Tyra Field Explained

Tyra Field
Country:Denmark
Region:North Sea
Block:5504/11
5504/12
Offonshore:offshore
Location Map:North Sea
Operator:Total
Partners:Total
Noreco
Nordsofonden
Discovery:1968
Start Production:1984
Production Gas Mmcuft/D:237.8
Est Gas Bft:1250
Formations:Danian and Upper Cretaceous Chalk

Tyra Field is the largest gas condensate field in the Danish Sector of the North Sea.[1] It was discovered in 1968 and production started in 1984.[2] The field is owned by Dansk Undergrunds Consortium, a partnership between Total, BlueNord and Nordsofonden, and operated by Total.[3] The reservoir depth is about and it covers area of in the water depth of 37-.[2] The Tyra field has a number of satellite fields, including Roar, Svend and Tyra Southeast fields.

History

In August 2017 Maersk Oil was sold to Total S.A. with the takeover completed in 2018.

Facilities

The Tyra Field has two production complexes named Tyra West and Tyra East, connected by pipelines. Tyra West includes oil and gas processing plants which in addition to the gas produced at the Tyra field, processes also gas from Halfdan field and the Valdemar oil field. The complex consists of two wellhead platforms, one processing and accommodation platform, and one gas flare stack. Tyra East processes also oil and gas from Valdemar, Roar, Svend, Tyra Southeast, Harald gas field, Lulita, Gorm and Dan oil fields. It consists of two wellhead platforms, one processing and accommodation platform, one gas flare stack, and one riser platform.[2]

The installations developed for the Tyra field were:[4]

Tyra field installations!Installation!Location Block!Platforms!Function!Type!Legs!Well slots!Installed!Production start!Production to
Tyra West6.2TW-AProcessing (2 x 135 MMSCFD)Steel jacket4–March 1982May 1984TE-E
TW-BDrilling & wellheadSteel jacket412March 1982May 1984TW-A
TW-CDrilling & wellheadSteel jacket412May 19831985TW-A
TW-DFlareSteel jacket3–April–May 1983––
TW-EProductionSteel jacket1984
Tyra East6.2TCP-AProcessing (2 X 135 MMSCFD) & accommodationSteel jacket8–March–June 1983June 1984TE-E
TE-BDrilling & wellheadSteel jacket412February 1983 1982June 1984TCP-A
TE-CDrilling & wellheadSteel jacket412May 19831985TCP-A
TE-DFlareSteel jacket3–April–May 1983––
TE-ERiserSteel jacket4–March 19821984Jutland onshore
TE-FProductionSteel jacket1995
In total, the field has 20 gas-producing wells, and 28 oil and gas-producing wells.

Fluids from the drilling & wellhead platforms are routed to an inlet three phase inlet separator on the ‘A’ processing platforms. The separator separated the fluids into gas, condensate and produced water. Gas undergoes water dehydration through contact with glycol. On TCP-A the gas is comingled with gas from Gorm, Dan and Tyra West. The combined gas stream is chilled to achieve a hydrocarbon dewpoint. The gas is compressed from 1000 to 2000 psi (pounds-force per square inch) in 5 Ruston TB5000 gas turbine driven gas compressors (24,500 brake horse power total), and is fiscally metered before export onshore to Jutland. The design export rate is 405e6ft3 per day at standard conditions.

Condensate from the inlet separator is routed to a coalescer after which it is comingled with condensate from Tyra West. The combined stream is routed successively through a 1st stage, 2nd stage and 3rd stage separators operating at successively lower pressures. Gas from the 2nd and 3rd stage separators is compressed and joins the gas from the 1st stage separator and is routed into the inlet separator. Condensate from the 3rd stage separator is fiscally metered and is exported onshore via the Gorm installation. The design export rate is 20,000 barrels/day.

Produced water from the inlet separator is treated to remove and condensate and is discharged overboard.

Produced oil is transported to the Gorm E riser platform in the Gorm field, and further through the subsea pipeline to the oil terminal in Fredericia, Denmark. Produced natural gas is transported from the Tyra East riser platform to Nybro Gas Processing Plant, Denmark, and from Tyra West riser platform to the Netherlands through the Tyra West – F3 and NOGAT pipelines.[5]

Redevelopment project

Due to the production facilities having sunk 6m Maersk Oil announced on 1 December 2017 Maersk Oil the redevelopment of Tyra Field, which would mean decommissioning the 35 year old facilities and installing new ones.[6] [7] The living and processing platform on Tyra East and Tyra West will be scrapped. One new living platform and one new processing platform will be built. The living quarter platform will be constructed by Italian EPC contractor Rosetti marino, while processing platform will be constructed in Kuala Lumpur by American EPC contractor McDermott International.

In July 2018 Modern American Recycling Services based in Frederikshavn secured a contract to scrap the two platforms.[8]

Up until the temporary closure in September 2019, the Tyra field processed 90% of all gas produced in the Danish part of the North Sea.[6]

The decommission project is estimated to cost 4 Billion DKK and the new facilities will cost 17 Billion DKK. All in all the project is expected use 1.3 million working hours.[9]

The new facilities were planned to be ready for production in July 2022, but this was postponed to July 2023 due to the COVID-19 pandemic.

Tyra field satellites

The Tyra field has a number of satellite fields. These include Roar, Svend and Tyra Southeast fields.

The characteristics of the satellite fields are as follows.[10]

FieldRoarSvendTyra Southeast
ProspectBentNorth Arne / Otto
ReservoirChalkChalkChalk
Geological ageDanian and Upper CretaceousDanian and Upper CretaceousDanian and Upper Cretaceous
Coordinates55.767485°N 4.64839°E56.178324°N 4.179324°E55.639618°N 4.882641°E
Block5504/75604/255504/12
Reservoir depth2,025 m2,500 m2,050 m
Field delineation84 km248 km2142 km2
ReservesOil 0.1 million m3

Gas 1.7 billion Nm3

Oil 0.5 million m3

Gas 0.1 billion Nm3

Oil 7.7 million m3

Gas 16.5 billion Nm3

Discovered19681975 North Arne, 1982 Otto1992
The Roar, Svend and Tyra Southeast fields are developed through three offshore installations as shown. [11]
FieldRoarSvendTyra Southeast
Production start199619962002
Water depth46 m65 m39 m
InstallationSteel STAR platformSteel STAR platformSteel STAR platform
FunctionWellhead, separationWellheadWellhead, separation
Substructure weight tonnes9501150880
Topsides weight tonnes550575550
Number of wells4 gas42 oil, 5 gas
StatusClosed 2019Closed 2015Closed 2019
Export, well fluids11 km 16-inch multiphase pipeline to Tyra Eastpipeline to Tyra Eastpipeline to Tyra East
The oil and gas production profile of the Roar, Svend and Tyra Southeast fields is as shown.
Year
199619971998199920002001200220032004200520062007200820092010
Roar32042732725928531717512198945135283024
Svend8361,356635521576397457280326324296299278195190
Tyra Southeast493343580614446377429374225
Year
201120122013201420152016201720182019202020212022Total
Roar162466882100762,891
Svend1451711831601367,759
Tyra Southeast16514898911182833833161625,644
Year
199619971998199920002001200220032004200520062007200820092010
Roar1,3321,9641,4581,2491,4071,7021,052915894860489367417398213
Svend8515284657548614338342828241627
Tyra Southeast4474521,2331,3371,108848889939911
Year
201120122013201420152016201720182019202020212022Total
Roar171242846404626427819415,809
Svend2427201615908
Tyra Southeast62661030620124855498173439112,816

See also

Notes and References

  1. Book: Glennie , K. W. . Petroleum geology of the North Sea: basic concepts and recent advances. 1998. Wiley-Blackwell. 978-0-632-03845-9. 343.
  2. Web site: Oil and Gas Production in Denmark 07. Appendix B: Producing Fields . Danish Energy Agency . 2011-01-15 . dead . https://archive.today/20121130124521/http://193.88.185.141/Graphics/Publikationer/Olie_Gas_UK/oil_and_gas_production_in_denmark_07/html/kap08.htm . 2012-11-30 .
  3. Web site: Tyra Gas Field Starts its Redevelopment | Exploration & Production . 2020-01-24 . 2020-10-25 . https://web.archive.org/web/20201025173016/https://www.ep.total.com/en/tyra-gas-field-starts-its-redevelopment . dead .
  4. Book: Oilfield Publications Limited. The North Sea Platform Guide. Oilfield Publications Limited. 1985. Ledbury. 663–78.
  5. Book: International Energy Agency. International Energy Agency. Energy policies of IEA countries: Denmark 2006 review. 2006. OECD. 978-92-64-10971-1. 146.
  6. Web site: Wittrup . Sanne . Største Nordsø-investering nogensinde: Tyrafelt ombygges for 21 mia. kroner . Ingeniøren . 22 January 2019 . da . 1 December 2017.
  7. Web site: Tyra Gas Field Redevelopment . Offshore Technology . 2021-09-06.
  8. Web site: Merry Christmas and Happy New Year . Port of Frederikshavn . 2019-01-22. 2018-12-19.
  9. Web site: Efter milepæl på Tyra begynder nu jobfest i Nordsøen med arbejde til flere hundreder . JydskeVestkysten . 2021-09-06.
  10. Web site: OSPAR . OSPAR Inventory of Offshore Installations - 2021 . 17 November 2023.
  11. Web site: Oil and gas production in Denmark 2013 .

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