Southern North Sea, Decommissioning Of Gas Infrastructure

PUBLIC NOTICE The Petroleum Act 1998 AMETHYST JACKETS AND HELVELLYN RISER SECTION DECOMMISSIONING PROGRAMMES
Perenco UK Limited has submitted, for the consideration of the Secretary of State for Energy Security and Net Zero, draft Decommissioning Programmes for Amethyst jackets and Helvellyn riser section, in accordance with the provisions of the Petroleum Act 1998. It is a requirement of the Act that interested parties be consulted on such decommissioning proposals.
The items/facilities covered by the Decommissioning Programmes are the Amethyst jackets (A1D, A2D, B1D and C1D) and the Helvellyn riser section (attached to A2D jacket).
The Amethyst gas field is located in the United Kingdom Continental Shelf centred on Block 47/14a, extending into Blocks 47/13a, 47/8a, 47/9a and 47/15a in the Southern North Sea, approximately 40 kilometres due east of the Humber Estuary and the Easington Gas Terminal on the Yorkshire coast. The field consists of several separate gas accumulations: Amethyst East covers the 'A' / 'B' areas and Amethyst West covers the 'C' area.
The C1D platform was connected to AID through the infield export gas pipeline (PL776). This pipeline facilitated the transportation of produced fluids from C1D to AID, where they co-mingled with fluids produced from AID before entering the 30" Amethyst Export pipeline PL649 to Easington Gas Terminal. Similarly produced fluids from BID were conveyed via PL775 to A2D.
The Helvellyn development is located in block 47/10a. Waldorf Petroleum Resources Limited has owned this development since 2001. It consists of a single subsea well, the Wellhead Protection
Structure (WHPS), pipeline (PL1956) from the WHPS to but not including the A2D riser flange, and the umbilical (PLU1957) from the WHPS to but not including the A2D J-Tube bellmouth. Perenco UK Limited owns PL1956 from and including the A2D riser flange to A2D jacket, and PLU1957 from and including the AD2 J-Tube bellmouth to A2D jacket. The Amethyst jackets are not situated within an environmentally sensitive area. The nearest Marine Protected Area is the Holderness Offshore Marine Conservation Zone, 3km north of Amethyst C1D. The WGS84 co-ordinates of the surface facilities to be decommissioned are as follows:

·       AID: 53° 36' 38.4406" N, 00° 43' 21.3858" E.

·       A2D, PL1956 riser and PLU1957 umbilical within J-Tube: 53° 37' 21.0228" N, 00° 47' 20.6881" E.

·       B1D: 53° 33' 39.6424" N, 00° 52' 38.1894" E.

·       C1D: 53° 38' 41.7738" N, 00° 36' 08.2471" E.

Perenco UK Limited hereby gives notice that a digital copy of the draft Amethyst Jackets and Helvellyn Riser section Decommissioning Programmes can be viewed and downloaded online at https://www.perenco.com/documentation. Alternatively, a hard copy of the Decommissioning Programmes can be inspected at the location given below during office hours.
Representations regarding the Amethyst Jackets and Helvellyn Riser section Decommissioning Programmes should be submitted in writing or electronically to the following address, where they should be received by the closing date of 21st March 2025 and state the grounds upon which any representations are being made. Decommissioning Team Perenco UK Ltd 3 Central Avenue St Andrews Business Park Norwich, Norfolk, NR7 0HR
Email: Decom-Consultation@perenco.com