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A-Fields natural gas fields
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The A-Fields (Audrey, Ann, Alison and Annabel) are natural gas reservoirs and gas production facilities in the southern North Sea; about 123 km east of Spurn Head, Yorkshire. The fields produced natural gas from 1988 to 2016.
The A-fields
The Ann gas field was discovered as early as May 1966 and Audrey in March 1976 but there was limited local infrastructure to transport gas to shore.[1] The Lincolnshire Offshore Gas Gathering System (LOGGS) was commissioned in 1988 and designed to act as a hub and central gas processing, compression and transport facility for the area. Gas from LOGGS was routed to the Theddlethorpe gas terminal.[1]
The Audrey field is located in the UK Offshore Blocks 49/11a and 49/15a. The field was initially developed and operated by Phillips Petroleum Co. Ltd., later ConocoPhillips, then by Spirit Energy.[1] The Ann field is in Block 49/06 and 48/10a and was developed by Phillips, later ConocoPhillips, then by Spirit Energy. Alison in Block 49/11a was originally licensed to Phillips. Annabel was in Block 48/10a and was also originally licensed to Phillips, it was designed to produce gas from the Saturn gas field.[1]
The gas reservoirs in the A-Fields are Upper Leman Sandstone Formation of the Lower Permian Rotliegend Group.[2]
Phillips had assigned the letter ‘A’ to the license; all the prospects were given female names starting with ‘A’.[1]
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Development
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The A-Fields were developed by a number of platforms, subsea structures and pipelines.
The design parameters of the Audrey and Ann production facilities are summarised in the table.[2] [3] [4] [5] [6]
The design parameters of the Alison, Annabel and Ensign production facilities are summarised in the table. [2] [6] [5]
In addition to the gas production pipelines there were also 3-inch methanol pipelines from LOGGS to Audrey A and B and to Ensign. There were also control umbilicals to the subsea wellheads.[3]
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Gas production
A summary of the key gas production data for the A-Fields is shown in the table.[7]
The gas production profile, in mcm/y, for Audrey is as shown.[7]
 | This graph was using the legacy Graph extension, which is no longer supported. It needs to be converted to the new Chart extension. |
Decommissioning
The Alison and Ann fields had reached the end of their economic lives in 2010 and 2012 and were closed-in. Audrey was shut down in 2016. Ensign was still operating but the closure of LOGGS and Theddlethorpe gas terminal in August 2018 closed the gas export route; when no alternative export route was found the Ensign installation was decommissioned.[8]
See also
References
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