Viking gas field

Last updated
Viking gas field
CountryUnited Kingdom
RegionSouthern North Sea
Location/blocks49/12, 49/16 and 49/17
Offshore/onshoreOffshore
Coordinates 53°26′53″N2°19′59″E / 53.44806°N 2.33306°E / 53.44806; 2.33306
OperatorConoco UK Ltd. ConocoPhillips
OwnerConoco UK Ltd. ConocoPhillips
PartnerBritoil plc
Field history
Discovery1965
Start of production1972
Peak of production1977
Abandonment2018
Production
Recoverable gas79.3×10^9 m3 (2.80×10^12 cu ft)
Producing formationsRotliegendes

The Viking gas field is a group of natural gas and associated condensate fields located under the southern North Sea about 85 miles (136 km) from the Lincolnshire coast. The field was in production from 1972 to 2018.

Contents

The field

The Viking gas field is a group of natural gas accumulations under the UK North Sea. The field is named after the area of the North Sea beneath which the field is located. [1] The gas reservoir is a Rotliegendes sandstone of Lower to Middle Permian age, at a depth of 9,100–10,200 feet (2,773–3,110 m) with a thickness of 200–500 feet (61–150 m). [2] The Viking structures run north-west to south-east and extend over Blocks 49/12, 49/16 and 49/17. [1] The field was discovered in 1965 and production started in 1972. The original gas in place amounted to 79.3 billion cubic metres. [1] Gas and associated condensate from Viking A and Viking B were both exported via the Viking A field through a 28-inch diameter pipeline to the Viking gas terminal [2] (renamed the Theddlethorpe gas terminal in 1988), Lincolnshire.

The Victor, Victoria and Vixen fields are adjacent to Viking and production from these fields is routed through the Viking offshore facilities. [2]

The Viking and Victor gas compositions and properties are as follows. [2]

Viking and Victor gas properties
CompositionNorth Viking %South Viking %Victor
Methane898991
Ethane663.6
Propane1.41.41.0
Carbon dioxide222.5
Gas gravity0.610.610.604
Mean condensate content3–6 bbl/million cu ft3–6 bbl/million cu ft1.8 bbl/million cu ft
Calorific value1030 Btu/cu ft1030 Btu/cu ft1020 Btu/cu ft

Ownership

The field was originally licensed to Conoco UK Ltd, later ConocoPhillips. In 2019 Chrysaor assumed the ownership of Conoco-Phillips North Sea Assets. [3] In March 2021 Chrysaor Holdings merged with Premier Oil to form Harbour Energy. [4]

Development

The Viking field was developed through a number of offshore installations. These are summarized in the following tables. [1] [2] [5]

ConocoPhillips Viking B offshore platforms ConocoPhillips Viking B offshore installation.jpg
ConocoPhillips Viking B offshore platforms
ConocoPhillips Viking BA North Sea offshore platform ConocoPhillips Viking BA offshore installation.jpg
ConocoPhillips Viking BA North Sea offshore platform
Viking offshore installations
InstallationLocation BlockFacilityFunctionTypeLegsWell slotsInstalledProduction startProduction to
Viking A complex49/12AD platformDrillingSteel jacket811December 1970August 1972Viking AP
AP platformProcessingSteel jacket8–March 1971August 1972Theddlethorpe gas terminal
AR platformPipeline risersSteel jacket6–July 19711972Viking AP
AC platformCompressionSteel jacket8–June 1975February 1976Viking AP
FD platformDrillingSteel jacket44July 1975July 1976Viking AD
Viking B complex49/17BD platformDrillingSteel jacket811May 1972August 1973Viking BP
BP platformProcessingSteel jacket8–June 1972August 1973Viking AR
BC platformCompressionSteel jacket8–June 1975July 1977Viking BP
BA platformAccommodationSteel jacket4–1992––
Viking CD49/17CD platformDrilling and processingSteel jacket64February 1974December 1974Viking B
Viking DD49/17DD platformDrilling and processingSteel jacket84May 1974October 1974Viking B
Viking ED49/16ED platformDrilling and processingSteel jacket84October 1974November 1975Viking B
Viking GD49/17GD platformDrilling and processingSteel jacket64June 1975July 1977Viking B
Viking HD49/17HD platformDrilling and processingSteel jacket64July 1974April 1975Viking B
Viking KD49/12KD platformProductionSteel jacket3619981998Viking BD
Viking LD49/17LD platformProductionSteel jacket3619981998Viking BD

Satellite fields

The satellite fields which exported gas via the Viking B complex were: [5]

InstallationLocation BlockFacilityFunctionTypeLegsWell slotsInstalledProduction startProduction to
Victor JD49/22JD platformProductionSteel jacket48June 1984September 1984Viking BD
Victor JM49/22Subsea wellProductionSubsea–19951995Victor JM
Victoria SM49/17Subsea wellProductionSubsea–20082008Viking BD
Vixen VM49/17Subsea wellProductionSubsea–120002000Viking BD

Production

The annual gas production from the Viking field (in millions of standard cubic feet) was: [2]

Export from the Viking B field was originally routed to the shore terminal via Viking AR. From 2009 export was re-routed to shore via the LOGGS installation. [5]

Decommissioning

The Viking A field (Viking North) was decommissioned as uneconomical in 1991. The A field platforms (except AR) were removed in 1993–4. [5]

Viking CD, DD, ED, GD & HD ceased production in 2011–15, and were removed in 2017–18. [5]

Theddlethorpe gas terminal was permanently shut-down in August 2018. Production from all connected fields ceased. [5]

See also

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References

  1. 1 2 3 4 Department of Trade and Industry (1994). The Energy Report. London: HMSO. pp. 93–4. ISBN   0115153802.
  2. 1 2 3 4 5 6 Oilfield Publications Limited (1985). The North Sea Platform Guide. Ledbury: Oilfield Publications Limited. pp. 696–716.
  3. ↑ "Chrysaor nears deal to buy Conoco's North Sea assets". Energy Voice. 18 April 2019. Retrieved 25 September 2021.
  4. ↑ "Here's what to know as Harbour Energy becomes London's top independent oil-and-gas group". Market Watch. 2021. Retrieved 25 September 2021.
  5. 1 2 3 4 5 6 ConocoPhillips (2019). "Viking Decommissioning Programmes" (PDF). ConocoPhillips. Retrieved 25 September 2021.
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