Cascade/Chinook Field

Cascade/Chinook Field – Petrobras America (Oil, Gulf of Mexico)

The Cascade/Chinook fields are deepwater, Lower Tertiary oil discoveries that will be developed with the Gulf of Mexico’s first FPSO. Cascade/Chinook will be produced via dual flowline subsea tiebacks, as well as subsea boosting on each of the flowline loops to enhance production recovery.

Our team of consultants determined the required fluid testing necessary to properly characterize lower tertiary oil development. We coordinated basic chemistry testing with PVT labs for tests, including emulsions, asphaltenes, and waxes. In addition, we coordinated chemical inhibition testing and interpretation of results to address key flow assurance issues.

We performed a conceptual study to validate the subsea and topside system configuration for an ultra-deepwater development (Cascade/Chinook). Steady state and transient analyses were performed over a range of operational scenarios, including early-life (minimal wells / single flowline) and full-field development (multiple wells/dual flowlines). Chemical inhibition requirements, subsea boosting requirements, and general operating guidelines were developed throughout expected field life.

Steady state and transient analysis for a gas pipeline from FPSO to subsea tieback were performed to evaluate the hydraulics of heavy gas swinging between dense phase and multiphase regions. Liquid drop out and total liquid inventory during steady state and transient operations were evaluated including feasibility of production/pigging at very low flowrates, initial commissioning, pipeline dewatering with N2, back depressurization into a FPSO, throttling to control overall system pressure, and phase behavior.

Key Features

  • Fluid testing
  • Production chemistry issues: emulsions, asphaltenes, and waxes
  • Chemical inhibition screening
  • Ultra-deepwater development
  • Early-life operations
  • Full-field operations
  • Subsea boosting requirements
  • General operating guidelines
  • Hydraulic analysis on gas line from FPSO to subsea tieback
  • Changes in gas phase from dense phase and multiphase regions
  • Liquids management
  • Initial commissioning
  • Pipeline dewatering with nitrogen
  • Back depressurization into an FPSO
  • Throttling for control of overall system pressure