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ConocoPhillips (Conoco) Heidrun Water Injection

Heidrun project

Norway Blocks 6507/7 and 6507/8

Landmark: North Sea’s first completion in water depths over 1,150 ft (350 m)

The Heidrun Water Injection subsea system is comprised of two four-slot templates with three injection subsea trees each. The templates are tied back to the concrete TLP production facility by two flowlines and control umbilicals. Two subsea riser bases connect the dynamic riser and umbilical to the seabed flowlines and umbilicals.

The project was executed as an EPC contract. Template design is identical to Statoil’s Statfjord Satellite Project, incorporating field-proven technical solutions. Workover and intervention tooling is utilized through a common tool pool with Statoil and Shell. Delivery time from firm order to offshore installation was 18 months. The project was executed as an EPC contract. In 1995, Statoil took over the operatorship of the field.

  • Six vertical 5"x2" 5,000 psi subsea trees
  • Two water-injection templates tied back to a TLP
  • Tie-in system on templates and riser base
  • Electro-hydraulic control system with umbilical and topside controls
  • UWD-II 10,000 psi 18-3/4" subsea wellhead system
  • Mechanically oriented tubing hanger (metal seals throughout) run with hydraulically actuated tool
  • Remote retrievable choke bridge arrangement
  • Pressure and temperature transducers on subsea tree and downhole
  • Vertical wireline access for production and annulus through tubing hanger/subsea tree
  • Diverless make-up flowline and controls umbilical
  • Multiplexed electro-hydraulic control system
  • ROV interface/override facilities
  • Common workover and intervention tools with Statfjord Satellites Project
  • System integration testing, installation assistance, service and maintenance