Govt. opens consultation on Shell’s Brent field part-decommissioning plans

Archive photo of Shell's Brent field, with all four gas and oil mine-workings in operation.
Archive photo of Shell’s Brent field, with all four gas and oil mine-workings in operation.

The British government has published a list of proposed new ‘decommissioning agreements’ on the scale and scope of such work to be carried out in the latest round of 12 N. Sea oil and gas mining plant to be removed and dismantled – or not.

Under the OSPAR convention, the law states that all such mine-working plant and equipment is to be removed from the North Sea and sea-bed – except where it is too difficult or too costly to do so.

 Central to this question is Shell’s Brent field mine-working equipment.

The government’s BEIS department’ aims to be transparent’ in its consideration of decommissioning programmes.

As a result, other government departments/agencies, non-governmental organisations, members of the public and other bodies are given the opportunity to comment on the proposals set out in a programme.

The very creation of OSPAR in the mid-1990s was triggered by the infamous mis-handling by Shell over its aborted plant to dump the Brent Spar floating oil sludge tank on the sea-bed.

List of 12 North Sea draft decommissioning programmes currently under consideration and consultation:

Field Name Field Operator Status Main points of the programme Details
Audrey Field Centrica North Sea Limited Draft programmes under consideration Topsides will be removed and recovered to shore for reuse or recycling. Jacket will be removed and recovered to shore for reuse or recycling; leg piles will be cut 3m below seabed. All subsea installations will be removed and returned to shore for reuse or recycling; steel piles will be cut 0.6m below seabed. Wells will be plugged and abandoned. Pipelines to be partially removed. Buried and stable pipelines to be left in situ. All concrete mattresses and grout bags will be recovered to shore for reuse, recycling or disposal. Buried frond mats and existing rock dump will be left in situ. Audrey Field Decommissioning Programmes (PDF, 2.67MB, 53 pages)
Saturn (Annabel) and Audrey Fields Environmental Impact Assessment (PDF, 13.4MB, 235 pages)Saturn (Annabel) and Audrey Fields Comparative Assessment (PDF, 5.24MB, 127 pages)
Saturn (Annabel) Field Centrica North Sea Limited Draft programmes under consideration All subsea installations to be removed and returned to shore for reuse or recycling. Wells to be plugged and abandoned. Pipelines to be partially removed. Buried and stable pipelines to be left in situ. Concrete mattresses and grout bags (with the exception of those at pipeline crossings) will be recovered to shore for reuse or recycling. Existing rock dump will be left in situ Saturn (Annabel) Field Decommissioning Programmes (PDF, 2.55MB, 42 pages)
Saturn (Annabel) and Audrey Fields Environmental Impact Assessment (PDF, 13.4MB, 235 pages)Saturn (Annabel) and Audrey Fields Comparative Assessment (PDF, 5.24MB, 127 pages)
Ann and Alison Centrica North Sea Limited Draft programmes under consideration All subsea installations to be removed and returned to shore for reuse or recycling.Wells to be plugged and abandoned. Pipelines to be partially removed. Buried and stable pipelines to be left in situ. Ann and Alison Decommissioning Programmes (PDF, 2.53MB, 54 pages)
Ann and Alison Comparative Assessment (PDF, 3.22MB, 119 pages) Ann and Alison Environmental Impact Assessment (PDF, 11.2MB, 192 pages)
Osprey Fairfield Fagus Limited Draft programmes under consideration Subsea Installations will be removed and recovered to shore for recycling/disposal. Pipelines, Flowlines and Umbilicals will be fully removed with the exception of the Bundles, trenched and rock dumped Umbilicals and Flexible and Umbilical Risers within the Dunlin Alpha Concrete Gravity Based Structure. Osprey Decommissioning Programme (PDF, 2.05MB, 61 pages)
Osprey Environmental Statement (PDF, 10.2MB, 164 pages)Osprey Comparative Assessment (PDF, 4.76MB, 109 pages)
Merlin Fairfield Fagus Limited Draft programmes under consideration Subsea Installations will be removed and recovered to shore for recycling/disposal. Pipelines, Flowlines and Umbilicals will be fully removed with the exception of trenched and rock dumped Pipelines and Umbilicals and Umbilical Riser within the Dunlin Alpha Concrete Gravity Based Structure. Merlin Decommissioning Programme (PDF, 1.31MB, 51 pages)
Merlin Environmental Statement (PDF, 8.54MB, 158 pages)Merlin Comparative Assessment (PDF, 5.29MB, 95 pages)
Dunlin Fuel Gas Import (DFGI) and Dunlin Power Import (DPI) Fairfield Betula Limited Draft programmes under consideration Subsea Installations will be removed and recovered to shore for recycling/disposal. Pipelines, Flowlines and Umbilicals will be fully removed with the exception of trenched and buried Pipelines and Rigid Riser and Riser Cable within the Dunlin Alpha Concrete Gravity Based Structure. DFGI and DPI Decommissioning Programme (PDF, 2.22MB, 49 pages)
DFGI and DPI Environmental Statement (PDF, 15.6MB, 151 pages)DFGI and DPI Comparative Assessment (PDF, 7.28MB, 151 pages)
East Brae and Braemar Marathon Oil UK LLC Draft programmes under consideration Removal of East Brae topsides and removal of jackets to the top of the footings. Removal of Braemar subsea installations. Pipelines to be decommissioned by partial removal and leave in situ. East Brae And Braemar Decommissioning Programmes (PDF, 10.3MB, 74 pages)
East Brae and Braemar Environmental Statement – Main Report (PDF, 14.5MB, 78 pages) East Brae and Braemar Environmental Statement – Technical Appendices (PDF, 12.8MB, 96 pages) East Brae Sub-structures Comparative Assessment (PDF, 5.96MB, 39 pages)Brae Area Subsea Assets Comparative Assessment (PDF, 6.84MB, 43 pages)
Brae Alpha, Brae Bravo, Central Brae, West Brae and Sedgwick Marathon Oil UK LLC Draft programmes under consideration Removal of Brae Alpha and Brae Bravo topsides and removal of jackets to the top of the footings. Removal of Brae Bravo flare jacket/sub structure, Central Brae, West Brae and Sedgwick subsea installations. Pipelines to be decommissioned in a variety of ways including removal, trenching and leave in situ. Brae Alpha, Brae Bravo, Central Brae, West Brae and Sedgwick Decommissioning Programmes (PDF, 15.3MB, 120 pages)
Brae A etc, Environmental Statement – Main Report (PDF, 14.6MB, 80 pages) Brae A etc. Environmental Statement – Technical Appendices (PDF, 13.3MB, 96 pages) Brae A Sub-structure Comparative Assessment (PDF, 5.27MB, 34 pages)Brae B Sub-structure Comparative Assessment (PDF, 5.44MB, 34 pages)Brae Area Subsea Assets Comparative Assessment (PDF, 6.84MB, 43 pages)
Ninian North Platform CNR Draft programme under consideration Topsides will be removed and recovered to shore. Partial removal of the Jacket to between 77.5 and 88.5m below LAT. Decommissioning in situ of jacket footings. Ninian North Platform Decommissioning Programme (PDF, 1.8MB, 61 pages)
Ninian North Platform Environmental Statement (PDF, 7.82MB, 229 pages)Ninian North Platform Comparative Assessment (PDF, 2.75MB, 92 pages)
Brent Shell U.K.  Draft programmes under consideration Removal to shore of Brent Alpha, Bravo and Charlie topsides for recycling/disposal. Removal of upper part of Brent Alpha steel jacket to 84.5m below sea level. Decommissioning in situ of Brent Alpha jacket footings. Decommissioning in situ of Brent Bravo, Charlie and Delta concrete gravity based structures. Pipelines several decommissioning options. Brent Decommissioning Programme (PDF, 12MB, 322 pages)
Brent ES (PDF, 12.5MB, 475 pages)
Brent EIA (PDF, 5.05MB, 429 pages)
Brent ES Appendix(PDF, 2.52MB, 45 pages) A suite of detailed Technical Documents which support the Decommissioning Programmes documents are available on the Shell Website
Atlantic and Cromarty BG Global Energy Limited and Hess Limited Draft programmes under consideration Manifold and Well head Protection structures (WHPS) to be removed for recycling/disposal. Partial removal of pipelines and remaining section of buried/trenched pipelines to remain in situ. Atlantic & Cromarty Decommissioning Programmes (PDF, 1.76MB, 50 pages)
Atlantic & Cromarty Stakeholder Report(PDF, 1.11MB, 32 pages)
Atlantic & Cromarty Environmental Impact Assessment (PDF, 4.5MB, 109 pages)
Atlantic & Cromarty Comparative Assessment (PDF, 2.06MB, 110 pages)
Markham ST-1 Centrica Production Nederland B.V. Draft programme under consideration Topsides and jacket will be removed and transported to shore for recycling. Leg piles will be cut 2m below seabed. Pipelines will be flushed and left buried in situ Markham ST-1 Decommissioning Programmes (PDF, 2.24MB, 39 pages)
Markham ST-1 Comparative Assessment (PDF, 1.48MB, 33 pages)
Markham ST-1 Environmental Statement (PDF, 6.49MB, 142 pages)

 

5 Dec 2017

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