Chevron Alder Jumper Spool

Project description
In 2014, Chevron Upstream Europe (CUE) started developing the High Pressure High Temperature (HPHT) Alder field in the Central North Sea. Alder is a gas condensate field which produces through a single subsea well in 152m of water. There is a requirement to inject methanol within the tree and wellhead tie-in spool downstream of the tree, leading to a requirement for a high pressure well jumper (12,500 psi). Strohm has been contracted to supply the high pressure flexible TCP Jumper, connecting the manifold with the tree.

Client  (Chevron) conclusions & lessons learned, February 2017, Subsea UK

  • Successful installation of world's first Thermoplastic Composite Pipe (TCP) in a permanent installation subsea worldwide
  • Pipe in operation since 1 November 2016
  • Successful joint effort involving Chevron, Strohm, Technip and Flowline Specialists
  • Product more robust in handling than expected
  • Installation from subsea carousel worked well
  • Product weight vs stiffness managed during installation
  • Involvement and input of Strohm at interface trials and transpooling key for success
  • Concrete protection mattresses worked well for short length of TCP on seabed

Key system characteristics

  • De-risking project schedule
  • Manufactured in advance, terminated prior to installation on site
  • Significantly more tolerance in length than rigid pipe
  • Can be deployed using subsea pallet
  • No metrology required, faster first oil 

Lowest total installed cost

  • Reduced fabrication cost
  • Reduced buoyancy cost
  • Reduced transport costs
  • Reduced installation costs