Arthurian gas fields explained

Arthurian gas fields
Country:United Kingdom
Region:Southern North Sea
Locblocks:Quadrant 48, 49, 53
Owner:Mobil (initially)
Offonshore:Offshore
Discovery:1967 - 2003
Startofproduction:1989
Producingformations:Rotliegendes sandstone

The Arthurian gas fields are small natural gas producing areas in the UK sector of the southern North Sea, their names are associated with the legend of King Arthur. The fields started gas production from 1989 and several are now depleted and have been decommissioned.

The fields

Mobil instigated the field naming convention using characters, people, places and objects associated with the legendary British King Arthur. Mobil applied it to its gas fields across the southern North Sea. The Arthurian fields span Quadrants 48, 49 and 53 from Arthur in the south east to Excalibur in the north west.[1]

The Arthurian fields and the reservoir parameters are as follows. [2] [3] [4]

Arthurian fields reservoir parameters!Field!Block!Coordinates!Gas reservoir!Gas reserves (see note below)!Discovered!Original licensee(s)
Arthur53/2b 53/1d53.032447 2.3903283.7 bcm2003ExxonMobil
Avalon49/09b104 bcfDecember 1989Mobil
Camelot North53/1aLower Permian Leman sand Rotliegendes2.30 bcmNovember 1967Mobil North Sea Ltd
Camelot Central South53/1a7.20 bcmJune 1987Mobil North Sea Ltd
Camelot North East53/252.972000 2.21444Permian0.90 bcmMarch 1988Mobil North Sea Ltd
Excalibur48/17a

48/18a

53.465083 1.344583Rotliegendes7.1 bcm1988Mobil North Sea Ltd
Galahad48/1253.546722 1.360611153 bcfMobil
Gawain49/29a53.171136 2.701406Leman sands196 bcf1970ARCO
Guinevere48/17b53.414833 1.273639Permian2.07 bcm1988Mobil North Sea Ltd (25.5%)
Lancelot48/17a 48/18a53.41002 1.375306Permian5.60 bcm1986Mobil North Sea Ltd
Malory48/12d5.543611 1.244167Rotliegendes35 bcf1997Mobil
Mordred48/12bSuperior
Tristan49/29bPermian0.80 bcmMay 1976Mobil (60%)
Tristan NW49/29Granby
Note: bcm = billion cubic metres, bcf = billion cubic feet

Developments

The fields were developed with an array of platforms and subsea completions. Production from the fields was principally routed via existing infrastructure to the onshore Bacton gas terminal. [5] [6] [7] [8]

Arthurian fields offshore installations!Field!Water depth, metres!Field installations!Export to!Export pipeline, length and diameter (inches)!Production started!Decommissioned!Current or last operator
Arthur423 Subsea wellsThames 49/28A18.2 miles, 12”20052014Esso
Avalon (developed as Windermere)35Fixed steelMarkham6.8 km, 8"April 1997April 2016Ineos
Camelot North15Fixed steel CALeman 27A9 miles, 12”October 19892011ERT, Perenco
Camelot Central South15October 19892011Perenco
Camelot North East43Fixed steel CBCamelot CA1 mile, 6”December 19922002 (reused)
Excalibur27Fixed steel EALancelot5 miles, 12”October 19892017Perenco
Galahad20Fixed steel monotowerLancelot16 kmNovember 1995OperationalPerenco, Chieftan, Premier Pict
Gawain37SubseaThames 49/28A9.6 miles, 12”October 19862014Perenco
Guinevere17Fixed steelLancelot4 miles, 8”June 1993YesPerenco
Lancelot21Fixed steelBacton40 miles, 20” (LAPS)June 1993OperationalPerenco
Malory21Fixed SteelTee on Galahad -Lancelot pipeline10”October 1998OperationalPerenco
Mordred20Subsea wellGalahad
Tristan37Subsea drilled from WellandWelland & ThamesNov 19922014Silverstone
Tristan NWSubsea wellDavy15.5 km, 6”20082010Granby, Silverstone
The pipeline from Lancelot to Bacton is known as the LAPS pipeline (Lancelot Area Pipeline System).

The Lancelot installation also provided an export route for gas from the Durango and Waveney fields.

FieldWaveneyDurango
Block48/17c48/21
InstallationFixed steel platformSubsea wellhead
Water depth, metres23
OperatorARCO then PerencoBridge North Sea Ltd
ReservoirRotliegendRotliegend
Gas reserves, billion cubic feet84
Production start19982008
Export toLancelotWaveney
Pipeline, length and size7.65 km, 10-inch14.7 km, 6-inch
Pipeline numberPL1639PL2555

Production

The peak and cumulative production of gas from the Arthurian fields was as follows. [9]

Arthurian fields peak and cumulative gas production!Field!Peak production, bcm per year!Peak year!Cumulative production to 2014, million cubic metres (mcm)
Arthur0.85820052,378
Camelot North0.201990921
Camelot Central South0.6019906,015
Camelot North East0.101993498
Excalibur0.5319946,449
Galahad0.70719974,579
Gawain0.92919966,311
Guinevere0.2719942,728
Lancelot0.9319938,640
Malory0.66819994,045
Tristan0.2019921,062
Tristan NW0.026200845
Windermere (formerly Avalon)0.43819982,112
The gas production profile from Camelot Central South (in mcm) was as follows:

The gas production profile from Lancelot (in mcm) up to 2014 was as follows:The gas production profile from Excalibur (in mcm) up to 2014 was as follows:The gas production profile from Gawain (in mcm) up to 2014 was as follows:

See also

Notes and References

  1. Book: Department of Trade and Industry. The Energy Report. HMSO. 1994. 0115153802. London.
  2. Web site: Camelot gas fields. 21 November 2021. abarrelfull.wikidot.com.
  3. Web site: Lancelot complex gas fields. 21 November 2021. abarrelfull.wikidot.com.
  4. Web site: The Gawain gas field. 21 November 2021.
  5. Web site: Multiple platforms facing removal after cessation at North Sea gas complex. 11 February 2015 . 21 November 2021.
  6. Web site: Gawain field decommissioning. 21 November 2021.
  7. Web site: Perenco UK SNS Environmental Statement 2019. 21 November 2021.
  8. Web site: Oil & Gas Authority installations. 21 November 2021.
  9. Web site: Oil and gas field data. 6 October 2016 . 22 November 2021.

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