It told the Oslo bourse: “Due to recent developments within Petrobras, the company no longer believes the contracts will be concluded in the timeframe or on the previously approved commercial terms.”

In its third quarter report, Seadrill said Petrobas had agreed to stretch the deals for the semi-subs West Taurus and West Eminence for a firm period of three years each with total potential revenue of $1.1bn.

Seadrill