Production
Oseberg A is a concrete base platform which includes process equipment and accommodation quarters; Oseberg B sits on top of a steel jacket, and has drilling, production and injection facilities; Oseberg D is a steel platform with gas processing and export equipment which was connected to the Field Centre by a bridge in 1999. Oseberg C is an integrated drilling, accommodation and production platform with a steel jacket. Oseberg Vestflanke was developed with a subsea template tied back to Oseberg B. Oseberg Delta will be developed with a subsea template tied back to Oseberg D. Production from the Gamma Main structure in the Statfjord Formation started in the spring of 2008 with two wells from the Oseberg Field Center. The facilities at the field center process oil and gas from the fields Oseberg Øst, Oseberg Sør and Tune. The Plan for Development and Operation (PDO) for the northern part of Oseberg was confirmed on 19 January 1988. The PDO for Oseberg D was approved on 13 December 1996, for Oseberg Vestflanke – on 19 December 2003 and for Oseberg Delta on 23 September 2005. The oil from the field is produced by maintenance of pressure through gas and water injection and by water gas injection (WAG). Injection gas used for pressure maintenance was previously brought from Troll Øst (TOGI) and Oseberg Vest. Other smaller parts of the field produce by pressure depletion.
The field has been producing since 1 December 1988. Plateau oil production of 81,000 Sm3 per day ended in 1997. Current production (total for 2009 to September) as per stats is 3.788063 mill S m3 of oil, 2.926727 bill Sm3 of gas, 0.462964 mill tonn of NGL
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