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Dorado Field FEED Flow Assurance

Dorado Field FEED Flow Assurance

Benefits
The steady state and transient flow assurance results defined a range of FPSO and WHP topsides process design requirements, including liquids surge data for separator sizing, flowline depressurisation data for defining the flare system’s requirements, and production chemical requirements for the FPSO and the WHP. The work also defined a range of integrity limits for the subsea system and topsides piping.
Background
The Dorado development is located within the Bedout Sub-basin, some 150 km north of Port Hedland, Western Australia. The Dorado field is planned to have a not-normally-manned (NNM) wellhead platform (WHP), tied-back to a Floating Production, Storage, and Offloading (FPSO) facility, via a 90 m deep system of subsea flowlines and risers.
Work Performed by Atteris

Steady State Parametric Analysis:

Thousands of steady state cases provided key operating data and system insights which were required to finalise the development’s FEED designs. Data from the cases included:

  • Operating temperatures and pressures
  • Liquid holdup volumes
  • Erosional velocity limits, and estimated erosion amounts throughout the system
  • Production and gas injection systems’ deliverability curves
  • Minimum turndown rates to prevent a range of FA issues

Transient Flow Assurance Analysis:

A large number of transient analyses defined the transient behaviours of the system, including:

  • Commissioning and start-up sequences to avoid minimum design temperature exceedances, and to optimise chemical dosing volumes
  • Transient liquid surge sequences to define liquid volumes at the FPSO
  • Flowline depressurisation sequences to support the Insulate and Blowdown hydrate management strategy (including FPSO restriction orifice sizing to prevent excessive flexible riser depressurisation rates)
  • Gas injection system transient cases, defining the behaviour of the near-critical fluids in the gas injection flowline and wells.
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