Tyne, Trent and Tors gas fields

Last updated
Trent gas field
CountryUnited Kingdom
RegionNorth Sea
Location/blocks43/24
Offshore/onshoreOffshore
Coordinates54° 17’ 59” N 01° 39’ 35” E
OperatorsARCO, Perenco
OwnerARCO, Talisman; Perenco
Field history
DiscoveryMarch 1991
Abandonment2020
Production
Estimated gas in place415×10^9 cu ft (11.8×10^9 m3)
Producing formationsCarboniferous

The Tyne, Trent and Tors gas fields are depleted natural gas reservoirs and former gas production facilities in the southern North Sea, centred around the Trent installation about 115 km east of Flamborough Head, Yorkshire. The fields produced gas from 1996 to 2020.

Contents

The fields

The Tyne, Trent and Tors (Kilmar and Garrow) gas fields are located in UK Offshore Blocks 44/18a, 43/24, 43/22a, 42/25a and 43/21a. Tyne and Trent are named after English rivers that flow into the North Sea. Kilmar and Garrow are named after Tors in Cornwall, and together were referred to as the Tors development. The gas reservoirs have the following characteristics. [1] [2] [3] [4]

Reservoir characteristics
FieldTyneTrentKilmarGarrow
Blocks44/18a43/2443/22a42/25a, 43/21a
DiscoveredJanuary 1992March 199119921991
Original LicenseeARCO/TalismanARCO/TalismanATP Oil & Gas (UK) LimitedATP Oil & Gas (UK) Limited
Reservoir type Carboniferous CarboniferousCarboniferous Rotliegendes
Recoverable reserves415 billion cubic feet (bcf)311 bcf

Development

The Tyne, Trent, Kilmar and Garrow gas fields were developed over the period 1996 to 2008. Gas was produced by five offshore installations, detailed in the table. [5] [6] [2] [1]

Offshore installations
InstallationTyneTrent TPTrent compression TCKilmarGarrow
Offshore Block44/18a43/2443/2443/22a42/25a
Coordinates54.591667 4.61111154.446833 1.74878954.444114 1.74337554.290617 1.33620854.273250 0.99633
Initial OwnerARCOARCO Perenco ATP Oil & Gas (UK) LimitedATP Oil & Gas (UK) Limited
Later OwnersPerencoPerencoPerencoAlpha PetroleumAlpha Petroleum
FunctionWellhead, ProductionWellhead, ProductionProduction, compressionWellhead, ProductionWellhead, Production
CrewNormally unattendedBridge linked to TrentNormally unattendedNormally unattended
Water depth, metres1849495454
Installation date19961996200520062006
Jacket typeFixed steelFixed steelFixed steelFixed steelFixed steel
Jacket legs44444
Jacket piles4Suction piles
Jacket weight, tonnes6651,5401,5831,152
Topsides dimensions, metres20 x 2130 x 30
Topsides weight, tonnes7852,6681,418424
Well slots, wellheads?, 59,nil33, 2
Export toTrent TP via 56.5 km 20” pipelineBacton gas terminal via 164 km 24” pipeline–Trent via 21.2 km 12” pipelineKilmar via 22.4 km 8” pipeline
Production startNovember 1996November 1996200520062007

Gas export from Trent reused the 24” Esmond to Bacton pipeline (Esmond Transmission System) to the Bacton gas terminal, also known as EAGLES East Anglia Gas and Liquids Evacuation System pipeline.

Production

On the Tyne installation fluids from the wellheads were routed to the 3-phase Production Separator. The gas and condensate streams were metered then cojoined and sent to the pipeline to Trent. Separated water was metered and passed to the Produced Water Filter before disposal overboard. [7]

On Trent the fluids from Tyne were routed to a slug catcher then comingled with Trent gas from the Trent Production Separator. The combined gas stream was routed across the bridge to the TC platform. Here it passed successively to a Separator, LP Compressor, Cooler, Separator, HP Compressor, Cooler and Discharge Scrubber. The gas stream was routed back to the Production platform. Here it was dried by counter current contact with Tri-Ethylene Glycol before being sent to Bacton. [8]

An outline of the gas production from the fields is summarised in the table. [5]

Gas Production
NameTyne SouthTyne NorthTrentKilmarGarrow
Production startNovember 19961997November 199620062007
Peak flow, mcm/y53925552127153
Peak year19971998199920072007
Cumulative production to 20143,0941,1393,3501,247172
Production ceasedNovember 2015November 2015June 2020June 2020June 2020

The production profile, in mcm/y, of the Trent field was as shown. [5]

Decommissioning

Perenco submitted a Decommissioning Programme for the Tyne installation to the UK Oil & Gas Authority in 2018. [9] This will entail plugging and abandoning the wells and removal of all structures above the sea bed. Following shutdown of the Trent platform in 2020 Alpha Petroleum announced the Kilmar and Garrow would be shutdown. [10]

Since 2016 gas from the Cygnus A complex has been routed via a 55 km 24" export pipeline to a tie-in on the Esmond Transmission System (ETS) and then to Bacton. [11]

See also

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References

  1. 1 2 "Tyne and Trent gas fields". abarrelfull.wikidot.com. Retrieved 7 December 2021.
  2. 1 2 "Garrow and Kilmar gas fields". abarrelfull.wikidot.com. Retrieved 7 December 2021.
  3. ↑ "Tyne installation decommissioning Programme" (PDF). assets.publishing.service.gov.uk. Retrieved 7 December 2021.
  4. ↑ Department of Trade and Industry (1994). The Energy Report. London: HMSO. ISBN   0115153802.
  5. 1 2 3 "Oil and Gas UK – Field data". gov.uk. Retrieved 7 December 2021.
  6. ↑ "Inventory of Offshore Installations". odims.ospar.org. Retrieved 7 December 2021.
  7. ↑ Tyne Flow Scheme, Anon, undated
  8. ↑ Trent Flow Scheme, anon.
  9. ↑ "Tyne installation decommissioning Programme" (PDF). assets.publishing.service.gov.uk. Retrieved 7 December 2021.
  10. ↑ "Alpha Petroleum OSPAR Public Statement - 2020" (PDF). assets.publishing.service.gov.uk. Retrieved 7 December 2021.
  11. ↑ "Cygnus Gas Field Development". www.nsenergybusiness.com. Retrieved 7 December 2021.
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