Åsgard Subsea Gas Compression

Norwegian Petroleum Directorate

• The Norwegian Petroleum Directorate (Norwegian: Oljedirektoratet) or OD is a Norwegian government agency responsible for the regulation of the petroleum resources on the Norwegian continental shelf. Based in Stavanger, it is to ensure that the petroleum resources are allocated in an optimal at the same time as they incur minimal environmental impact. It is subordinate to the Norwegian Ministry of Petroleum and Energy.

• Remember:– PDO: Plan for Development and Operation of a petroleum deposit.– PIO: Plan for Installation and Operation of facilities.– Website: http://www.npd.no/– http://www.norskpetroleum.no/

Norwegian Sea, North Sea and Barents Sea

World’s oil exporters

Norway oil production and consumption

Åsgard Subsea Gas Compression System

Owners

Introduction to Haltenbanken

Haltenbanken area

• The Haltenbanken area in the Norwegian Sea contains a number of challenging oil and gas fields that require advanced technology for improving the oil recovery.

• Haltenbanken is located at the west of Trøndelag in the Norwegian Sea, is an interesting area for both production and exploration.

• First production from Haltenbanken started in 1995.

• The Haltenbanken operations in Stjørdal.

Haltenbanken area

• At Haltenbanken you find the following fields in production:

• Heidrun• Åsgard including Smørbukk, Smørbukk Sør and

Midgard • Kristin• Tyrihans• Morvin• Mikkel • Njord

Introduction to Åsgard

• The Åsgard field lies on the Halten Bank in the Norwegian Sea, about 200 kilometres off mid-Norway and 50 kilometres south of Heidrun.

• The Åsgard A operated from 1999.

• Åsgard B platform began on 1 October 2000.

• The Åsgard field comprises the Midgard, Smørbukk and

Smørbukk South discoveries.

• Åsgard ranks among the largest developments on the Norwegian continental shelf, embracing a total of 52 wells drilled through 16 seabed templates.

• The Åsgard field is located in the Norwegian Sea about 260 kilometers west of Brønnøysund. The field has been developed with the Åsgard A installation (production ship) for production of oil and condensate. The gas is produced from a floating installation (Åsgard B), while the condensate is stored on the Åsgard C (storage ship).

Introduction to Åsgard

• Crude oil, condensate and gas are produced from Åsgard. Crude oil and condensate are mixed to form a light oil called Åsgard blend. The liquid is pumped from storage tanks into shuttle tankers which sail between the fields and the different refineries.

• Gas from Åsgard is piped through Åsgard Transport to the Kårstø processing complex, north of Stavanger. The heavier components, such as ethane, propane, butane and naphtha are separated out at Kårstø. The dry gas is piped to continental Europe.

• Åsgard supplies about 11 billion cubic metres of gas annually to European customers.

Introduction to Åsgard

Transport:• The Åsgard development links the Halten Bank area to Norway's gas

transport system in the North Sea, putting long-standing plans for a pipeline connection into effect. Growing demand for Norwegian gas from continental Europe has made this possible, and Åsgard will help to meet the planned expansion in Norway's gas exports.

• Gas from the field is piped through the Åsgard Transport line to the treatment plant at Kårstø north of Stavanger and on to European customers.

• Oil produced via the A vessel is shipped from the field by shuttle tankers.

Introduction to Åsgard

Åsgard Subsea Gas Compression

• The Midgard and Mikkel gas reservoirs in the Åsgard field have been developed as subsea field installations. The wellstream from both fields, which are located 50 and 70 kilometres away respectively, is sent in the same pipeline to the Åsgard B platform.

• Analyses show that towards the end of 2015 the pressure in the reservoirs will become too low to avoid unstable flow and maintain a high production profile to the Åsgard B platform. Compression is necessary to ensure a high gas flow and recovery rate.

• The technology will increase recovery from Mikkel and

Midgard by around 282 million barrels of oil equivalent.

• The subsea gas compression technology will boost falling gas pressures from Åsgard’s two subsea satellites, Midgard and Mikkel. The system will allow stable production to continue and enable an additional 280 million barrels of oil equivalent to be recovered.

• A dry gas compressor system will be used on Åsgard. Gas and liquids are separated before boosting. The liquid is boosted by a pump and the gas by a compressor. After boosting, gas and liquids are mixed into the same pipeline before transport to Åsgard B.

Åsgard Subsea Gas Compression

Useful links

• https://www.youtube.com/watch?v=GIu8U3XHXpE

• https://www.youtube.com/watch?v=Ew1h9aU4odo.

• https://www.youtube.com/watch?v=5z_eIjYHyx0.

• https://www.youtube.com/watch?v=N50TLEAeVwA.

• https://www.akersolutions.com/en/Global-menu/Projects/Subsea-technologies-and-services/System-engineering/Aasgard-subsea-gas-compression/

• https://www.akersolutions.com/en/Global-menu/Media/Feature-stories/Subsea-technologies-and-services/Asgard-subsea-gas-compression-system/

• http://www.statoil.com/en/TechnologyInnovation/FieldDevelopment/AboutSubsea/Pages/The%C3%85sgardComplex.aspx

• http://www.statoil.com/en/NewsAndMedia/News/2015/Pages/09Jun_Aasgard_subsea.aspx

Useful links