Schiehallion oilfield
| Schiehallion oil field | |
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Schiehallion Vessel 2004
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| Country | Scotland, United Kingdom |
| Region | North Sea |
| Offshore/onshore | offshore |
| Coordinates | 60°20′N 4°20′W / 60.333°N 4.333°WCoordinates: 60°20′N 4°20′W / 60.333°N 4.333°W |
| Operator | BP |
| Partners | BP, Shell, Amerada Hess, Murphy Oil, Statoil, OMV |
| Field history | |
| Discovery | 1993 |
| Start of production | 1998 |
The Schiehallion oilfield is a deepwater offshore oilfield approximately 175 kilometres (110 mi) west of the Shetland Islands in the North Atlantic Ocean. The Schiehallion and adjacent Loyal field were jointly developed by BP on behalf of the Schiehallion field partners; BP, Shell, Amerada Hess, Murphy Oil, Statoil and OMV, and the Loyal field partners; BP and Shell.
The Schiehallion field, together with Foinaven, Clair, Lancaster and Solan fields, forms the frontier area generally termed as the West of Shetland.
Schiehallion field was discovered in 1993 by the semi-submersible drilling vessel Ocean Alliance while drilling the third exploration well in block 204 (well 204-3). The field is located in blocks 204/20 and 204/25 of the United Kingdom Continental Shelf in a water depth of 350 to 450 metres (1,150 to 1,480 ft). Recoverable oil reserves of Schiehallion are estimated to be between 450 and 600 million barrels (72×106 and 95×106 m3).
During 1994 and 1995 an appraisal of Schiehallion and Loyal was carried out, culminating in a successful extended well test, which demonstrated well rates of up to 20,000 barrels per day (3,200 m3/d). The combined development of the Schiehallion and Loyal fields was sanctioned in April 1996 and the oil production started on 29 July 1998.
The design and construction of the Schiehallion FPSO vessel was contracted to the Atlantic Frontier Alliance, an ad hoc contracting consortium consisting of Harland and Wolff, SBM Offshore, and Brown and Root. The vessel was designed as a simple barge form, with a 245-metre (804 ft) length similar to a Suezmax tanker. The contract was placed in June 1995. The vessel was constructed at the Harland and Wolff shipyard in Belfast, and handed over to operator BP on 31 December 1997. The vessel has a dead-weight of 154,000 tonnes (152,000 long tons; 170,000 short tons), a processing capacity of 200,000 barrels per day (32,000 m3/d), and a storage capacity of 900,000 barrels (140,000 m3).
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