Gjøa - OKEA

Gjøa

Gjøa is an oil and gas field located in the northern part of the North Sea. The Gjøa platform is partly electrified with power from shore with result of low environmental footprint. Gjøa is delivering good results, in large part due to low operating costs. To reduce the decline in Gjøa’s own production, several new ongoing development projects are set to utilize the processing capacity on the platform. Gjøa P1, put on production in February 2021, is a project aimed at extending production in the northern part of the field. In addition, tiebacks are being planned from the Duva discovery located northeast of Gjøa and from the Nova field. Duva is expected onstream in 2021 and Nova is planned for 2022. OKEA has a 12 per cent interest in Gjøa, the operator is Neptune.

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Shares

 
  • Neptune Energy Norge AS
  • Petoro AS
  • Wintershall Dea Norge AS
  • OKEA ASA
Licence Name

PL 153

Location

35/9 - 36/7

Ownership

12 %

Operator

Neptune Energy Norge AS

Development

The water depth in the area is 360 metres. Gjøa was discovered in 1989, and the plan for development and operation (PDO) was approved in 2007. The field is developed with five subsea templates. The Gjøa facilities are partly supplied with power from shore. The Vega and Vega Sør fields are tied-back to Gjøa for processing and further export. Production started in 2010.

Reservoir

The reservoir contains gas above a relatively thin oil zone in sandstone of Jurassic age in the Dunlin, Brent and Viking Groups. The field comprises several tilted fault segments with partly uncertain communication and variable reservoir quality. The reservoir depth is 2,200 metres.

Recovery

The field is produced by pressure depletion. In the southern segments, oil production was prioritised in the first years. Gas blow-down, production of the gas cap, started in 2015. Low pressure production was implemented in 2017.

Transport

Stabilised oil is exported by pipeline connected to Troll Oil Pipeline II, for further transport to the Mongstad terminal. Rich gas is exported via the Far North Liquids and Associated Gas System (FLAGS) on the UK continental shelf, for further processing at the St Fergus terminal in the UK.

Status

The successful start-up of production from the Gjøa P1 project in February 2021 underlines the platform’s position as an important hub and increases total remaining developed reserves at Gjøa by 30%. Good reservoir management has already extended the field life considerably and Gjøa is now set to produce in excess of 100 mmboe more than what was estimated when production started in 2010.