Oil & Gas

Operated assets

Cormorant Alpha

Cormorant Alpha is a fixed installation serving as a manned drilling and production installation for the South Cormorant field in Block 211/26a in the East Shetland Basin of the Northern North Sea.

Facts

  • The installation is owned and operated by TAQA.
  • Field discovery: September 1972
  • Date of construction: May 1978
  • Location: 100 miles North East of Lerwick (approximately 310 miles North East of Aberdeen), in water depth 150m (492ft)
  • Personnel on board: The facilities are equipped for a maximum of 171 personnel.
  • Installation structure: four leg concrete gravity base structure with a steel box girder module support frame supporting two levels of modules.

Functions

  • Main function is to drill, produce, meter and pump oil and gas.
  • Cormorant Alpha also receives oil form the Brent C, North Alwyn and North Cormorant platforms as well as from the Pelican subsea tie-back.
  • Drilling, completion, workover and maintenance of oil producing and water injection wells drilled from the installation.
  • Production and metering of oil and gas from the installation, Pelican and UMC wells and the maintenance of reservoir pressure by injection of water. Associated gas is used as gas lift and fuel, with the excess being exported into the FLAGS line via the Western Leg gas pipeline.
  • Crude stabilisation facilities for oil imported from Brent System installations, and facilities for the depressurisation of the Western Leg gas line.
  • Communications centre for the East Shetland Basin microwave network and air traffic control for the coordination of helicopter movements in the area.

Connections

  • Connected to the installation is the Pelican subsea template located on the Pelican field. Also the Central Cormorant Underwater Manifold Centre (UMC) located on the Central Cormorant field.
  • Oil from the Cormorant Alpha platform is exported to the Enquest-operated terminal facilities located at Sullom Voe in the Shetland Islands via the Brent Pipeline System.
  • Gas from Cormorant Alpha also joins the Western Leg Gas Pipeline (WELGAS) link to the Far North Liquids and Associated Gas System (FLAGS).
Eider

Eider is a fixed installation serving as a Utility facility for the Otter Field, in Block 210/15a in the East Shetland Basin of the northern North Sea.

Facts

  • The installation is owned and operated by TAQA.
  • Field discovery: May 1976.
  • Date of construction: installed in 1988. Production came on stream in November 1988.
  • Cessation of Production: January 2018
  • Location: 114 miles North East of Lerwick (approximately 315 miles north north-east of Aberdeen and approximately 13km from North Cormorant) in water depth 157.5m (517ft).
  • Personnel on board: living quarters have accommodation for 73 persons. Levels 2 and 3 of the living quarters are designated as the Temporary Refuge (TR).
  • Installation structure: a four leg, eight column steel jacket sub-structure, supporting an Integrated Deck Structure (IDS), containing a wellbay, process bay and utilities bay.

The IDS itself supports a flare boom, a drilling derrick, drilling module and Living Quarters (LQ) with helideck.

Functions

  • Eider is now in Utility Mode, providing power, chemical & system support to enable production from Otter

Connections

  • There is a two-way 33kV subsea electrical power link between the Eider and North Cormorant.
  • Injection water is imported, via a 16-inch subsea pipeline, from the Tern Alpha Installation, located 16km to the South West and distributed to Otter.
North Cormorant

North Cormorant is a fixed installation serving as a manned drilling and production installation for the North Cormorant field in Block 211/21 in the East Shetland Basin of the Northern North Sea.

Facts

  • The installation is owned and operated by TAQA.
  • Field discovery: August 1974.
  • Date of construction: 1980.
  • Location: approximately 110 miles north-east of Lerwick in the Shetland Islands ( 315 miles North North East of Aberdeen), in water 161m (528ft) deep.
  • Personnel on board: The facilities are equipped for a maximum of up to 214 personnel.
  • Installation structure: The installation consists of an eight-legged steel jacket sub-structure, anchored by piles to the seabed. The Module Support Frame (MSF), which is attached to the jacket, acts as a base support for two levels of modules.

Functions

  • The function of North Cormorant is to drill, produce, meter and pump oil and gas.

Connections

  • Oil and gas is imported from Otter (33km away) before being separated and processed via the North Cormorant process facilities. The oil is then routed to Cormorant Alpha for onward transmission through the Brent Pipeline System to Sullom Voe.
  • Crude oil from Tern is also imported and then exported to Cormorant Alpha.
  • Gas is imported from Tern and exported through the Western Leg and into the FLAGS pipeline to St Fergus Terminal.

The following pipelines are connected to the installation:

  • 16-inch oil import from Tern Alpha;
  • 12-inch two phase oil import from Otter;
  • 20-inch oil export via Cormorant Alpha into the Brent system;
  • 10-inch gas export into the Western Leg gas export pipeline;
  • 8-inch gas to/from Tern Alpha.
Tern Alpha

Tern Alpha is a fixed installation serving as a manned drilling and production installation for the Tern field in block 210/25 in the East Shetland Basin of the northern North Sea. It also serves as a production facility for the Hudson, Kestrel, Falcon and Cladhan fields.

Facts

  • The installation is owned and operated by TAQA.
  • Field discovery: April 1975.
  • Date of construction: 1988.
  • Location: Tern lies 105 miles North East of Lerwick in the Shetland Islands (approximately 310 miles north east of Aberdeen), in water 167m (548ft) deep, with the Hudson field approximately 6.5 miles West of Tern.
  • Personnel on board: The facilities are equipped for up to 175 personnel.
  • Installation structure: The installation consists of a 4-legged steel jacket sub-structure, anchored by piles to the seabed. The Module Support Frame (MSF), which is an 8-legged structure attached in one piece to the jacket, acts as a base support for two levels of modules.

Functions

  • The Tern platform serves as a production and drilling facility for the Tern, Kestrel, Hudson, Falcon and Cladhan fields.
  • It also provides production, gas lift and water injection facilities for the Hudson field, water injection facilities for the Otter and Kestrel fields and gas lift to the Falcon field.
  • Crude oil is exported to North Cormorant before joining the Brent System via Cormorant Alpha.
  • The separated gas is compressed and used as fuel gas. It is also used as lift gas for Tern, Hudson, Kestrel, and Cladhan production wells.

Connections

The Kestrel field is a subsea satellite development tied back to Tern. It became operational in Q3 2001 and comprises of two production wells and one water injection well. Also tied back to Tern are the Hudson field, operated by Dana and TAQA’s Falcon field.

The following hydrocarbon pipelines are connected to the installation:

  • 16-inch oil export to North Cormorant.
  • 8-inch gas import/export to North Cormorant.
  • 2 x 10-inch oil production from Hudson.
  • 8-inch oil production/test from Hudson.
  • 6-inch gas lift to Hudson.
  • 8-inch production line from Kestrel.
  • 4-inch gas lift line from Tern to Kestrel.
Harding

Harding is a jack-up production unit serving as a manned production facility for the Harding field, in Block 9/23b, 320km North-East of Aberdeen in the central North Sea.

Facts

  • TAQA has a 70% interest in the installation and is the operator. The other partner is Maersk who holds 30%.
  • Field discovery: February 1987.
  • The Harding oil field covers an area of approximately 20 square kilometres.
  • Reservoirs: Harding Central, Harding South, Harding South East and Harding North and North east. Morrone field is a separate accumulation to the South of Harding in 9/23b.
  • Date of construction: Construction started in 1993 and production start-up was in 1996. Location: 320km North East of Aberdeen in the Central North Sea, in water depth 110m.
  • Personnel on board: The living quarters have accommodation for 119 persons. The average POB number is 110.
  • Installation structure: Harding is a heavy-duty jack-up production unit, resting on a gravity base storage tank capable of holding 600,000 barrels of oil.

Functions

  • Harding is a production unit for the Harding field.
  • Harding has 16 oil production wells, three water injection wells, one gas injection well and two aquifer lift wells.

Connections

Oil from Harding is exported via a 24-inch diameter oil export pipeline to submerged tanker loading system.

Non-Operated Assets

Brae

The Brae Area is comprised of five oil and gas fields, Brae Area (Brae North, South & Central reservoirs), Brae East, Brae West, Braemar and Beinn.

Brae Alpha, Brae Bravo and East Brae are fixed installations serving as manned production facilities for the Brae Area and surrounding fields within the Central North Sea.

Note: Brae Bravo ceased production in December 2017, while the surround fields ceased production in July 2018. The Brae Bravo facility has been made safe and is unmanned awaiting permanent removal in 2021.

Facts

  • The Brae Area is operated by RockRose Energy and owned by TAQA Bratani Limited, TAQA Bratani LNS Limited, JX Nippon E&P (UK) Limited, Spirit Energy.
  • Field discoveries:
    • Brae Area: May 1975
    • Brae East: April 1980
    • Brae West: August 1975
    • Braemar: December 1985
    • Beinn: January 1988
  • Date of construction:
    • Brae Alpha: 1980
    • Brae Bravo: 1984
    • East Brae: 1991
  • Location:
    • Brae Alpha: 138 miles North East of Aberdeen, 5 miles west of the UK/Norway boundary in Block 16/7a, in water depth 112m (367ft)
    • East Brae: 165 miles north east of Aberdeen, in Block 16/3a, in water depth of 116m (380ft)
  • Personnel on board:
    • Brae Alpha: The facilities are equipped for a maximum of up to 368 personnel.
    • East Brae: The facilities are equipped for a maximum of up to 160 personnel.
  • Installation structure:
    • Brae Alpha: an eight-legged steel jacket supported by a fixed steel jacket substructure containing 23 modules across 3 tiers used for drilling rigs, CO2 and H2S scrubbing, oil separation, water and gas injection equipment and accommodation.
    • East Brae: a four-legged steel jacket structure, containing an Integrated Module Support Frame, housing production equipment and three topside modules, a compression module, an accommodation module and a drilling module.

Function

Brae Alpha

  • The function of Brae Alpha is to drill, produce, meter and pump oil and gas.
  • The installation provides production facilities for Brae complex fields including the Brae South, Brae Central and Brae West fields.
  • The installation also provides production facilities to various other third party fields including Enoch UK and Birch, Larch and Sycamore (Trees Area).
  • Brae Alpha provides power generation facilities for the Brae Complex.

East Brae

  • The function of East Brae is to drill, produce, meter and pump oil and gas.
  • The installation provides production facilities for the Braemar and Devenick fields via the subsea tie-back to the platform.

Connections

Brae Alpha

  • Oil from the Brae Alpha platform is exported through the Brae-Forties pipeline into the Forties Pipeline System (FPS) to the onshore Kinneil Terminal.
  • Gas from Brae Alpha is exported to the St Fergus Terminal via a tie-in to the Scottish Area Gas Evacuation (SAGE) pipeline system.
The following pipelines are connected to the installation:
  • 18-inch condensate and 18-inch gas export pipelines to East Brae.
  • 6-inch gas lift to West Brae.
  • 12-inch multi-phase flow import pipeline from West Brae.
  • Two 6-inch multi-phase flow pipelines from Central Brae.
  • 10-inch water injection to Central Brae.
  • 8-inch in 12-inch multi-phase flow import pipeline from Enoch.
  • 3-inch gas lift to Enoch.
  • Two 4-inch gas lifts to Tree Area.
  • 10-inch multi-phase flow import pipeline from Tree Area.
  • 12-inch water injection to Tree Area.

East Brae

  • Oil from the East Brae platform is exported through the Brae-Forties pipeline in to the Forties Pipeline System (FPS) to the onshore Kinneil Terminal.
  • Gas from East Brae is exported to the St Fergus Terminal via a tie-in to the Scottish Area Gas Evacuation (SAGE) pipeline system.
The following pipelines are connected to the installation:
  • 6-inch in 10-inch multi-phase flow import pipeline from Braemar.
  • 10-inch in 16-inch multi-phase flow import pipeline from Devenick.
  • 18-inch condensate and 18-inch gas import pipelines from Brae Alpha.
  • 30-inch gas export pipeline to SAGE pipeline system.
Decommissioning

We continue to safely and efficiently manage the late-life operations of our business, with a focus on maximising economic recovery and life extension; driving operational excellence across all operations; effectively managing integrity; while at the same time taking ownership of and planning for decommissioning.

When oil and gas fields end production, their facilities need to be decommissioned in accordance with all relevant legislation. TAQA is committed to early, clear and open communication with stakeholders throughout the decommissioning process to ensure this work is carried out in a responsible and appropriate way.

Between operated and non-operated assets, TAQA has a large portion of the overall UK Continental Shelf decommissioning and we intend to progress this as safely, efficiently and openly as possible.

As part of this early planning, we have commenced early plug & abandonment (P&A) for wells that are already non-producing and shut in, while assets are still operational.

TAQA’s decommissioning strategic success factors include:

  • Excellence in safety, environmental, reputational and stakeholder management;
  • Optimise value of late-life operations through to completion of decommissioning activities;
  • Retain knowledge, skills and develop internal centre of excellence for decommissioning;
  • Work with the supply chain in an ethical, fair and mutually rewarding way;
  • Drive continuous improvement through collaboration with other Operators and industry stakeholders.

For any proposed decommissioning activities, decommissioning programmes are prepared by TAQA and submitted to the Department for Business, Energy & Industrial Strategy (BEIS) and will be made available here.

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UK NEWS

25 Jan 2018

TAQA achieves milestone in extending northern North Sea field life

View press release