Norwegian offshore drilling contractor Odfjell Drilling has secured a major assignment in the North Sea for one of its harsh-environment semi-submersible drilling units, with options for long extensions.

Two letters of intent with the same unnamed client for the rig Deepsea Atlantic “in the north sea region” have a combined firm duration of 23 months and a value of $290 million excluding integrated services, upgrades/modifications or mobilisation fees, Odfjell said.

Following the firm period, there are four priced one-well options.