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Analyses

Four separate scenarios are considered as follows.

•Normal Operating. This scenario represents normal drilling operations in the connected mode.

•Disconnected Mode. In the disconnected case, the wellhead, casing and tensioning system are not included.

•Drift-Off. This case simulates a connected mode drift-off analysis. The model is similar to the first case, and in addition, the drill ship is explicitly included in the model as a moored vessel.

•Emergency Disconnect. This model is initially in the connected state, but the riser is subsequently detached from the BOP.