OSEBERG

Discovery year
1973
Wellbore
Status
Producing
Business unit

Operator:

Equinor Energy AS

Area:

North sea

Production start:

01.12.1988

Historical investments per 31.12.2016:

94 249 MILL NOK (nominal)

Future investments from 2017:

24 899 MILL NOK (real 2017 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 for Oseberg Vestflanken II in 2016. The facilities at the Field Centre process oil and gas from the Oseberg Øst, Oseberg Sør and Tune fields.

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 now developed, which will be recovered in the future. Injection gas was previously imported from Troll Øst (TOGI) and Oseberg Vest. 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. A new unmanned wellhead platform was installed on the western flank (Vestflanken) in 2017. It will start production in 2018. A new licence-owned mobile Cat-J drilling rig ("Askepott") has been constructed, and will be used for drilling wells in the Oseberg area. The first wells will be drilled 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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