Ensign Gas Field

Summary Information

  • Operator: Centrica
  • Country: UK
  • Location: Southern North Sea
  • Production start: 2012
  • Partners:
  • Type: Gas
  • Estimated Reserves:
  • Production Volume:


  • The Ensign field is a gas field which straddles UKCS Blocks 48/14a and 48/15a.
  • It lies approximately 80km from the English coastline and 80km from the UK/Dutch median line.
  • Centricadeveloped the Ensign field by the installation of a Not Permanently Attended Installation (“NPAI”) and drilling/completion of three wells. Two wells were existing appraisal wells and the third was a new subsea well, connected to the NPAI by a new 3km production pipeline.
  • From the option selection process the only practical export option was to route the fluids from Ensign through a new 24km pipeline to Audrey A platform in Block 49/11.
  • At the Audrey A platform the Ensign fluids will be commingled with production fluids from the Audrey fields, before being exported to the ConocoPhillips operated LOGGS platform via an existing 20” pipeline.
  • Gas is then exported from LOGGS to the Theddlethorpe Gas terminal via an existing pipeline.


  • Heerema: Construction of the 1,100 tonnes Ensign platform
  • Seaway Heavy Lifting: Installation of Ensign Minimum Facility Platform
  • Subsea 7:
    • Engineer, procure, install, tie-in and pre-commission 24km of 10" gas and 2" methanol pipelines - connecting the new un-manned Ensign satellite platform with the existing subsea pipelines at the Audrey ‘A’ platform.
    • In addition, Subsea 7 will engineer, procure, install, tie-in and pre-commission 2km of 10” gas pipeline and associated control umbilical connecting the Ensign platform to a new subsea well.
  • KWsubsea: 10" Pipeline with 2" piggyback ~ 22km long with 10" pipeline step-out well ~1.8km long


  • 1998 - Centrica acquired 19% from PowerGen
  • 2011 - Project development approved by DECC
  • 2012 - First gas produced


  • The Ensign field sands have low permeability and well fracturing techniques are employed to improve recoverability.


  1. Ensign Field Development Environmental Statement
  2. UK Oil and Gas Fields by Approval Date
  3. List Of Oil Production Platforms In The UK
  4. Seaway Heavy Lifting Oil And Gas References
  5. KWsubsea Upheaval Buckling And Out Of Straightness Analysis
  6. Centrica strikes offshore deal
  7. Subsea 7 S.A. awarded $60 million contract in the North Sea

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