Repsol Sinopec Resources of the UK has stretched a charter for a Prosafe floating accommodation unit.
The Safe Boreas will stay on in the North Sea for another 21 days, to 27 January.
It is operating in the Montrose A sector, Cyprus-based Prosafe said.
The day rate has been reduced consistent with market conditions.
Prosafe won a 21-day extension at the start of this year.
