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. The Sif and Igor fields are respectively to the north and east of the Halfdan field, but are exploited through the Halfdan offshore infrastructure. 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 reservoirParameterValueReservoir rockChalkGeological ageDanian and Upper CretaceousDepth, ft2030-2100Discovery1998Field delineation, Halfdan100 km2Field delineation, Sif40 km2Field delineation, Igor109 km2Oil density33° APIOil reserves35.9 million m3Gas reserves6.9 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.
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 staffed multi-platform bridge-linked facilities. And Halfdan C is an unstaffed satellite of the B complex. Key parameters of the installations and platforms are given in the table.
+Halfdan InstallationsHalfdan AHalfdan BHalfdan CBlock5505/135505/135505/13NameHDAHDBHDCHBAHBBHBCHBDHCACoordinates55.230115N 5.005754E55.537992N 5.030886E55.557225N 5.134502EWater depth, m4343434343434345Commissioned20002003200320022008200720112008TypeFixed steelFixed steelFixed steelFixed steelFixed steelFixed steelFixed steelFixed steelFunctionWellhead, processingAccommodation 32 bedsFlareWellhead, separationRiser, wellheadAccommodation 80 bedsProcessingWellhead, separationWells35379Bridges2: each about 100 metre3: 100 to 140 metre0Substructure weight, t28001000115030501800200035001100Topside weight, t80022005002500138030009300630Wells35379
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. +Halfdan and connected pipelinesFromToFluidLength, kmDiameter, inchesNoteHDAHBAGas, oil, water1.712HBAHDAGas, oil, water1.714HBADanGas, oil, water1120DanHDAInjection water 914HDCHBAGas224HCAHBBGas716HCAHBBOil78HDADanHP Gas912HDADanLP Gas912HDAGormOil & condensate1914Oil export route to shoreHBATyra WestGas2724Gas 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.
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.
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. The capacity of the plant on Halfdan B is: Oil 90,000 BOPD; Gas 125 MMSCFD; Produced water 180,000 BWPD.
Annual production and injection +Halfdan annual oil, gas and water production and water injection 1999-2013Year199920002001200220032004200520062007200820092010201120122013Oil production, 1000 m322211202365371843524346600060855785532654655119490546174150Gas production, million normal m33717852275911421449258229482675310434012885234317091389Produced water, 1000 m3562374933676122099282534604086476648145519614961396099Water injection, 1000 m3621364925325162575997101102612107127271148511945122771091210921 +Halfdan annual oil, gas and water production and water injection 2014-22Year201420152016201720182019202020212022Oil production, 1000 m3367433452780270023852084173314981433Gas production, million normal m3130913341191120912031008924844808Produced water, 1000 m3657473446709731571907421687968587452Water injection, 1000 m3114031076085551003283168823895787168513
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.
It has been estimated that the field will remain economically viable until 2035.
See also
Skjold oil field Gorm Field Tyra field Dan oil field Siri, Nini and Cecilie oil fields Valdemar oil and gas field South Arne oil and gas field Harald gas field Ravn oil field
References