Conceptual Design

 Chevron Nigeria Nsiko

Preliminary design and evaluation of full-field development scenarios for three deepwater discoveries

  • Topsides HYSYS simulation / heat and material balances / equipment sizes and weights
  • Flowline routing governed by seabed features and geohazards
  • Transient and steady-state flow assurance
  • Extended tieback calling for specific flowline insulation system and operational procedures

Focus of study

  • Demonstrate technical and commercial feasibility using “conventional technology”
  • Impact of segregated vs. common process trains on host FPSO on CapEx
  • Impact of stand-alone host vs. tieback on CapEx
  • CapEx estimation and commercial software tool calibration

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Chevron Nigeria Area 2

Preliminary design and evaluation of full-field development scenarios for four deepwater prospects 

  • Details as per Area 1 study

Focus of study

  • CapEx estimation
  • Impact of stand-alone host vs. tieback vs. leased FPSO on CapEx
  • Impact of dry tree vs. wet tree on CapEx

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Chevron Nigeria Condensate and Gas Field Development

Preliminary design and evaluation of different scenarios for one deepwater condensate discovery and one dry gas discovery:

  • Flowline routing governed by seabed features and geo-hazards
  • Ultra-long distance tieback to shore-based LNG plant (>100km)
  • Topsides HYSIS simulation/ heat and material balances/ equipment sizes and weights
  • Transient and steady-state flow assurance

Focus of study:

  • Demonstrate technical and commercial feasibility using “conventional” technology
  • Feasibility of ultra-long tiebacks
  • Impact of condensate reservoir depletion versus cycling on CapEx
  • Economics of C3, C4 extraction
  • Impact of dry tree versus wet tree on CapEx
  • Impact of co-development versus phased development

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Chevron Nigeria Deepwater Parametric Study Phase 1 and 2

  • Conceptual design of two development scenarios, with varying design parameters:
    • Stand-alone base case (FPSO)
    • Remote tieback base case
  • Focus of Phase 1 study:
    • Understand CapEx sensitivity to different design parameters
    • Identify “critical” variables
    • Create more accurate design tool for rapid cost estimating
  • Focus of Phase 2 study:
  • Develop CapEx estimating curves for two “base case” development scenarios over a range of key variables
  • Develop Que$tor calibration curves

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Chevron Angola Block 14 – Negage

  • Concept feasibility study for deepwater discovery
  • Eight development scenarios included infield FPSO scenarios, long-distance tiebacks to third party host facilities in adjacent blocks, and co-development / phased development
  • Innovative concepts for hydrate management developed for single production flowline options
  • Variance in water depths and subsea layouts at potential host locations led to different riser solutions, including flexible pipe with integrated gas lift tubes and free standing PIP risers
  • Scope
    • Field architecture
    • Flow assurance / field operability
    • Flowline specification (size and insulation)
    • IPB & SHR definition / quotation
    • Topsides host interface requirements
    • Capital cost and schedule estimates
    • Installation assessment

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Chevron Angola Block 14 – Negage Seafloor Processing

  • SFP assessment of new deepwater discovery to evaluate potential cost savings for subsea equipment and reduce tieback host processing and interface requirements
  • Two options studied for tieback of two drill centers to an adjacent block for production to an OBO host (FPSO)
    • utilizing single production flowline with wet insulation and multiphase pump instead of looped pipe-in-pipe system
    • similar to first but incorporating subsea separation with produced water reinjection to further reduce flowline CapEx and produced water treating at the host
  • Scope
    • Field architecture
    • Subsea separation equipment definition
    • Multiphase pump requirements
    • Flow assurance / field operability
    • Flowline specification (size and insulation)
    • Topsides host interface requirements
    • Capital cost and schedule estimates
    • Installation assessment

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PetroVietnam Exploration & Production – Dai Hung

  • Subcontractor to Berwanger for subsea work scope
  • Evaluated impact of PVEP’s proposed expansion plans for Dai Hung field on existingsemi-submersible host
    • Calculated future riser and topsides loads and impact on global stability, and developed ballasting arrangements to maintain desired stability safety margins
  • Field architecture, flow assurance, installation planning, and capital cost estimating for all host facility alternatives
    • Subsea wells tied back to existing semi host
    • Subsea wells tied back to FPSO host that replaces existing semi host + FSO
    • Subsea wells tied back to fixed platform; production via pipeline to existing semi host

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Rialto Gazelle Field Development

  • Greenfield oil & gas development offshore Cote d’Ivoire
  • Fast track schedule
  • Development concept identification and evaluation of fixed and floating alternatives
  • Fixed facilities & export pipelines Pre-FEED

Total – Gotcha
Full-field development concept screening study for GOM discovery

Shell – Osprey
Subsea development alternatives evaluation for Malaysia discovery

Shell – Perdido
SS distribution hardware transport/installation study for GOM discovery

ENI – Greater Longhorn Area
“Building block” estimates for SS tiebacks to central host in GOM

Shell – Nigeria Bonga South West FPSO
Alternate riser concept evaluation for Nigeria discovery

Devon – Ghana, Keta Block
Phased development screening study for mulitple fields

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