Case Study

FPSO Decommissioning

Project description

PDi were engaged by ConocoPhillips to support the planning and execution of decommissioning the MacCulloch FPSO and associated subsea infrastructure prior to installation contractor involvement.

Support was required to identify and assess the potential disconnection and removal options for the FPSO, moorings and subsea infrastructure. PDi developed the necessary engineering studies and decommissioning methodologies which were subject to Peer and Operational reviews before being developed into detailed offshore procedures.

These procedures were then transferred to the nominated installation contractor to be adopted, risk assessed and finalised. At this point the PDi project team assumed management of the installation contractor both on and offshore on behalf of ConocoPhillips.

Our Scope

The detailed scope included the following aspects:

  • Assess removal options
  • Develop decommissioning methodologies
  • Specialist equipment selection
  • Develop decommissioning procedures
  • Recovery analysis
  • Structural integrity / lift points assessment
  • Rigging design
  • HIRA support
  • FPSO interface support
  • Management of installation contractor
  • Offshore engineering representative support

In addition, PDi also provided the following support for development of the Decommissioning Programme:

  • Option Selection Study including methodology development and cost modelling
  • Technical Feasibility Review
  • Pipeline and Mattress Historical Review
  • Pipeline Degradation Study
  • Comparative Assessment Support





March 2014 (12 months)

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