Operation on the J-structure started at 23:15 CET on Wednesday, and oil production began on Thursday.
The J-structure has been built as a satellite of the Oseberg South platform and consists of a well template on the seabed seven kilometers south west of the platform.
The production stream amounting to about 25,000 barrels of oil per day will be transported in an eight-inch pipeline to the processing facility on the Oseberg South platform. An equivalent pipeline will be used for injection of water into the reservoir.
"We should actually have started production from the J-structure last October, but due to the rig lockout and problems with the production well J-12 we have been seriously delayed," says project manager Norodd Hjelmeland.
"Now now production has finally begun. We're using production well number two, J-14, to begin production. Plateau-production of about 25,000 barrels per day will be reached when both wells come into production," says Hjelmeland.
The semisub Bideford Dolphin will continue its drilling program until the winter. In this period the rig will drill an exploration well in the J-centre, a branch on J-12 and two wells for water injection.
"If the exploration well results in a commercial find, it can be converted to a production well and be connected to the template on J-structure. The template has six well connections, and we are currently only using four, so we can still connect new resources nearby," says Hjelmeland.
Field manager Tom Gustavsen at Oseberg South is glad that production from the J-structure has begun.
"We have been waiting a long time for the startup, due to the delays with the lockout and the problems with well J-12. The J-structure production will mean that the process facility on Oseberg South will be far better utilized," says Gustavsen.
Partners at Oseberg South are Norsk Hydro as operator with 34%; Petoro with 33.6%; Statoil with 15.3%; Total with 105; ExxonMobil with 4.7% and ConocoPhillips with 2.4%.
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