Maersk Supply Service was awarded a contract by Perenco UK Limited to recover subsea infrastructure from the Tyne and Thames fields in the Southern UK North Sea.
The project was to complete the offshore removal and onshore disposal of subsea infrastructure from the Tyne field and the Bure Oscar and Yare Charlie area of the Thames field. MSS delivered a full-scope project including project management, detailed engineering, offshore execution and onshore disposal. The offshore work scope at Tyne was to perform recovery of the Tyne platform subsea template, and recovery of the Tyne appraisal well casing. This included cutting the casing and subsequent recovery of Tyne conductor at 44/18-2Z as well as PLET skid recovery from Bure Oscar, at Thames, Block 49/28.
NO OF VESSELS USED 1 Maersk vessel – Maersk Inventor
PROJECT DURATION September – October 2020
SAFETY PERFORMANCE Zero incidents
TYNE TEMPLATE RECOVERY WEIGHT
THAMES MAX WATER DEPTH
TYNE WELL CASING RETRIEVAL
Flexibility in Operations
Managing offshore conditions
Maersk Supply Service worked safely to remove the Tyne template, which also required excavation to allow recovery. The scope of work required the removal of all well infrastructure to a minimum of 10’ below the mudline. As the wellhead was unable to be cut internally, the team found a way to cut the Tyne wellhead externally with a Diamond Wire cutter. A significant amount of seabed had to be excavated to allow the external cut to take place and then to reinstate to the mean seabed level.
Onshore and offshore collaboration
The Bure PLET recovery consisted of pre-survey, dredging around the structure, cutting operations on the 8-inch line, and recovery of the PLET and flowline. After removal, post-survey work was finalised with onshore disposal of the subsea wellhead, Template and PLET.
Integrated Project Delivery
One Team Approach
With more than 50 years of hands-on offshore experience, Maersk Supply Service ensures safe and efficient project delivery. The project team worked together with Perenco to deliver this solutions project from project management, engineering to offshore planning and management of onshore waste disposal of recovered infrastructure.