OFFSHORE EUROPE
Off the west coast in the Porcupine basin, UK-based Chyrsaor Holdings has farmed into 30% of the Providence-operated gas-liquids field Spanish Point. Chyrsaor will fund a planned program of 3D seismic acquisition, which could lead to drilling of up to two appraisal wells.
Jordbaer result warrants further wells
BG Norge’s Jordbaer oil find in the Norwegian North Sea is “significant”, according to partner Revus Energy, and could lead to further discoveries in the area. Well 34/3-1S, drilled by the semisub Bredford Dolphin in 400 m (1,312 ft) of water, northeast of the Snoree field, encountered a light-oil column in the Jurassic Cook formation.
The structure comprises two main segments, Jordbaer East and Jordbaer Central. The well was drilled into the central segment to a TVD of 4,057 m (13,310 ft), and during a subsequent production test flowed at 7,500 b/d of oil. Production rates and reservoir quality were better than expected, said Revus, although the wellbore did not find the oil-water contact. A side track was planned into the central fault compartment to aid assessment of in-place reserves.
Revus believes the results have de-risked nearby exploration prospects such as Plomme to the north and Blaabaer to the west. It expects further drilling in this area during 2009.
Satellites boost Britannia throughput
ConocoPhillips has brought onstream its Britannia Satellites development in the UK Central North Sea. Callanish, an oilfield in blocks 15/29b and 21/4aN, and Brodgar, a gas/condensate field in block 21/3a, both are tied back to a new platform (BLP) bridge-linked to the Britannia complex which started production in 1998.
Callanish, which comprises two accumulations, has been developed via four subsea horizontal wells exporting oil through a 25-km (15.5-mi), 12-in. (30.4 cm) pipeline. On arrival at the BLP, fluids undergo partial separation before transferral to Britannia for additional processing, and commingling with Britannia’s condensate.
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The Britannia Satellites bridge-linked platform (left) with Britannia on the right. Photograph courtesy of ConocoPhillips UK.
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Brodgar produces through two subsea horizontal wells and is tied back to the BLP through a 41-km (25.5-mi), 12-in. line. This undergoes continuous monoethylene glycol injection to avoid hydrates formation. Fluids are partly separated again at the BLP, while the gas is commingled on the Britannia platform for delivery through the SAGE trunkline to St. Fergus.
According to field analysts Britboss, start-up was originally scheduled for early 2007, but the project suffered delays related to commissioning of the BLP. The jacket and topsides, built by Heerema at its yards in Vlissingen and Hartlepool, UK, both were installed by the crane barge Thialf in August 2006. Acergy’s Seaway Falcon laid the pipelines, while Aker Kvaerner Subsea provided the subsea controls.
Britboss estimates the Callanish/Brodgar reserves at 55 MMbbl of oil and 75 MMboe of gas/condensate. It adds that the Alder, Enochdu, and Finlaggan accumulations are under consideration for a second-phase development.
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Volume 68 Issue 9
September 2008
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