Halfdan field

Halfdan field
Halfdan field
Country	Denmark
Region	North Sea
Location/blocks	5505/13
Offshore/onshore	Offshore
Coordinates	55.230115N 5.005754E
Operators	Total E&P Denmark.
Owner	TotalEnergies, Nordsofonden, and Noreco.
Field history
Discovery	1998
Start of production	1999
Peak of production	6.085 million cubic metres of oil
Peak year	2006
Production
Estimated gas in place	6.9×109 m3 (240×109 cu ft)
Producing formations	Chalk

Last updated July 09, 2024

Halfdan is a significant oil and gas field in the south-western part of the Danish sector of the southern North Sea. The field has been in production since 1999. The Sif and Igor fields are satellites to Hallfdan.

The field

The Halfdan field comprises the contiguous Halfdan, Sif and Igor fields in Blocks 5505/13 and 5505/16 of the North Sea.^[1] The Sif and Igor fields are respectively to the north and east of the Halfdan field, but are exploited through the Halfdan offshore infrastructure.^[1] The south west of the field contains oil of the Maastrichian layers and the north and east area has gas of the Danian era. Key parameters of the fields are given in the table.

Halfdan, Sif and Igor reservoir^[1]^[2]
Parameter	Value
Reservoir rock	Chalk
Geological age	Danian and Upper Cretaceous
Depth, ft	2030-2100
Discovery	1998
Field delineation, Halfdan	100 km²
Field delineation, Sif	40 km²
Field delineation, Igor	109 km²
Oil density	33° API
Oil reserves	35.9 million m³
Gas reserves	6.9 billion Nm³

Owners and operators

The Halfdan field is currently owned jointly by TotalEnergies, Nordsofonden, and BlueNord. It was formerly operated by Maersk and is currently operated by Total E&P Denmark.^[3]

Production infrastructure

The Halfdan, Sif and Igor fields are exploited by three offshore installations Halfdan A, Halfdan B and Halfdan C, which were installed and came into operation sequentially. The A and B installations are manned multi-platform bridge-linked facilities. And Halfdan C is an unmanned satellite of the B complex.^[4] Key parameters of the installations and platforms are given in the table.

Halfdan Installations^[1]^[2]^[5]
	Halfdan A			Halfdan B				Halfdan C
Block	5505/13			5505/13				5505/13
Name	HDA	HDB	HDC	HBA	HBB	HBC	HBD	HCA
Coordinates	55.230115N 5.005754E			55.537992N 5.030886E				55.557225N 5.134502E
Water depth, m	43	43	43	43	43	43	43	45
Commissioned	2000	2003	2003	2002	2008	2007	2011	2008
Type	Fixed steel	Fixed steel	Fixed steel	Fixed steel	Fixed steel	Fixed steel	Fixed steel	Fixed steel
Function	Wellhead, processing	Accommodation 32 beds	Flare	Wellhead, separation	Riser, wellhead	Accommodation 80 beds	Processing	Wellhead, separation
Wells	35			37				9
Bridges	2: each about 100 metre			3: 100 to 140 metre				0
Substructure weight, t	2800	1000	1150	3050	1800	2000	3500	1100
Topside weight, t	800	2200	500	2500	1380	3000	9300	630
Wells	35			37				9

Pipelines

In addition to the offshore installations there are a number of pipelines connecting and transferring fluids within the Halfdan field and to adjacent fields which act as oil and gas export routes.^[1]^[2]

Halfdan and connected pipelines
From	To	Fluid	Length, km	Diameter, inches	Note
HDA	HBA	Gas, oil, water	1.7	12
HBA	HDA	Gas, oil, water	1.7	14
HBA	Dan	Gas, oil, water	11	20
Dan	HDA	Injection water	9	14
HDC	HBA	Gas	2	24
HCA	HBB	Gas	7	16
HCA	HBB	Oil	7	8
HDA	Dan	HP Gas	9	12
HDA	Dan	LP Gas	9	12
HDA	Gorm	Oil & condensate	19	14	Oil export route to shore
HBA	Tyra West	Gas	27	24	Gas export route to shore

Halfdan A and B have their own power supplies but are also interconnected. Halfdan C receives power from Halfdan B complex.^[1]

Oil and gas production

Oil and gas from the reservoir are produced via a number of wells. In addition water injection is used to sweep oil towards the oil production wells.^[1]^[2]

Wells

Oil production wells: 38 (Halfdan)
Gas production wells: 16 (Sif and Igor)
Water injection wells: 27 (Halfdan)

Plant capacity

The capacity of the plant on Halfdan A is: Oil 120,000 BOPD; Gas 120 MMSCFD; Produced water 115,000 BWPD.^[2]
The capacity of the plant on Halfdan B is: Oil 90,000 BOPD; Gas 125 MMSCFD; Produced water 180,000 BWPD.^[2]

Annual production and injection

Halfdan annual oil, gas and water production and water injection 1999-2013^[6]
Year	1999	2000	2001	2002	2003	2004	2005	2006	2007	2008	2009	2010	2011	2012	2013
Oil production, 1000 m³	222	1120	2365	3718	4352	4346	6000	6085	5785	5326	5465	5119	4905	4617	4150
Gas production, million normal m³	37	178	522	759	1142	1449	2582	2948	2675	3104	3401	2885	2343	1709	1389
Produced water, 1000 m³	56	237	493	367	612	2099	2825	3460	4086	4766	4814	5519	6149	6139	6099
Water injection, 1000 m³	62	13	649	2532	5162	5759	9710	11026	12107	12727	11485	11945	12277	10912	10921

Halfdan annual oil, gas and water production and water injection 2014-22^[6]
Year	2014	2015	2016	2017	2018	2019	2020	2021	2022
Oil production, 1000 m³	3674	3345	2780	2700	2385	2084	1733	1498	1433
Gas production, million normal m³	1309	1334	1191	1209	1203	1008	924	844	808
Produced water, 1000 m³	6574	7344	6709	7315	7190	7421	6879	6858	7452
Water injection, 1000 m³	11403	10760	8555	10032	8316	8823	8957	8716	8513

Future plans

Plans for future development of the field include: the Halfdan Ekofisk infills; HCA gas lift; Halfdan Tor NE infill; and Halfdan Northeast project.^[3]

It has been estimated that the field will remain economically viable until 2035.^[3]

Related Research Articles

The Brent field was an oil and gas field located in the East Shetland Basin of the North Sea, 186 kilometres (116 mi) north-east of Lerwick in the Shetland Islands, Scotland, at a water depth of 140 metres (460 ft). The field operated by Shell UK Limited was discovered in 1971 and was once one of the most productive parts of the UK's offshore assets but has reached the stage where production is no longer economically viable. Decommissioning of the Brent field is complete with the exception of Brent C, which is producing from another field. The discovery well 211/26-1 was drilled in 1971 by the semi-submersible drilling rig "Staflo". This was a major surprise at the time as the nearest land in Scotland and Norway is composed of granite and other non reservoir metamorphic rocks.

Peregrino is an oil field located offshore of Brazil, east of Rio de Janeiro, in the southwest part of the Campos Basin area with about 2.3 billion barrels of oil in place within the sanctioned area. The oil field was discovered in 2004 and was formerly known as Chinook.

B3 is a major oil and gas field in the Baltic Sea. The field is located 80 km north of the Polish coastal town Rozewie. The crude oil is also referred to as Rozewie crude. Processing, drilling and accommodation is based on the jack up rig Baltic Beta located in the field. Most of the oil is shipped by tanker to the Gdańsk refinery as a part of the refinery feedstock. The associated gas is transmitted by pipeline to the combined heat and power (CHP) plant in Wladyslawowo.

The Al Shaheen Oil Field is a production oil and gas field off the north east coast of Qatar in the Persian Gulf, 80 kilometres (50 mi) north of Doha. The oil field lies above the North Gas Field, one of the largest gas fields in the world. The field has been operated by Maersk Oil Qatar AS of Denmark until July 2017 under a production sharing agreement with QatarEnergy, on behalf of the state of Qatar. As of June 2016, QatarEnergy and the French major TotalEnergies established a new company known as North Oil Company. The new company is 70% owned by QatarEnergy and 30% by TotalEnergies. North Oil Company took over field operations on 14 July 2017.

The Hutton oil field, located on the UK continental shelf, was the location for the first ever production Tension Leg Platform (TLP).

Tyra Field is the largest gas condensate field in the Danish Sector of the North Sea. It was discovered in 1968 and production started in 1984. The field is owned by Dansk Undergrunds Consortium, a partnership between Total, BlueNord and Nordsofonden, and operated by Total. 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). The Tyra field has a number of satellite fields, including Roar, Svend and Tyra Southeast fields.

Gorm is a natural gas and oilfield in the Danish Sector of North Sea. It was discovered in 1971 and is the largest oilfield exploited by Denmark. The production infrastructure consists of five bridge-linked platforms and is operated by BlueNord. The facilities include two wellhead platforms and several processing platforms. The Rolf and Dagmar fields are satellites to Gorm.

The Dan oil field is a large oil and associated gas field in the Danish sector of the North Sea, about 200 kilometres (120 mi) west of Esbjerg. Oil and gas are produced through a complex of offshore installations. The Kraka and Regnar fields are satellites to the Dan installations.

The L4-L7 gas fields are significant natural gas producing fields in the Netherlands sectors L4 and L7 of the North Sea. They are operationally one complex which started producing gas from the L7 main platform hub in 1977 and was still partly operational in 2021.

Alwyn North is a major oil and gas field in the United Kingdom sector of the northern North Sea, 160 km east of the Shetland Islands. The field was developed through two bridge-linked offshore platforms and a number of subsea satellite wellheads. Alwyn North has been producing oil and gas since 1987 and is still (2023) in operation.

The Beryl oil field is a major crude oil production field in the UK sector of the northern North Sea, 335 km north east of Aberdeen. Production of oil started in 1976 and the field is still producing oil and gas (2021).

The Clipper gas field is a major natural gas reservoir and gas production facility in the UK sector of the southern North Sea. The field is located about 73 km north-north-east of Bacton, Norfolk; the Clipper production facility has operated since 1990.

The Skjold oil field is a crude oil and associated gas production field in the Danish sector of the central North Sea, close to the Danish-German median line. Production of oil started in 1982, peak oil was achieved in 1991 and production is expected to continue until 2038.

The Siri oil field and its satellites, Nini and Cecille, are oil producing fields in the Danish sector of the southern North Sea. Operating since 1999 and 2003 they are the most northerly of Denmark's offshore oil assets located close to the Denmark-Norway median line.

The Valdemar oil and gas field is a crude oil and gas production field in the Danish sector of the central North Sea. Production of oil and gas started in 1993, peak oil was achieved in 2009 and peak gas in 2010. Production was suspended in 2019.

The South Arne field is a major crude oil and associated gas production field in the Danish sector of the central North Sea. Production of oil and gas started in 1999, and peak oil and gas was in 2000.

The Harald field is a gas and associated condensate production field in the Danish sector of the central North Sea. Production of gas and liquids started in 1997, and peak gas was in 1998. The Lulita field is a satellite of the Harald field.

Ravn is a marginal oil field in the Danish sector of the North Sea. It started operating in 2017, with oil exported to an installation in the German sector of the North Sea. Operations were suspended in 2020, and decommissioning is currently being planned.

The Albuskjell oil and gas field is a crude oil and associated gas production field in the Norwegian sector of the central North Sea. Production of oil and gas started in 1979, peak oil and gas was achieved in 1982. Production ceased in 1998 and the field installations were dismantled by 2013.

References

1 2 3 4 5 6 7 "Danish Energy Agency" (PDF). 2014. Retrieved 7 November 2023.
1 2 3 4 5 6 "Maersk oil ESIA-16 Non-technical summary – ESIS Halfdan" (PDF). Retrieved 7 November 2023.
1 2 3 "Oil & gas field profile: Halfdan North Conventional Oil Field, Denmark". 23 November 2021. Retrieved 7 November 2023.
↑ "A Barrel full Halfdan oil and gas field" . Retrieved 7 November 2023.
↑ "OSPAR Inventory of Offshore Installations - 2021" . Retrieved 7 November 2023.
1 2 Danish Energy Agency (15 August 2016). "Monthly and yearly production" . Retrieved 8 November 2023.

This page is based on this Wikipedia article
Text is available under the CC BY-SA 4.0 license; additional terms may apply.
Images, videos and audio are available under their respective licenses.

[:0-1] 1 2 3 4 5 6 7 "Danish Energy Agency" (PDF). 2014. Retrieved 7 November 2023.

[:1-2] 1 2 3 4 5 6 "Maersk oil ESIA-16 Non-technical summary – ESIS Halfdan" (PDF). Retrieved 7 November 2023.

[:2-3] 1 2 3 "Oil & gas field profile: Halfdan North Conventional Oil Field, Denmark". 23 November 2021. Retrieved 7 November 2023.

[4] "A Barrel full Halfdan oil and gas field" . Retrieved 7 November 2023.

[5] "OSPAR Inventory of Offshore Installations - 2021" . Retrieved 7 November 2023.

[:3-6] 1 2 Danish Energy Agency (15 August 2016). "Monthly and yearly production" . Retrieved 8 November 2023.

[1]

[2]

[3]

[4]

[5]

[6]