conditions during the whole year time. This paper aims at optimizing the dynamic performance of a semi-submersible production system under both ice loads and wave loads. A complete numerical production system includes a semi-submersible platform, 12 mooring lines, and 22 drilling risers are established. Potential flow theory and Morison equation are combined to calculate wave loads. Ice load is solved by the discrete element method. The slender system is analyzed using the finite element method. Fully coupled time-domain algorithms are employed to investigate the dynamic performance of the production system under ice or wave loads. Platform motions and mooring lines' tension forces are quantitatively investigated under desired marine loads. The research work of this paper will provide a reference for safety performance evaluation of the arctic oil and gas production system.
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