The North Sea Transition Authority’s Energy Pathfinder is a monthly bulletin offering visibility of activity for new oil and gas developments, decommissioning and energy transition projects.
Here Energy Voice offers a monthly guide to the latest database updates and tendering opportunities on offer for North Sea projects.
Shell has tipped further decommissioning work at the Brent field, with two contracts worth under £25 million available for tender.
The first of the two subsea contracts relates to trenching pipelines, with an estimated tender date of October 2024.
Meanwhile the second tender concerns debris clearance work at the Brent field, with an estimated tender date of October 2025.
The Brent field began producing in 1976 and planning for the decommissioning of the field has been underway for several years.
The Brent Delta platform ceased production in 2011 and its topside was removed in 2017.
Brent Alpha and Bravo ceased production in 2014, with the Bravo topside removed in 2019 followed by the Alpha topsides in 2020.
The final Brent platform, Charlie, ceased production in 2022 and has been downstaff since October 2023.
The Charlie topside is scheduled for removal in 2024.
Meanwhile, Shell told Energy Voice last year it expects to receive approval for its plans to decommission the Brent legs in 2024.
BP: Morven, Mona and Morgan Offshore Wind
Worth less than £25 million, the tender relates to jacket foundation fabrication work for the two 1.5GW fixed-bottom projects located in the Irish Sea off the coast of Lancashire.
The two wind farms are expected to begin commercial operations by 2029.
Engineering giant Kent was awarded FEED contracts to support the development of the Morgan and Mona projects, in addition to a contract for the separate Morven offshore wind farm also being developed by BP and EnBW off the coast of Aberdeen.
BP has also flagged several collaboration opportunities for the Morven project in the latest Pathfinder update.
Potential works include fixed foundation fabrication, ship building, cable manufacture, tower fabrication, onshore and offshore substations and blade manufacture.
BP and EnBW have invested heavily in the joint venture, signing a lease last year for a new office in Edinburgh to act as a base for the Morven project.
Neptune Energy: Cygnus
Neptune Energy is on the hunt for a rig for its Cygnus gas field project, signalling a tender for under £25 million.
Neptune announced first gas for the 11th well at Cygnus last year, located approximately 170km off the Yorkshire coast.
The estimated tender date for the rig award is January 15, 2024.
EnQuest has tipped further work at the Heather platform, currently set for decommissioning in two years’ time.
Valued at more than £25m, the tender and potential collaboration opportunity covers seabed clearance and debris removal around the platform.
EnQuest said its strategy is under review but set a possible tender date of 1 July 2024, with award some time in H2 that year.
First installed in 1977 and started up in ‘78, Heather lies 58 miles north-east of Shetland. A fire in a compressor module in October 2019 led EnQuest to call time on the platform the following year.
Saipem has already been picked for the Heather jacket removal, while Modern American Recycling Services Europe (MARS) in Frederikshavn, Denmark, has been awarded work to dismantle the platform once Allseas removes the topsides.
Preparation work on the project began this year, with removals expected to be mobilised in 2025.
At Thistle, EnQuest has also mooted a tender for the removal of crude oil storage (COS) tanks as well as the single anchor leg mooring (SALM) at the site.
A separate decommissioning programme for the equipment filed by EnQuest notes that the tanks are attached to the lower section of the two main legs and were initially used as buoyancy to aid installation of the Thistle jacket.
Subsequently they were used for storing the produced crude oil after the export route via the SALM buoy-offloading system was made redundant.
The SALM meanwhile was a tanker loading facility that allowed oil from the field to be transported to land prior to the existence of a subsea export pipeline.
Valued in excess of £25m, the operator expects a tender date in early June 2024.
Further collaboration opportunities at Thistle are also available for subsea remediation and debris clearance.
Thistle A is located about 125 miles north-east of Shetland in a water depth of 162m, and was downmanned in 2019 before later being approved for decommissioning in 2021.
The Saipem 7000 heavy lift vessel has already been contracted to return the 46-year-old Thistle topsides and jacket to shore, while Petrofac will undertake a three-year preparation programme.
NSTA: Bunter Sandstone modelling
The NSTA has put out a tender for subsurface modelling work aimed at increasing understanding of subsurface inter-dependencies at proposed CO2 storage sites in the southern North Sea’s Bunter Sandstone Formation (BSF).
It says key questions the work should seek to tackle include identifying the most and least important geological variables controlling pressure communication within the BSF and whether injection of CO2 at one storage site may limit the potential injection or storage capacity of CO2 at another storage site?
It also seeks to understand the influence of seabed and onshore exposure of the BSF on pressure connectivity within the aquifer.
Valued at £75,000-£130,000, full project and tender process information can be found on the government’s Contract Finder Website, though the closing date is recorded as 24th November.
Pale Blue Dot Energy has announced a townhall that is set to take place in Aberdeen later in the month.
This is in relation to the Acorn transport and storage project which is set for the north-east of Scotland.
The firm said it would like to invite interested FEED contractors to the session it will be held on 22 November.
The Pathfinder update outlines that the Project would like to “engage directly with the supply chain” to:
- Introduce the Acorn T&S Project.
- Describe the forthcoming FEED scopes.
- Introduce pre-qualification process including expectations and selection criteria.
- Provide opportunity for informal discussion with the Project team members.
Interested contractors should register their interest by visiting this link no later than 15th November 2023.
Places will be limited to 4 company representatives per company attending. The Project team will then send back a confirmation email including venue details and timing.
The French supermajor TotalEnergies gave an update on its Culzean field in Scottish waters as it looks to launch a floating wind pilot project to electrify activities.
TotalEnergies says it looks to “secure the construction and deployment of a Floating Wind Pilot (CFWP) in Scottish Marine Waters” in the latest update.
The firm explains that the project is planned to start commercial operations in 2025 and will involve the deployment of a Vestas wind turbine generator mounted on an Ocergy-designed semi-submersible floater, moored circa 2km from the Culzean facilities.
The power generated by the floating turbine will be exported to Culzean facilities through an export cable and will be controlled by systems on the Culzean platform.
Hibiscus Petroleum is set to launch a geotechnical site survey drilling on the Teal West field, the company has announced
Teal West is slated for first production next year and the firm is looking to carry out a geotechnical site survey drilling of the first production well Installation of the drill centre valve skid, flexible production flowline and Riser and dynamic.
In addition to this, Hibiscus looks to achieve “static umbilical drilling of the water injection well,” this work is set for around 15 months after first oil at the site.
The Installation of the flexible water injection flowline will also be carried out around 18 months after first oil, and the drilling and hookup of the second production well is set to be carried out 3 years following the start of production.
Spirit Energy has announced a string of decommissioning projects set for some of its UK assets.
The six projects outlined by the firm are, York, Seven Seas, Eris, Ceres, Ensign, and A-Field.
For York, Seven Seas, Eris, and Ceres, Spirit Energy explains that plans are being progressed for decommissioning the fields and consist of the following scopes:
- DP1/DP2 Vessel of Pre-decom survey
- DSV (WORK CLASS) for decommissioning preparation
- RIG VESSEL for well decommissioning
The firm says that subsea structures and pipelines will be decommissioned in a future campaign and dates will be advised in due course, relating to Seven Seas, Eris, and Ceres.
As for York, the removal of the topsides will also be advertised at a later date.
For the A-Field, wells have already been plugged and abandoned and Spirit Energy looks to decommission its facilities in the area, which are all in lighthouse mode.
These facilities include:
- The Audrey A (WD) and Audrey B (XW) Platforms
- Annabel subsea facility
- Ann subsea facility
- Alison subsea facility
CNOOC International has announced a string of upcoming tenders.
These include brownfield modification engineering services work valued at over £5 million, the construction duration for this work is set to be five years and the estimated tender date is set at the final quarter of this year.
The firm has also flagged another upcoming £5 million+ tender relating to the ocean bottom node seismic acquisition of Buzzard, this work is set to take 60 days and the estimated tender date is set for the first quarter of 2024.
CNOOC has posted another tender process relating to the Buzzard, the second of which is valued below £5 million and the work is set to span eight months.
This work is for seismic data velocity update and wave data processing for and shale discrimination, the tender process for this is estimated to commence in the third quarter of this year.
Finally, CNOOC posts business applications support work valued at sub £5 million which is set to take five years, the tender process for which will begin in the last quarter of the year.
TAQA: Harding decommissioning
TAQA has announced an upcoming tender process for the engineering, preparation, removal and disposal of the Harding platform.
The Harding platform is set to the last of TAQA’s assets to cease production and the upcoming tender is worth “>£25 million”.
The tender process for the decommissioning work is set to come to a close at the start of June next year.
The Harding facilities are located around 200 miles north-east of Aberdeen and the heavy-duty steel production unit stands on a gravity base storage tank.
TAQA had previously provided an update to the project, offering a collaboration opportunity for the removal of the facility’s legs to shore for either dismantling and onward processing or refuse.
The firm has laid out that the earliest removal period for the 32K metric tonne Harding platform will be 2028.
Ocean Winds: Arven Floating offshore wind farm
Ocean Winds has created a Pathfinder entry for the Arven Floating Offshore Wind Farm project, located around 13 miles east of the Shetland Isles.
The NSTA writes that “tendering opportunities will be provided in due course” relating to the development.
Arven is a 2.3GW floating offshore wind farm that comes from a 50:50 joint partnership between Ocean winds and Mainstream Renewable Power.
The development stands in a larger Crown Estate Scotland leasing area called Ne1 and it stands in a water depth of around 328 feet, making the location “ideally suited for floating wind,” Ocean Winds writes.
The firm also created an entry for its Caledonia offshore wind farm. This is targeting 2GW, 1.5GW of which will come from fixed foundations with the remaining 0.5GW set to be produced by floating foundations.
Ocean Winds is targeting commissioning “pre 2030” for the Caledonia project.
Hartshead Resources: Development of Anning and Somerville
Hartshead Resources has posted upcoming tenders relating to the Anning and Somerville fields in the southern North Sea.
The work posted by the firm has a contract ban of more than £25 million with an estimated tender date of 29 September 2023.
This work includes subsea EPIC, gas pipeline, MEG pipeline and all necessary subsea structures:
- Procurement and expediting (including line pipe coated MEG line pipe).
- Pipelay installation offshore.
- Stability and free span correction with rock dumping as necessary.
- Subsea structure(s) installation.
- Tie-ins at Host Platform and each Platform.
- Mattresses/rock dump.
- Pigging and pressure testing.
- Pre commissioning dewatering etc.
Anning and Somerville are set to be unmanned wellhead platforms with gas and MEG piggyback pipelines to be routed to a host platform.
BP: Mona, Morgan and Morven
UK supermajor BP has created entries on Pathfinder for its Mona, Morgan and Morven offshore wind farms.
Both Mona and Morgan sites are located in the Irish Sea and planned development concept is two fixed bottom offshore wind farms each 1.5GW capacity.
Morven has a total generating capacity of around 2.9 gigawatts (GW), enough to peower more than three million homes.
The approximately 860km2 lease is located around 60km off the coast of Aberdeen. BP writes that the project is positioned to unlock a number of investments across the country.
Along with the offshore wind development, these investments include significant expansion of electric vehicle charging infrastructure in Scotland and green hydrogen production.
Equinor has also created a listing for its Rosebank project following it receiving the green light from the NSTA recently.
The Equinor development, 80 miles north-east of Shetland, is the largest untapped oilfield in UK waters.
Project partners Equinor and Ithaca Energy will together invest $3.8bn on the project, targeting 300 million barrels of oil in the West of Shetland over two phases.
Following updates to its Liverpool Bay CCS Transport & Storage Project (LBA CCS) development in last month’s pathfinder update, Eni has launched a tender process for the installation of composite marine cables.
The “Contract Band” is set to be >£25 million and it is set to be awarded by September next year.
Technical offers should be submitted to the Italian energy giant by the end of October and the deadline for Clarifications and Evaluation is set for 20 December 2023.
Eni: Liverpool Bay CCS
Eni has signalled further information on plans for the Liverpool Bay CCS Transport & Storage Project (LBA CCS), developed as part of the HyNet hydrogen and CCS industrial cluster.
HyNet is scheduled to start in the middle of this decade, sequestering around 4.5 million tonnes of CO2 per year in depleted reservoirs off the west coast in its first phase, rising to around 10 million tonnes per year as of 2030.
To do so, it will redeveloper and repurpose assets around the Hamilton, Hamilton North and Lennox fields in the East Irish sea. Each field is serviced by a separate platform, all of which are tied back to the main Douglas production platform.
According to its Pathfinder update, the full scope of the project comprises the following elements:
- A new onshore pipeline to transport CO2 from Stanlow to Connah’s Quay, and a section of pipe north east of Stanlow, connecting CF Fertilisers at Ince to Stanlow.
- The existing onshore Point of Ayr (PoA) to Connah gas line will also be repurposed to carry CO2 in the reverse direction, with the addition of onshore compression.
- Reconfiguration of the Douglas platform to receive and distribute CO2 to the Hamilton Main, Hamilton North and Lennox wellhead platforms and when necessary, provide heating prior to distribution.
- Following partial decommissioning, new modules will be installed on the Hamilton Main, Hamilton North and Lennox platforms to receive and inject CO2, as well as the repurposing of existing subsea natural gas pipelines for CO2.
- Development of the Hamilton Main, Hamilton North and Lennox reservoirs for CO2 storage through the drilling and re-completion of eight new injection wells by side-tracking existing production wells.
- Implementation of a programme of Monitoring, Measurement and Verification (MMV) activities to ensure the CO2 containment risk is continually assessed and maintained at a level that is as low as reasonably practicable. This includes the drilling of monitoring wells in each field and a number of sentinel wells.
In its first upcoming tender, Eni is seeking installation of composite submarine cables as part of the overall LBA project.
Valued at more than £25m, potential bidders should reach out to Eni by 15 September 2023, ahead of a tender close date of 1 October.
BW Ideol & BayWa: Buchan Wind
Secured as part of the ScotWind leasing round in early 2022, the Buchan floating wind scheme will be built in the NE8 lease area around 45 miles northeast of Fraserburgh.
The 200 sq km site will consist of around 60 floating turbines, with a total capacity of around 1GW.
Joint venture partners include BayWa, Belgian operator and developer Elicio, and floating wind etchnology group BW Ideol, working together as a consortium known as Buchan Offshore Wind – and previously subbed the ‘Floating Energy Allyance’.
In a Pathfinder update published this month, the group noted that floating foundations are “likely to be built from concrete at Ardersier Port using a tried and tested design.”
It follows a deal struck by BW Ideol in 2021 granting exclusive access to the port for foundation manufacturing at the site.
Meanwhile a route for cable landfall will be sited in the north east, though location and grid connection date remain to be confirmed – the latter in particular determining the project construction timeline.
Buchan’s developers said the project will “shortly” commence its scoping phase, adding that further updates would be published on Pathfinder as new information is made available.
Three large advisory contracts have already been placed with more than £20m of work already awarded, the partners stated in July.
Waldorf Petroleum: Garrow decommissioning
The Garrow field was first discovered in 1991 and is located within blocks 42/25a and 43/21a within UKCS SNS Basin, located 88km northeast of the Dimlington Gas Terminal (DGT). Production ceased in June 2020.
Decom activity involves removing a 415-tonne topside and a jacket weighing 1,030 tonnes in 53m of water. There are two 22.4km pipelines connected to the WPRL Kilmar platform, an 8” gas export (PL2160) and 3” chemical pipeline (PL2161).
Decommissioning work is split into three Phases: phase 1 to hydrocarbon free (HCF) the pipelines; phase 2 is to P&A the two wells, HCF the platform, put the platform into Lighthouse Mode (LHM), prepared for removal, and remove selected subsea infrastructure.
Phase 3 will be the removal of the platform and remaining subsea infrastructure onshore environmental disposal and project close out.
To assist work, Waldorf is currently tendering for two contracts, both worth under £25m.
The first covers the removal of concrete mattresses and pipelines in the platform approach area and associated decommissioning surveys, and is due by the end of October.
The second covers the plug and abandonment of two dry production wells, with bids due by 1 October.
The operator said it was also seeking potential collaboration efforts from companies willing to combine subsea decommissioning activities for Garrow with other SNS subsea work, such as Wenlock and Helvellyn.
Waldorf Petroleum: Cheviot
Walford has issued a brief update on the Cheviot field, one of the largest undeveloped fields in the UK North Sea, with estimated contingent resources of 55 million barrels (MMbbls) of oil and 120 billion cubic feet (BCF) of gas.
It was acquired via the company’s takeover of Alpha Petroleum last year.
A field development plan (FDP) for the reservoirwas submitted by Alpha in 2018, with main project contracts in place, along with plans to incorporate the Peel and Padon satellites.
However, Waldorf notes final project sanction was not achieved in 2019, and as a consequence of COVID and associated impacts on the global supply chain, it was moved back to the revised assessment stage in 2020.
In order to take operational ownership of the Cheviot prospect, Waldrof has again recycled the Cheviot development to the assess stage, with a plan to “complete studies to evaluate the potential to develop these fields as either an oil development (with potential future gas cap blowdown), or a gas development.”
It notes that these studies are ongoing as of Q3 2023.
TotalEnergies: Gryphon Alpha FPSO decommissioning
TotalEnergies is tendering and open to collaboration opportunities around work to make safe, disconnect, tow away and recycle the Gryphon Alpha FPSO.
Worth over £25m, the scope includes diving support for pipeline and manifold flushing, tree disconnection and flushing of the main pipelines linked to the vessel, moored around 100 miles off Shetland.
Other elements include work class ROV capabilities; a recovery spread for riser recovery including crane capability; tugs for station keeping and an anchor handling vessel (AHV) for disconnection of the moorings from the FPSO – and to recover moorings and anchors from the seabed.
Once disconnected, tugs will be required to tow the FPSO to a recycling facility where it will be cleaned, recycled and recovered parts disposed of.
TotalEnergies requires FPSO onshore cleaning and recycling in a UK/EU approved ship recycling facility.
It is understood the vessel will cease production and sail away some time in 2025.
The tender closes on Friday August 18.
Thistle Wind: Ayre and Bowdun Design
Thistle Wind Partners are seeking confirmation of interest for a principal designer for its Bowdun offshore wind development.
The Franco-Belgian consortium consists of Aspiravi, Deme Group and renewables developer Qair, and is developing the 1GW Bowdun scheme in the E3 ScotWind lease area, as well as the 1GW floating Ayre wind farm project east of Orkney.
In intends to enter pre-FEED this year, with scoping submission early 2024, consent application 2025, and construction targeted from 2029.
The consortium is looking for a competent party to plan, manage, monitor and coordinate health and safety in the pre-construction phase for both developments,
In its Pathfinder filing it says its preference is to appoint “an experienced external party in the capacity of Principal Designer to plan, manage, monitor, and coordinate health and safety” in the pre-construction/construction phase of both wind farms.
Parties were advised to submit their confirmations by late July.
Spirit Energy: Morecambe Emissions Reduction
Spirit Energy is seeking support to develop an emissions reduction concept at its Morecambe Hub in the East Irish Sea.
In its interim results in July, parent Centrica announced it would be extending the lifespan of the Morecambe Bay gas fields, ensuring that the area will produce to the end of the decade.
The scope of the tender is to find a concept to reduce GHG emissions at the North Morecambe Terminal by collecting waste stream/exhaust gases and, subject to regulatory approval, injecting back into geological storage.
Spirit said the work would be executed “while concurrently maximising economic recovery” from the gas fields.
Industry suppliers and consultancies are invited to indicate an interest in delivering an eventual concept design which will use expertise in CCS and brownfield development, with interested parties encouraged to consider responding in combination with expertise from across the supply chain.
Interested parties should notify the company, including a brief summary of relevant competencies and experience, after which Spirit plans to invite selected firms to engage in a preliminary collaborative dialogue on potential concepts and approaches to satisfy the functional specification and technical requirements of the project.
It will then define a sourcing process to produce a concept design for the hub.
Harbour Energy: Viking CCS
Harbour has opened a new Pathfinder entry for its Viking carbon capture storage (CCS) project, which secured government support in July as part of the government’s “Track 2” cluster process.
It looks to capture emissions from across the south Humber region, the UK’s most industrialised area, as part of a joint partnership between Harbour Energy and BP.
Viking (formerly named ‘V Net Zero’) intends to receive compressed and conditioned CO2 for transport via pipeline from Immingham to storage in depleted gas reservoirs in the Southern North Sea.
First injection is premised for 2027 with expected capacity to reach 11MT of CO2 per year by 2030.
The project consists of two main components. The first is an onshore transportation system comprising a new 55 km, 24” diameter pipeline running from Immingham to the former Theddlethorpe Gas Terminal site where it will tie into the existing LOGGS pipeline.
The second is an offshore system including the re-purposing of the existing ~120 km, 36” diameter decommissioned LOGGS gas pipeline, a new 23 km section of 36” diameter pipeline and a new NPAI (Not Permanently Attended Installation) with facilities to inject the conveyed CO2 into depleted gas reservoirs under the Southern North Sea.
Further Pathfinder updates are expected as the scheme progresses.
Hartshead: Anning and Sommerville
Having submitted its field development plans for the Anning and Somerville fields in the Southern North Sea in mid-June, operator Hartshead Resources has also posted a quartet of tender opportunities on offer.
Hartshead is planning to drill six production wells at the two fields, from two normally unmanned installation (NUI) platforms. These platforms will be tied back to Shell’s Leman Alpha installation, allowing for onward transportation and processing to Bacton, and into the gas network.
Hartshead is seeking a contractor to provide wells project management and duty holder services across the six planned wells. Valued at under £25m, the work scope of for the contract includes detailed design of all wells, as well as the provision of onshore and offshore personnel to manage, supervise and execute all well operations.
Another larger tender covers provision of a heavy-duty jackup to carry out drilling campaigns at Somerville and Anning. This would cover three wells per field over a period of around two years from Q2 2025-Q2 2027, with the possibility of additional well options to be added.
A third large tender is in the works for long well leads and third party services, including directional drilling and logging, as well as Xmas trees, wellheads, conductors, hangers and specialist equipment as well as all tubulars, handling and fishing equipment for each well.
Finally, Hartshead is also seeking a stimulation vessel or a vessel with fracking/stimulation capability, for work across the six gas wells of the Somerville and Anning field development. Valued at over £25m, it suggests this may include up to 5 fracs per well for a total of 30 frac operations beginning in Q3 2025and completed by May 2027.
Tenders for the latter three work scopes are requested by January and April 2024.
Taqa: Cormorant Alpha decommissioning
Taqa is looking to procure ROV support for an operation to remove attic oil during decom of its Cormorant field.
The contract – valued above £25m – includes supply and management of ROVSV services, identification and management of sub-contractors and the mobilisation of early offshore cell top drilling to gather information and sample cell contents
Mobilisation of a final campaign to recover all cell contents into one cell group would then be split over two summers.
The work also includes supply and management of cell contents recovery to a tanker for disposal/recycling.
Submissions are due by July 15 2023.
Tailwind/Serica Energy: Evelyn
Tailwind – recently acquired by Serica Energy – is tendering for work on a second production well at its Evelyn field.
The operator secured the COSL Innovator for work at the field last year, and Petrofac Facilities Management is now tendering for drilling services to support a four-well campaign using the semi-submersible unit.
Valued at over £25m, the first well will be drilled by Dana commencing January 2024, with tender submissions due by end June.
The Evelyn field is located in block 21/30f, license P1792, in the central North Sea, around 120 miles east of Aberdeen and in water depth of around 95m. The new production well will be drilled and tied back into the existing Evelyn subsea valve skid, where it is then tied back to the triton FPSO.
Pale Blue Dot: Acorn project
Pale Blue Dot – part of Storegga – has created new entries for a host of work across various elements of the north-east’s Acorn carbon capture and hydrogen project.
New components include work on Acorn Hydrogen, a CO2 loading terminal at Peterhead and for wider transport and storage (T&S) infrastructure.
The former – currently in pre-FEED – includes plans for a blue hydrogen plant, adjacent to the St Fergus gas terminal complex, which will reform North Sea natural gas to clean-burning hydrogen. CO2 emissions from the conversion process will be captured and sent to the Acorn T&S system where they will be permanently stored under the North Sea. This project is also in the pre-FEED stage.
The second element includes plans to develop a CO2 import facility at Peterhead Port which will expand the potential of the Acorn T&S system to accept shipped volumes of CO2 – opening up avenues for domestic industrial clusters without immediate access to storage, and potentially international shipments.
The T&S component will see existing pipeline infrastructure re-used to transport CO2 offshore from St Fergus to the Acorn store under the North Sea.
The project is currently in pre-FEED and, subject to gaining Government support through its Cluster sequencing process, is targeting moving into FEED thereafter.
Further procurement activities will be announced via Pathfinder in due course.
CNR: Strathspey decommissioning
Strathspey is a CNR-operated subsea development in the Northern North sea tied back to platforms at the Ninian field. The operator currently expects cessation of production to take place at the end of 2024.
Following CoP, there will be cleaning, flushing and well isolation across a suite of 18 wells, followed by subsea well plugging and abandonment (P&A) from 2025. Subsea structures and pipelines decommissioning will also be carried out within a “nominal five-year window” the company says.
Collaboration on the work is invited by CNR via the the Subsea Decommissioning Collaboration Project – an East of Shetland multi-operator and NSTA pilot project aiming to aggregate scale and industrialise the decommissioning of inert post CoP structures and pipelines.
Alpha Petroleum Wenlock & Helvellyn decommissioning
Alpha Petroleum – now part of Waldorf Petroleum – and Edison – now part of Neptune Energy – have filed plans for decommissioning at the Wenlock and Helvellyn gas facilities.
The Wenlock 49/12A facility is a single NUI in 25m of water with a topside weighing 435 tonnes and a jacket weighing 645 tonnes.
Installation operator Perenco UK has opened a tender for decommissioning activities associated with the Wenlock pipeline systems including project management, engineering, removal, recycling and disposal of subsea pipeline and associated protection facilities.
Valued at less than £25m, submissions are request by 1 October 2023.
A similar tender value has been set for work on the nearby Helvellyn field, for decommissioning activities associated with the Helvellyn subsea well and pipeline systems including project management, engineering, removal, recycling and disposal of subsea pipeline and associated protection facilities.
Collaboration opportunities across both projects were also welcomed.
Perenco: Ravenspurn ST3
This month Perenco issued an urgent procurement request for instrumentation and valve equipment for use at the Ravenspurn gas field, for delivery no later than 12 June.
This includes requests for flow meters, temperature transmitters and flame detectors, as well as a series of globe and ball valves.
Interested vendors were advised to contact Perenco engineers for further detailed specification and data sheets to allow “urgent tendering” to proceed.
TAQA: Harding decommissioning
The NSTA reported that TAQA Group would also like to engage early with supply chain partners on its plans to remove the Harding platform for dismantling and processing for reuse or recycling.
The Harding facilities lie approximately 200 miles north-east of Aberdeen and consist of a TPG 500 design heavy-duty steel jack-up production unit resting on a gravity base storage tank.
It comes as the operator mounts a major decommissioning push over the next decade, concluding dismantling at the Brae area and later tackling Eider, Tern, North Cormorant and Cormorant Alpha.
Shell (LON: SHEL) published a new Pathfinder entry for its Victory gas development in Block 207/1a, north west of the Shetland Islands. The company acquired control of the development via its acquisition of operator Corallian Energy last year.
The field was first discovered in 1977 and the development environmental statement was submitted in July 2022.
Lying around 10 miles from the closest pipeline infrastructure and in shallow water of around 160m, the current plan for developing the field is expected to be a single subsea well tied back to existing structures.
Victory was last year included in a clutch of projects that would be “fast-tracked” by government in a bid to boost UK energy security.
Further updates are expected in due course.
Shell & ScottishPower: CampionWind and MarramWind
Shell has also created new entries for its two ScotWind projects to be delivered with its partner ScottishPower Renewables.
The 3GW MarramWind site lies off the north-east coast in water depths of around 100 metres, while the 2GW CampionWind is around 60 miles off Aberdeen, in depths of around 77m.
The supmermajor has committed to using Scottish companies to fulfil more than 40% of its development needs.
The NSTA said details of tendering opportunities would be added in due course.
IOG: SNS Central Cluster
IOG (LON: IOG) published updates regarding work at its phased Saturn Banks project.
Operations were paused at the company’s A2 well on the Southwark field following failed remediation work earlier in the year.
Meanwhile a separate entry shows IOG is now looking to collaborate with the supply chain over the drilling 3 subsea stimulated wells as part of Phase 2A of its central cluster development.
The central cluster spans five contiguous licences in the Vulcan and Jupiter areas licences, namely P1915, P2342, P130, P039 and P2589.
It includes the Southwark, Nailsworth, Elland and Grafton fields plus several other potential additions holding conventional and tight gas.
IOG said last month that the P2589 Grafton licence, acquired in the 32nd UK Offshore Licensing Round, has undergone 3D seismic reprocessing and it is now in the process identifying two structures containing undeveloped conventional gas within the Europa field.
Formerly produced by ConocoPhillips via the unmanned platform of the same name, the site lies approximately 8 miles north-east of Southwark and directly south of Grafton. IOG said it has now renamed the prospect “Kinnegar”.
The Pathfinder entry also notes work will include installing subsea pipelines and umbilicals and brownfield topsides modifications. FEED work on Phase 2A commenced in December 2022.
Repsol Sinopec: North Cayley
Repsol Sinopec has updated its entry for North Cayley.
Originally part of the phased Montrose redevelopment on the western edge of the Forties Montrose High area, first gas from the main Cayley field brought online in 2017.
The North development was sanctioned in 2012 as a two-well gas condensate subsea development. An existing manifold lies close to the well target location and will allow enabled produced fluids to be tied in and transported back to the Montrose platform.
Subsea controls will be routed via an existing subsea controls manifold, with some topsides modifications proposed to the main controls and safety systems.
First production from North Cayley is now forecast for Q1 2025.
Repsol Sinopec: Claymore NAC
Updates for work at the Northern Area Claymore (NAC) development were also filed in May.
Repsol Sinopec said further development activity at the site is “currently progressing,” though it appears to have shifted timelines for workovers at wells C71z & C25.
First oil from C25 is now anticipated in Q3 2024.