Decommissioning
Operated Asset – Helvellyn
Waldorf Petroleum Resources Limited has the responsibility for leading and managing decommissioning operations for the United Kingdom Continental Shelf (UKCS) Southern North Sea (SNS) Helvellyn asset.
The Helvellyn field is located in block 47/10a within UKCS SNS, 48km east of the DGT. It comprises of a single subsea well completed with a subsea production xmas tree, protected by a Wellhead Protection Structure (WHPS) in a water depth of 29m. Production commenced in 2004 and gas was exported through an 8“ pipeline via the Amethyst platform and onwards to the DGT. Production ceased in January 2017 and the pipeline and umbilical have been cleaned and positively isolated in 2022. Plans to progress the decommissioning activities are underway with the focus on well P&A.
Non-Operated Assets
Waldorf have minority holdings in the following assets which are in or are entering the decommissioning phase. The decommissioning workscopes will be led by the respective operators.
Cladhan (33.5% Working interest)
Operated by TAQA. Cladhan consists of a 3 well subsea tie-back to Tern.
Production ceased 2024, disconnection activity commenced in 2024.
Broom (29% Working interest)
Operated by EnQuest. Broom consists of a 7 well tie-back to Heather.
Production ceased 2020, disconnection activity commenced in 2024.
Rochelle (20.7% Working Interest)
Operated by CNOOC. Rochelle consists of a 2 well tie back to the Scott platform.
Production ceased 2019, disconnection activity commenced in 2024.
Tors (17% Working Interest)
Operated by Energean. Tors consists of the 2 well Garrow and 3 well Kilmar NUIs tied back to Trent.
Production ceased in 2020. Decommissioning activity commenced in 2024.
Wenlock (20% Working Interest)
Operated by Energean. Wenlock comprises of a three wells NUI tied back to Indie and one E&A well.
Production ceased in 2022. Decommissioning activity commenced in 2024.
Brent System (Working Interest 1.18%)
Operated by TAQA. Sleeping owner share of Cormorant Alpha and PL04 Brent pipeline to SVT. Transportation expected to cease in 2024.
Goldeneye (7.03% Working Interest)
Operated by Shell. Platform and Wells decommissioning is complete. Pipeline has possible reuse for Acorn CCS project.
| Helvellyn combined Decommissioning Programmes | Download |
| Helvellyn Pipelines Comparative Assessment | Download |
| Helvellyn Environmental Appraisal | Download |
Please email decom@waldorf-production.com for any decommissioning enquires.