Jackdaw gas field is a large offshore natural gas field which lies in Blocks 30/02a, 30/02d and 30/03a in the central North Sea,[1] 150 miles east of Aberdeen.[2] It is wholly owned by BG International Limited, which has been a part of the Shell Group companies since 2016.[3]
The Jackdaw field is being developed as a 'not permanently attended' platform in a water depth of 78 m, 30 km south east of the Shearwater installation to which fluids from Jackdaw are exported.
The Jackdaw reservoir
The reservoir is in the Upper Jurassic Heather Formation and is compartmentalised into two separate reservoir units. The properties of the reservoir and the fluids are as follows.[4] The Jackdaw field is classified as an Ultra high pressure high temperature (uHPHT) field. Such fields are defined as having a reservoir pressure greater than 12,500 psi, and a temperature exceeding 166 °C.[4]
Fluid production
The Jackdaw wellhead platform (WHP) is a four-leg installation located at 56.90104°N, 2.38076°W.[4] The installation supports four wellheads. No hydrocarbon processing takes place on Jackdaw; the well fluids are sent to Shearwater for processing. The topsides pipework is rated for the full shut-in pressure of the wells. Transfer of fluids from Jackdaw to Shearwater is through a 31 km long pipeline 12-inch internal diameter, 18-inch outside diameter pipe-in-pipe. A pipeline overpressure protection system (OPPS) protects the pipeline from the wellhead pressure.[4]
References
- Shell gives final greenlight to Jackdaw gas project in North Sea Reuters, 26 July 2022, retrieved 8 September 2022^
- Kevin Keane. Greenpeace lodges legal bid to halt Jackdaw gas field in North Sea BBC, 26 July 2022, retrieved 8 September 2022^
- Shell invests in the Jackdaw gas field in the UK North Sea Jul 25, 2022, retrieved 8 September 2022^
- Jackdaw Field Development Environmental Statement retrieved 1 October 2024^