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Dorado SURF Pre-FEED

Dorado SURF Pre-FEED

Benefits
Atteris, in close collaboration with Santos, successfully identified suitable riser configuration options for the Dorado dynamic riser system. Relevant key drivers were also communicated in a timely manner to feed into the FPSO design competition performed in parallel. Preliminary on-bottom stability checks were performed for the flowlines and static umbilical.
Background
The Santos Dorado field is located 150 km north of Port Hedland, Western Australia, within approx. 90 m of water. Development of the Dorado field comprises a floating, production, storage and offloading vessel (FPSO) with a Well Head Platform (WHP) connected via subsea production and injection flowlines, risers and umbilical. The 5 dynamic risers and umbilical connect to the FPSO via an internal Disconnectable Turret Mooring (DTM). Preliminary work was performed during the previous phase based on a tethered wave riser configuration. Santos engaged Atteris to perform a comparative assessment between Lazy Wave, Tethered Wave and Lazy S riser configurations, and provide early indication of the anticipated requirement for secondary stabilisation on the flowlines and static umbilical. Field layout definition and refinement of the WHP platform connection was also required.
Work Performed by Atteris

Atteris performed the following activities:

  • Dynamic Riser and Umbilical configuration screening study: Comparative assessment of Lazy Wave / Weighted Lazy Wave, Tethered Wave and Lazy S considering technical feasibility, HSE and Capex/Opex aspects.
  • On-Bottom Stability Assessment for the 5 flowlines and static umbilical. Atteris used their extensive stability tools and experience to provide valuable results on an efficient timeline and budget.
  • Field Layout Definition including FPSO and WHP approaches. Atteris demonstrated their expertise by challenging the WHP orientation and the rigid riser option considered in this phase of the work.
  • FEED documentation preparation to assist with the next phase of the project.
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