Brigantine, Caravel, Corvette and Shamrock gas fields

The Brigantine, Caravel, Corvette and Shamrock fields are natural gas reservoirs and gas production facilities in the southern North Sea, close to the UK/Netherlands median line. The fields have produced natural gas since 1999.

Corvette gas field
Country	United Kingdom
Region	Southern North Sea
Location/blocks	49/24
Offshore/onshore	Offshore
Coordinates	53.231944N 2.622778E
Operator	Shell
Owner	Shell Esso
Field history
Discovery	1996
Start of production	1999
Production
Recoverable gas	211×10^9 cu ft (6.0×10^9 m3)
Producing formations	Rotliegendes

The fields

The Brigantine, Caravel, Corvette and Shamrock gas fields are located in the adjacent UK Offshore Blocks 49/19, 49/20 and 49/24. Brigantine, Caravel and Corvette follow Shell's convention of naming southern North Sea fields after types of sailing vessels. Brigantine has four gas accumulations designated A-D. The gas reservoirs have the following characteristics.^{[1] [2] [3] [4]}

Reservoir characteristics

Reservoir	Brigantine A	Brigantine B	Brigantine C	Brigantine D	Shamrock	Caravel	Corvette
Block	49/19	49/19	49/19	49/19	49/20a	49/20	49/24
Year discovered	1986	1997	1998	2001	1971	2002	1996
Gas reservoir	Rotliegend						Rotliegend
Gas reserves	280 billion cubic feet or 10 billion cubic metres						211 billion cubic feet

Development

The gas producing capability of the fields was realised through five offshore platforms, their characteristics are summarised in the table.^{[5] [1] [6] [7]}##2 1 3 7

Installation characteristics

Installation	Brigantine BR	Brigantine BG	Shamrock QS	Caravel QR	Corvette CV
Block	49/19	49/19	49/20a	49/20a	49/24
Coordinates	53.442744 2.698202	53.402498 2.656400	53.495192 2.974531	53.542131 3.025706	53.231944 2.622778
Water depth, m	29	29	29	30	29
Owner	Shell	Shell	Shell	Shell	Shell
Type	Fixed steel	Fixed steel	Monotower	Monotower	Fixed steel
Substructure weight, tonnes	360	394	180	270	910
Topsides weight, tonnes	152	162	270	180	970
Production start	2001	2001	2008	2008	1999
Production export (by pipeline) to	Brigantine BG	Corvette CV	Caravel QR	Corvette CV	Leman A complex
Export pipeline, length and diameter	5.4 km, 20”	19.6 km, 20”	4.95 km, 16”	33.3 km, 16”	36.6 km, 20”

Production

Gas production from the fields is summarised in the table.^[1] Gas from these installations flows to the Leman A complex and from there to the Bacton gas terminal.

Gas production

Reservoir	Brigantine A	Brigantine B	Brigantine C	Brigantine D	Shamrock	Caravel	Corvette
Production start	2001	2001	2002	2003	2008	2008	1999
Peak production, mcm/y	639	573	655	35	411	873	1,782
Peak year	2003	2001	2003	2006	2010	2011	1999
Cumulative production, mcm/y	2,673	1,561	2,247	90	1,137	2,568	4,780
End of production	2008	2008	2008	2008			2009

The production profile, in mcm/y, of the Corvette field was as shown.^[1]

See also

• Leman gas field
• Bacton gas terminal
• List of oil and gas fields of the North Sea