DELFT, the Netherlands – Shell U.K. has contracted Allseas Group for the removal, transportation, and load-in to shore of the topsides of three of the Brent field platforms in the UK northern North Sea.
Allseas has an option for similar work on the fourth platform. The contract scope extends to the removal of Brent Alpha’s steel jacket.
This is the first job assigned toPieter Schelte, Allseas’ dynamically positioned single-lift installation/decommissioning and pipelay vessel, currently under construction at Daewoo Shipbuilding and Marine Engineering (DSME) in Okpo, South Korea.
The 382-m (1,253-ft) long, 124-m (407-ft) wide vessel will have a topsides lift capacity of 48,000 tons and a jacket lift capacity of 25,000 tons.
Brent is 186 km (116 mi) northeast of Lerwick, Shetland, in a water depth of 140 m (460 ft). Apart from Alpha, the remaining platforms Bravo, Charlie, and Delta are all concrete gravity-based structures. Topside weights range from 16,000-30,000 tons.
The program starts with the removal ofBrent Delta in 2015/2016, with the remaining topsides taken away over the following eight years.