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The Birch Field, Block 16/12a, UK North Sea

By
J. Hook
J. Hook
LASMO plc, 101 Bishopsgate, London EC2M 3XH, UKPresent address: Vico Indonesia, Kuningan Plaza, South Tower, JLHR Rasuna Said, Kav C 11-14, PO Box 2828, Jakarta 12940
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A. Abhvani
A. Abhvani
LASMO plc, 101 Bishopsgate, London EC2M 3XH, UKPresent address: CNR Inernational (UK) Ltd, Ranger House, Walnut Tree Close, Guildford, Surrey GUI 4US, UK
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J. G. Gluyas
J. G. Gluyas
LASMO plc, 101 Bishopsgate, London EC2M 3XH, UKPresent address: Acorn Oil & Gas, Ash House, Fairfield Avenue, Staines, Middlesex TW18 4AN, UK, (e-mail: jon.gluyas@acorn-oil.com)
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M. Lawlor
M. Lawlor
LASMO plc, 101 Bishopsgate, London EC2M 3XH, UKPresent address: ENI-LASMO, London Technical Exchange, Bowater House, 68 Knightsbridge, London SW1X 7BN, UK
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Published:
January 01, 2003

Abstract

The Birch Field is an oil field located in Block 16/12a on the UK Continental Shelf (UKCS) and is part of the well- established ‘Brae Trend’. Birch produces an undersaturated volatile oil from the Brae Conglomerate, a locally thick conglomeratic unit within the Late Jurassic Brae Formation. The reservoir was deposited as a small submarine fan in the hanging wall of the main fault bounding the western side of the South Viking Graben. The current estimate for oil in place is about 70MMSTB with expected ultimate oil reserves of 30MMSTB. The field was brought on stream in September 1995 as a phased waterflood subsea development, tied back to Marathon’s Brae ‘A’ platform in neighbouring Block 16/7a. During Phase I the discovery and both appraisal wells were re-completed as two oil producers and one water injection well. Phase II comprised a third oil production well and a second water injection well drilled and completed in 1996-1997. Oil production peaked at c. 28 000 BOPD in the second half of 1996. The field is currently in decline and production in June 1999 was c. 7000 BOPD with a water-cut of c. 40%. Cumulative oil production to end June 1999 was 21 MMSTB and remaining oil reserves are estimated as 9 MMSTB.

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Contents

Geological Society, London, Memoirs

United Kingdom Oil and Gas Fields Commemorative Millennium Volume

J. G. Gluyas
J. G. Gluyas
Acorn Oil Gas Ltd, Staines, Middlesex, UK
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H. M. Hichens
H. M. Hichens
Oil and Gas Directorate, London, UK
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Geological Society of London
Volume
20
ISBN electronic:
9781862393950
Publication date:
January 01, 2003

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