The B391 is managed by Paragon and owned by Paragon. On 29 March 2018 Borr Drilling Limited settled its tender offer for 100% of the shares of Paragon Offshore Limited . The B391 became operational in 1982. It has a max water depth of 400ft and a max drill depth to 20,000ft.

Previous Name(s):Noble Julie Robertson, Ocean Scotian, Arethusa Scotian, Zapata Scotian