The existing offshore oil/gas fields in production in the Bohai Sea are all confronted with sea ice problems in the cold years. The development of a sea ice state warning system for the winter oil production in these fields is discussed in the paper on the subsidiary topics as: the skeleton of the system, monitoring and forecasting of the sea ice condition and the offshore structural behaviours, the criteria of warnings, and the database and software networks. The system is developed for various types of offshore structures and different oceano—geographical regions in the Bohai Sea.

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