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Tyne, Trent and Tors gas fields

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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.

The fields

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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
Field Tyne Trent Kilmar Garrow
Blocks 44/18a 43/24 43/22a 42/25a, 43/21a
Discovered January 1992 March 1991 1992 1991
Original Licensee ARCO/Talisman ARCO/Talisman ATP Oil & Gas (UK) Limited ATP Oil & Gas (UK) Limited
Reservoir type Carboniferous Carboniferous Carboniferous Rotliegendes
Recoverable reserves 415 billion cubic feet (bcf) 311 bcf

Development

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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
Installation Tyne Trent TP Trent compression TC Kilmar Garrow
Offshore Block 44/18a 43/24 43/24 43/22a 42/25a
Coordinates 54.591667 4.611111 54.446833 1.748789 54.444114 1.743375 54.290617 1.336208 54.273250 0.99633
Initial Owner ARCO ARCO Perenco ATP Oil & Gas (UK) Limited ATP Oil & Gas (UK) Limited
Later Owners Perenco Perenco Perenco Alpha Petroleum Alpha Petroleum
Function Wellhead, Production Wellhead, Production Production, compression Wellhead, Production Wellhead, Production
Crew Normally unattended Bridge linked to Trent Normally unattended Normally unattended
Water depth, metres 18 49 49 54 54
Installation date 1996 1996 2005 2006 2006
Jacket type Fixed steel Fixed steel Fixed steel Fixed steel Fixed steel
Jacket legs 4 4 4 4 4
Jacket piles 4 Suction piles
Jacket weight, tonnes 665 1,540 1,583 1,152
Topsides dimensions, metres 20 x 21 30 x 30
Topsides weight, tonnes 785 2,668 1,418 424
Well slots, wellheads ?, 5 9, nil 3 3, 2
Export to Trent TP via 56.5 km 20” pipeline Bacton gas terminal via 164 km 24” pipeline – Trent via 21.2 km 12” pipeline Kilmar via 22.4 km 8” pipeline
Production start November 1996 November 1996 2005 2006 2007

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

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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
Name Tyne South Tyne North Trent Kilmar Garrow
Production start November 1996 1997 November 1996 2006 2007
Peak flow, mcm/y 539 255 521 271 53
Peak year 1997 1998 1999 2007 2007
Cumulative production to 2014 3,094 1,139 3,350 1,247 172
Production ceased November 2015 November 2015 June 2020 June 2020 June 2020

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

Decommissioning

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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

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  1. ^ a b "Tyne and Trent gas fields". abarrelfull.wikidot.com. Retrieved 7 December 2021.
  2. ^ a b "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. ^ a b c "Oil and Gas UK – Field data". gov.uk. 6 October 2016. 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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