Halfdan field

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.

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 manned multi-platform bridge-linked facilities. And Halfdan C is an unmanned satellite of the B complex. Key parameters of the installations and platforms are given in the table.

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 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.

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.