Cygnus gas field

Last updated
Cygnus gas field
CountryUnited Kingdom
RegionNorth Sea
Location/blocks44/11a, 44/12a
Offshore/onshoreOffshore
Coordinates54°34’14”N 02°17’28”E
OperatorNeptune E&P UK Ltd
OwnerSpirit Energy (61.25 %) and Neptune Energy (38.75 %)
Field history
Discovery1988
Start of productionDecember 2016
Production
Recoverable gas760×10^9 cu ft (22×10^9 m3)
Producing formationsPermian sandstones, Carboniferous

The Cygnus gas field is a natural gas reservoir and gas production facilities in the UK sector of the southern North Sea. It is about 150 km of east of the Lincolnshire coast and started gas production in 2016.

Contents

The field

The Cygnus field extends over UK offshore Blocks 44/11a and 44/12a. The field was discovered in 1988 by Marathon Oil. [1] The reservoirs are Permian Leman sandstone and Carboniferous sandstone formations and have recoverable reserves of 760 billion cubic feet. [1]

In 2019 the Cygnus gas field was jointly owned by Spirit Energy (61.25 %) and Neptune Energy (38.75 %), Neptune E&P UK Ltd operates the infrastructure. [1]

Development

Production from the field has been developed in stages. In the first stage gas was produced by wells on the Cygnus Alpha platform and then routed by pipeline to the Bacton Gas Terminal via the Esmond Transmission System. [1] The next stage entailed development of the north west part of the field produced from the Cygnus Bravo platform which was routed 7 km to the Cygnus Alpha installation. [1]

Details of the Cygnus field infrastructure are as shown. [1] [2] [3] [4]

Cygnus installations
Platform nameCygnus A WHPCygnus A PUCygnus A QUCygnus B
Block44/11a44/11a44/11a44/12a
Installation typeFixed Steel platformFixed Steel platformFixed Steel platformFixed Steel platform
Coordinates54°36’36”N  02°22’29”E54°34’14”N  02°17’28”E54°34’12”N  02°17’23”E54°35’59”N  02°11’46”E
FunctionWellheadsProcessing and utilitiesAccommodation and utilitiesWellheads
Crew66Unattended
First gasDecember 2016August 2017
Water depth, metres22.52221.722
DesignAMEC
Jacket fabricationBiFab Methil
Jacket weight, tonnes1,8583,1461,9582,194
Topside fabricationHeerema HartlepoolBiFabHeerema Hartlepool
Topsides dimensions, metres23 x 23 x 10
Topsides weight, tonnes1,4743,9112,9602,753
No. of legs484
No. of well slots10––10
No. of Wells––
Production toCygnus APU across bridgeBacton via Esmond system–Cygnus A PU
Production capacity9.1×10^6  m3 (320×10^6  cu ft ) per day–
Pipeline length and diameter–50 km, 565 mm–7.28 km, 250 mm (10 in)
Pipeline Number–PL3088–PL3086

Production

Cygnus gas has a minimum Wobbe Index of 46.6 to 46.8 MJ/m3. This is below the minimum specification for entry into the National Transmission System (47.2 MJ/m3). Cygnus gas en route to Bacton, commingles within the ETS pipeline with gas from Trent and Tors fields. The mixed gas arrives at Bacton with a minimum Wobbe index of 46.5 to 46.7 MJ/m3. If there is a reduction of gas flow from the other fields that deliver gas to Bacton then the output of Cygnus is constrained. To maintain Cygnus flow a temporary reduction of Wobbe Index from 47.2 MJ/m3 to 46.5 MJ/m3 at the NTS entry point at Bacton terminal was agreed in 2020. [5]

See also

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References

  1. 1 2 3 4 5 6 "Cygnus gas field development". www.nsenergybusiness.com. Archived from the original on 2021-03-02. Retrieved 22 December 2021.
  2. ↑ "Cygnus". www.spirit-energy.com. Archived from the original on 2018-08-14. Retrieved 22 December 2021.
  3. ↑ "Inventory of Offshore Installations". odims.ospar.org. Archived from the original on 2021-11-25. Retrieved 22 December 2021.
  4. ↑ "OGA interactive Maps". ogauthority.maps.arcgis.com. Archived from the original on 2019-01-26. Retrieved 22 December 2021.
  5. ↑ "Amendment to Network Entry Provision at Perenco Bacton Terminal" (PDF). www.gasgovernance.co.uk. Archived (PDF) from the original on 2021-12-23. Retrieved 23 December 2020.

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