Pickerill and Juliet gas fields

The Pickerill and Juliet gas fields are decommissioned natural gas producing facilities in the UK sector of the southern North Sea. The fields are located about 66 km (41 mi) east of Spurn Head, Lincolnshire. Pickerill was in operation from 1992 until 2018 and Juliet from 2014 to 2018.

Pickerill and Juliet gas fields
CountryUnited Kingdom
RegionNorth Sea
BlocksPickerill: 48/11a, 48/11b, 48/12c and 48/17b; Juliet: 47/14b.
Offshore/onshoreOffshore
Coordinates53°33′0″N 01°04′38″E
OperatorsPickerill: ARCO, Perenco; Juliet: Neptune E&P Ltd
Field history
DiscoveryPickerill: December 1984
Start of productionPickerill: 1992; Juliet: 2014
Abandonment2018
Production
Estimated gas in place16.2×10^9 m3 (570×10^9 cu ft)
Producing formationsRotliegend sandstone

The fields

The Pickerill field was discovered in December 1984 by well 48/11b-4.[1] The field is principally located in Block 48/11a and 48/11b and extends into Blocks 48/12c and 48/17b. The gas reservoir is a Rotliegend sandstone. At the time of start-up, the field was jointly owned by ARCO British Ltd (43.34%), British Sun Oil Co Ltd (23.33%), Superior Oil (UK) Ltd (20.00%), Deminex UK Oil & Gas Ltd (10.00%), and Canadian Superior Oil (UK) Ltd (3.33%).[1] The field was anticipated to have recoverable reserves of 16.2 billion cubic metres.[1]

The Juliet gas field is located to the west of Pickerill in Block 47/14b. It was owned by Neptune E&P Ltd.[2]

Development

The Pickerill field was developed by ARCO by two unattended offshore installations Pickerill A and Pickerill B, with gas transmitted by pipeline from Pickerill A to Theddlethorpe Gas Terminal (TGT), Lincolnshire. The main design parameters of the installations is shown in the table.[3] [2] [4]

Pickerill installations
Platform Pickerill A Pickerill B
Block 48/11b 48/11a
Coordinates 53°33’00”N 01°04’38”E 53°31’30”N 01°09’38”E
Water depth, metres 24 24
Type Steel jacket Steel jacket
Jacket weight, tonnes 500 500
Topsides weight, tonnes 1,200 1,200
Legs, piles 4, 4 internal 4, 4 internal
Well slots 9 9
Production to Theddlethorpe Pickerill A
Gas export pipeline number PL816 PL818
Pipeline length and diameter 62 km 24” 16”
Methanol 3" import pipeline number PL818 PL819
Telecoms tower height, metres 65 65

Gas treatment facilities on the installations were minimal. Normally gas from the wellheads was routed to the production manifold and then to the export line. There was a Test Separator with metering of the individual gas, condensate and water streams. There was a wet well separator for removing water from well fluids. There was also a pig launcher on each platform and a pig receiver on Pickerill A for the Pickerill B to A pipeline.[5]

New pipeline reception facilities and process plant was installed at TGT as part of the Pickerill development.

Perenco assumed ownership of the Pickerill field in 2004.[2]

The Juliet development comprised two subsea wells and their wellhead protection structures (WHPS) producing to a manifold centre.[4]

Juliet installations
Installation Coordinates Water depth, metres Owner
Juliet East WHPS 53.599522 0.808094 55 Neptune
Juliet Manifold 53.601897 0.802000 60 Neptune
Juliet West WHPS 53.599467 0.80507 60 Engie

From the manifold well fluids flowed to Pickerill A via a 22 km long 12” diameter pipeline (PL3121). Reception facilities (the Juliet Emergency Shutdown Valve and a temporary pig receiver) at Pickerill A were located on a sub-cellar deck. Fluids were routed to the export line to TGT. Juliet was controlled from Pickerill A via a control umbilical.[2] [3]

Pickerill A and B were both unmanned and controlled from the Bacton Control Room.[2]

Production

The production profile, in mcm/y, of the Pickerill field was as shown.[3]

The cumulative gas production from Pickerill from 1992 to the end of 2014 was 12,315 million cubic metres.[3]

Decommissioning

The Theddlethorpe Gas Terminal closed in August 2018.[6] Gas export from Pickerill and Juliet ceased and the installations were shut-down. Subsequently their wells were plugged and abandoned and all structures above the seabed were removed.[7]

See also

References
  1. Department of Trade and Industry (1994). The Energy Report. London: HMSO. pp. 79, 125, 144. ISBN 0115153802.
  2. "Pickerill Alpha (A) and Pickerill Bravo (B) Installations Partial Decommissioning Programme" (PDF). assets.publishing.service.gov.uk. Retrieved 30 November 2021.
  3. "Oil and Gas UK – Field data". gov.uk. Retrieved 30 November 2021.
  4. "Inventory of Offshore Installations". odims.ospar.org. Retrieved 30 November 2021.
  5. Pickerill Flow Diagram ARCO undated
  6. "Conoco ends SNS production as Theddlethorpe reaches end of the line". energyvoice.com. 2018. Retrieved 30 November 2021.
  7. "Pickerill Gas Field Decommissioning". nsenergybusiness.com. Retrieved 30 November 2021.
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