Shenzi Field

Shenzi Field – BHP Billiton (Oil, Gulf of Mexico)

The Shenzi field is a deepwater, Miocene oil development, located in the Green Canyon area of Gulf of Mexico. Shenzi is an oil field with a design capacity in excess of 100,000bpd. Shenzi was developed via dual flowline, subsea tiebacks from multiple manifolds to the host facility, relying on gas lift for artificial lift as reservoir pressure depletes over time.

Wood Group Kenny's Process Solutions group performed a steady state and transient analysis to assess the viability of the subsea tieback proposed for the Shenzi field, starting at concept discovery and continuing through start-up of the field in 2009. The analysis was an evaluation of the insulation and line size requirements to address flow assurance for the Shenzi North to the Shenzi manifolds, while also evaluating the impact on the proposed Shenzi system design. Factors considered were back-out potential, erosional velocity requirements, and impact on overall cooldown times.

Our team of experience consultants performed an extensive flow assurance study, consisting of thermal and hydraulic modelling of multiple wells/multiple production loops. We worked with other disciplines to confirm system architecture and worked with the operations team to develop an operational philosophy for the field in order to meet all flow assurance objectives. Scope of study included steady state, cooldown, restart, displacement, flowline preheating, and depressurization so to properly address hydrate/wax issues.

Our consultants performed steady state and transient modelling to select field development concept for an HP/HT field in deepwater GOM. Our team worked as part of an integrated project team to provide input conditions for the pipeline design / subsea layout.

Key Features

  • Insulation type selection
  • Line size requirements
  • Back-out potential
  • Erosion velocity requirements
  • Hydrate mitigation during shut-in
  • Evaluation of multiple production loops
  • Operational philosophy for addressing hydrate / wax issues
  • High pressure/high temperature operations