OSEBERG

Discovery year
1973
Wellbore
Status
Producing
Business unit

Operator:

Equinor Energy AS

Area:

North sea

Production start:

01.12.1988

Historical investments per 31.12.2017:

94 249 MILL NOK (nominal)

Future investments from 2018:

19 460 MILL NOK (real 2018 NOK)

PRODUCTION FROM THE FIELD

Source: The Norwegian Petroleum Directorate

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PRODUCTION FROM THE FIELD

Development

Oseberg is a field in the northern part of the North Sea. The water depth in the area is 100 metres. Oseberg was discovered in 1979, and the plan for development and operation (PDO) was approved in 1984. The field was developed in multiple phases and production started in 1988. The Oseberg Field Centre in the south originally consisted of two facilities: the process and accommodation facility Oseberg A and the drilling and water injection facility Oseberg B. A PDO for Oseberg C was approved in 1988 and included an integrated production, drilling and quarters facility (PDQ) in the northern part of the field. A PDO for the gas phase was approved in 1996 and included a facility for gas processing, Oseberg D. A PDO for the western flank, Vestflanken, was approved in 2003 and included a subsea template tied-back to Oseberg B. A PDO for Oseberg Delta was approved in 2005 and included a subsea template tied-back to Oseberg D. A PDO for Oseberg Delta II was approved in 2013 and included two subsea templates tied-back to the Oseberg Field Centre. A PDO for Oseberg Vestflanken II was approved in 2016 and included an unmanned wellhead platform (UWP), Oseberg H, and new wells from the existing G4 template on the western flank. The Oseberg Øst, Oseberg Sør and Tune fields are tied to the Oseberg Field Centre.

Reservoir

Oseberg produces oil and gas from sandstone of Middle Jurassic age in the Brent Group. The main reservoirs are in the Oseberg and Tarbert Formations, but there is also production from the Etive and Ness Formations. The reservoirs lie at a depth of 2,300-2,700 metres and have generally good reservoir quality. The field is divided into several structures. There are also resources in the Statfjord Group and Cook Formation in the satellite structures west of the main structure.

Recovery

The Oseberg field is produced by pressure maintenance using gas and water injection. Massive upflank gas injection in the main field has provided excellent oil displacement, and a large gas cap has developed. Injection gas was previously imported from Troll Øst (TOGI) and Oseberg Vest. Currently, produced gas is partly exported and partly reinjected. In the future, a larger share of the gas will be exported. Small parts of the field are produced by pressure depletion.

Transport

The oil is transported through the Oseberg Transport System (OTS) to the Sture terminal. Gas export began in 2000. The gas is transported to the market via the Oseberg Gas Transport (OGT) pipeline to the Heimdal Gas Centre and further in the Statpipe-system to continental Europe, and via the Vesterled pipeline to the UK.

Status

The challenge with the main Oseberg reservoirs is to balance oil production with gas offtake. The new unmanned wellhead platform on the western flank started production in 2018. A new mobile Cat J drilling rig ("Askepott"), owned by the licence, started drilling new wells in the Oseberg area in 2018.

ACCRUED INVESTMENTS IN NOMINAL NOK

Source: The Norwegian Petroleum Directorate

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ACCRUED INVESTMENTS IN NOMINAL NOK

NPD's CURRENT RESOURCE ESTIMATES

All numbers in mill. Sm3 o.e.

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NPD's CURRENT RESOURCE ESTIMATES – All numbers in mill. Sm3 o.e.
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OWNERS

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