Perth plans laid out

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Offshore.no International » News » Field development

Posted 02.02.2012 12:04:21 av John Bradbury

Development of the UK Perth field is set to be achieved using a converted tanker the Lewek Victory which is to be supplied by EMAS Offshore and converted to an FPSO.

Detailed plans for development of the UK North Sea Perth field have been laid out by project operator Deo Petroleum which

Current planning is is for fabrication installation and commissioning of new facilities early this year with drilling to start in the third quarter 2013 and first oil by mid 2014.

Perth was discovered with the 15/21a-7 well drilled in 1983 and tested oil from Upper Jurassic Kimmeridge Clay sands. .Further appraisal took place in with three wells drilled by Hess, between 1992 and 1997 and the wells tested at between 1,000 to 6,000 b/;d of oil but with a high content of H2S sour gas.

Deo indicates in an environmental statement on the project that the FPSO will be bow-moored with a turret and will offload to shuttle tankers.

Furthermore, Deo indicates that it has selected the Lewek Victory, a converted tanker, to become the Perth FPSO, a 94,255 dead-weight tonne unit, which is due for installation in 2014.

Perth lies in UK blocks 15/21a and 15/21c in the UK Central North Sea and the field is divided into five main compartments with an east-west fault north of the three appraisal wells and a north-south fault between those wells and the original discovery well.

The five field areas comprise North-West Perth Terrace, Core Perth Extension, North-East Perth Terrace, Core Perth and East Perth.

Oil in place is estimated at 23,375,000 tonnes (147 million barrels) with estimated technical recoverable reserves put at between 3,657,000 and 5.727,143 m tonnes (23 – 36 m bbls). Perth is estimated to have a field life of 15 years.

Deo is planning a single drill centre with up to six wells – four deviated production wells and two water injectors. Subsea, Deo is planning for up to three additional production wells to be tied in. Gas lift will also be included in the recovery plan.

Deo's environmental statement indicates plans for a central production manifold equipped with multi-phase metering and subsea control modules. There will be four deviated production wells and two water injection wells, and four flexible flowlines, two 8-inch lines for production, a 4-inch gas lift line and one for water injection, plus a control umbilical running east 1.8 km - supported by a mid-water arch - from the drill centre to the Perth FPSO.

Development plans involve a first appraisal well into the Core Perth Extension, north of the 15/21b-49 well, and this then might be sidetracked to the Core Perth area. Three further producers and two water injectors will then be drilled. Total drilling duration is put at 404 days commencing in the first quarter next year and continuing through to the first quarter of 2014.

Process packages on board will be designed for a maximum liquid throughput of 40,000 b/d with up to 30,000 b/d of oil, and water injection rate of 35,000 b/d plus sour gas handling.

Deo has 52.03% field equity, Faroe Petroleum 34.62% and Atlantic Petroleum 13.35%.

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