John Fredriksen's Seadrill has loaned another $25m to its subsidiary North Atlantic Drilling (NADL).
The short-term facility has also been extended from 30 April to 30 June.
The loan now totals $50m and was originally set up on 31 January.
Seadrill said: "This interim funding arrangement has been put in place while broader restructuring negotiations continue at both companies."
Seadrill, with debt of $4bn, has said it will need to redraw loans to raise fresh equity, while new money providers are guiding that bond debt will need to be converted to equity.
