Tyra Field
| Tyra Field | |
|---|---|
 Platform at Tyra East | |
| Country | Denmark |
| Region | North Sea |
| Block | 5504/11 5504/12 |
| Offshore/onshore | offshore |
| Operator | Total |
| Partners | Total Noreco |
| Field history | |
| Discovery | 1968 |
| Start of production | 1984 |
| Production | |
| Current production of gas | 237.8×106 cu ft/d (6.73×106 m3/d) |
| Estimated gas in place | 1,250×109 cu ft (35×109 m3) |
| Producing 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 , a partnership between Total, Noreco and , and operated by Total.[3] The reservoir depth is about 2,000 metres (6,600 ft) and it covers area of 90 kilometres (56 mi) in the water depth of 37–40 metres (121–131 ft).[2]
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 and fields. 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, , , , , , 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]
| Installation | Location Block | Platforms | Function | Type | Legs | Well slots | Installed | Production start | Production to |
|---|---|---|---|---|---|---|---|---|---|
| Tyra West | 6.2 | TW-A | Processing (2 x 135 MMSCFD) | Steel jacket | 4 | – | March 1982 | May 1984 | TE-E |
| TW-B | Drilling & wellhead | Steel jacket | 4 | 12 | March 1982 | May 1984 | TW-A | ||
| TW-C | Drilling & wellhead | Steel jacket | 4 | 12 | May 1983 | 1985 | TW-A | ||
| TW-D | Flare | Steel jacket | 3 | – | April–May 1983 | – | – | ||
| TW-E | Production | Steel jacket | 1984 | ||||||
| Tyra East | 6.2 | TCP-A | Processing (2 X 135 MMSCFD) & accommodation | Steel jacket | 8 | – | March–June 1983 | June 1984 | TE-E |
| TE-B | Drilling & wellhead | Steel jacket | 4 | 12 | February 1983 1982 | June 1984 | TCP-A | ||
| TE-C | Drilling & wellhead | Steel jacket | 4 | 12 | May 1983 | 1985 | TCP-A | ||
| TE-D | Flare | Steel jacket | 3 | – | April–May 1983 | – | – | ||
| TE-E | Riser | Steel jacket | 4 | – | March 1982 | 1984 | Jutland onshore | ||
| TE-F | Production | Steel jacket | 1995 |
In total, the field has 20 gas-producing wells, and 28 oil and gas-producing wells.[2]
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 405 MMSCFD.[4]
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.[4]
Produced water from the inlet separator is treated to remove and condensate and is discharged overboard.[4]
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.[9]
See also[]
References[]
- ^ Glennie, K. W. (1998). Petroleum geology of the North Sea: basic concepts and recent advances. Wiley-Blackwell. p. 343. ISBN 978-0-632-03845-9.
- ^ a b c d "Oil and Gas Production in Denmark 07. Appendix B: Producing Fields". Danish Energy Agency. Archived from the original on 2012-11-30. Retrieved 2011-01-15.
- ^ "Archived copy". Archived from the original on 2020-10-25. Retrieved 2020-01-24.
{{cite web}}: CS1 maint: archived copy as title (link) - ^ a b c d Oilfield Publications Limited (1985). The North Sea Platform Guide. Ledbury: Oilfield Publications Limited. pp. 663–78.
- ^ International Energy Agency (2006). Energy policies of IEA countries: Denmark 2006 review (PDF). OECD. p. 146. ISBN 978-92-64-10971-1.
- ^ a b Wittrup, Sanne (1 December 2017). "Største Nordsø-investering nogensinde: Tyrafelt ombygges for 21 mia. kroner". Ingeniøren (in Danish). Retrieved 22 January 2019.
- ^ "Tyra Gas Field Redevelopment". Offshore Technology. Retrieved 2021-09-06.
- ^ "Merry Christmas and Happy New Year". Port of Frederikshavn. 2018-12-19. Retrieved 2019-01-22.
- ^ a b "Efter milepæl på Tyra begynder nu jobfest i Nordsøen med arbejde til flere hundreder". JydskeVestkysten. Retrieved 2021-09-06.
- Natural gas fields in Denmark
- North Sea energy
- Maersk Oil
- Royal Dutch Shell oil and gas fields
- Chevron Corporation oil and gas fields