| 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 |
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 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.
| 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 |
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]
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 staffed multi-platform bridge-linked facilities. And Halfdan C is an unstaffed satellite of the B complex. [4] Key parameters of the installations and platforms are given in the table.
| 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 | |||||
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]
| 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 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]
| 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 |
| 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 |
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]