[1] The reservoir is a lower cretaceous Captain sandstone with high rates of production, up to 2.8 million cubic metres (100 million cubic feet) per day at standard conditions per well and lies at a depth of 2,500 metres (8,300 ft).
Facilities were provided for the installation of a future produced water coalescer and flash drum.
[2] Gas and liquid were piped ashore to St Fergus under well pressure, via a 20 inch pipeline without using compressors, where it was processed.
[6] The topsides and jacket were removed in September 2021 and taken to Vats, Norway for dismantling and recycling.
[7] Like most North Sea fields operated by Shell, it is named after a bird - in this case Bucephala clangula, a small duck found in Scotland and elsewhere.