Brigantine, Caravel, Corvette and Shamrock gas fields
{{Infobox oil field|name=Corvette gas field|coordinates=53.231944N 2.622778E|country=United Kingdom|region=Southern North Sea|locblocks=49/24|operator=Shell|offonshore=Offshore|owner=Shell Esso|discovery=1996|startofproduction=1999|recover_gas_bft=211|producingformations=Rotliegendes}}
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.
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.{{Cite web|title=Oil and Gas UK – Field data|url=https://www.gov.uk/guidance/oil-and-gas-uk-field-data#uk-production-data|url-status=live|access-date=8 December 2021|website=www.gov.uk|archive-url=https://web.archive.org/web/20151027141611/https://www.gov.uk/guidance/oil-and-gas-uk-field-data |archive-date=2015-10-27 }} {{Cite web|title=The Corvette field|url=https://mem.lyellcollection.org/content/20/1/699|url-status=live|access-date=8 December 2021|website=mem.lyellcollection.org|archive-url=https://web.archive.org/web/20211208155928/https://mem.lyellcollection.org/content/20/1/699 |archive-date=2021-12-08 }} {{Cite web|title=Brigantine field development gets green light|url=https://www.ogj.com/drilling-production/article/17254048/brigantine-field-development-gets-green-light|url-status=live|access-date=8 December 2021|website=www.ogj.com|date=19 July 2000 |archive-url=https://web.archive.org/web/20211208154417/https://www.ogj.com/drilling-production/article/17254048/brigantine-field-development-gets-green-light |archive-date=2021-12-08 }} {{Cite web|title=England's Historic Seascapes: Withernsea to Skegness|url=https://archaeologydataservice.ac.uk/archives/view/ehswithern_eh_2009/brigantine.cfm?CFID=c8920e04-e7b7-42f3-96a5-76d59c98f1c2&CFTOKEN=0|url-status=live|access-date=8 December 2021|website=archaeologydataservice.ac.uk|archive-url=https://web.archive.org/web/20211208154416/https://archaeologydataservice.ac.uk/archives/view/ehswithern_eh_2009/brigantine.cfm?CFID=c8920e04-e7b7-42f3-96a5-76d59c98f1c2&CFTOKEN=0 |archive-date=2021-12-08 }}
| class="wikitable"
|+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
| colspan="4" |Rotliegend | | |Rotliegend |
| Gas reserves
| colspan="4" |280 billion cubic feet or 10 billion cubic metres | | |211 bscf |
Development
The gas producing capability of the fields was realised through five offshore platforms, their characteristics are summarised in the table.{{Cite web|title=Inventory of Offshore Installations|url=https://odims.ospar.org/en/maps/map-inventory-of-offshore-installations-2017/|url-status=live|access-date=8 December 2021|website=odims.ospar.org|archive-url=https://web.archive.org/web/20211125041801/https://odims.ospar.org/en/maps/map-inventory-of-offshore-installations-2017/ |archive-date=2021-11-25 }} {{Cite web|title=OGA interactive Maps|url=https://ogauthority.maps.arcgis.com/apps/webappviewer/index.html?id=adbe5a796f5c41c68fc762ea137a682e|url-status=live|access-date=8 December 2021|website=ogauthority.maps.arcgis.com|archive-url=https://web.archive.org/web/20190126213234/https://ogauthority.maps.arcgis.com/apps/webappviewer/index.html?id=adbe5a796f5c41c68fc762ea137a682e |archive-date=2019-01-26 }} {{Cite web|title=Standardised monotowers|url=https://hsmoffshoreenergy.com/en/projects/oil---gas/platforms/standardised-monotowers/|url-status=live|access-date=8 December 2021|website=hsmoffshoreenergy.com|archive-url=https://web.archive.org/web/20211208154421/https://hsmoffshoreenergy.com/en/projects/oil---gas/platforms/standardised-monotowers/ |archive-date=2021-12-08 }}##2 1 3 7
| class="wikitable"
|+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. Gas from these installations flows to the Leman A complex and from there to the Bacton gas terminal.
| class="wikitable"
|+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.
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