This document is to outline the Offshore Facility Operations Philosophy for a typical offshore development.

The primary objectives of any offshore operations are to maximize economically recoverable reserves and value whilst:

  • Operating in a safe, efficient and environmentally responsible manner
  • Minimizing life cycle cost over the development
  • Maximizing facility availability

One of the offshore infrastructure is the FPSO including the vessel, mooring system and topsides process equipment that typically owned by the FPSO Contractor (e.g. MODEC, SBM). Subsea equipment including risers and umbilicals typically owned by Operating Company (e.g. Chevron, CNOOC, TOTAL, etc.).

The modern offshore facility should be a fit for purpose FPSO which typically classified under a Classification Society Rules and will be maintained in Class and Flagged throughout the life of the field. A subsea gathering system will be used to route well stream fluids to and from the FPSO for processing or disposal. Future expansion, including export of surplus gas to shore, tie-in of nearby fields or infill drilling may occur periodically throughout the operating phase.


The Field Manager is responsible for ensuring operation of the facility and delivery of services in line with the FPSO Operations & Maintenance Contracts. The Production Engineer, Operations Engineer and Subsea Engineer support operation of the wells and subsea equipment to optimize reservoir offtake, including ensuring compliance with the reservoir management requirements and subsea operating procedures.

The FPSO Contractor onshore organization supports the FPSO Operations and Maintenance activities in compliance with the Operations & Maintenance in Country Contract (where the field is being developed). Other FPSO Contractor offices located outside of the host country may provide specialist support in compliance with the Operations & Maintenance Out of Country Contract. Additional support to manage the subsea infrastructure, wells and reservoir, and other functional support will be provided by Operating Company main offices.

Third party logistics contractors provide marine support, personnel transfer, materials expediting and warehousing, and waste management services via the FPSO Contractor.

FPSO Organization

The FPSO Contractor will own and operate the FPSO facility. The FPSO Contractor is responsible for all supporting operations on board the FPSO and all facility maintenance.

The FPSO Contractor Offshore Installation Manager (OIM) will be the Person in Charge of the offshore facility at all times. The OIM takes overall responsibility for all activities in the field, ensuring the technical integrity of the asset by correct application of the Management System, and ensuring all legislative requirements relevant to the FPSO are met.

FPSO Contractor staffing will be sufficient to provide manpower for all routine operations and maintenance, such that technical integrity is assured and overall product export availability is optimized. Additional competent contract labor will be utilized for shutdown, campaign and specialist maintenance activities including inspections.

Medical support and health, safety and environment support on the facility will be provided by the FPSO Contractor.


Maintenance strategies for the FPSO equipment and/or systems should be developed by the FPSO Contractor based on front line and campaign maintenance. Maintenance strategies must consider the reliability and availability targets of the equipment/system, the business requirements, legislative requirements, performance requirements, execution synergies with nearby equipment and execution constraints.

Maintenance planning will form an integral part of the operational plans. Maintenance plans should be developed by the Contractor Maintenance Management System and supported by detailed inspection plans where applicable.

Subsea Inspection, Monitoring, Maintenance and Repair

Maintenance strategies for the subsea systems and wells should be developed by Operating Company. Subsea inspections should be conducted by Operating Company at a frequency to be determined by a risk analysis and in line with safety and environmental regulations. Subsea inspection, monitoring, maintenance and repair campaigns should be aligned with planned maintenance where possible to minimize the production impact of required outages.

Integrated Planning

Integrated Activity Plans should be developed to deliver a clear picture of significant activities on the facility and within the field, and enable optimization and efficient use of resources. Integrated Activity Plans should include the Short Term Plan (120 day plan), the Medium Term Plan (2 year plan) and the Long Term Plan (5 year plan).

Planning review and update should be conducted on a formal schedule consistent with the individual plan horizon.

Management System

The Management System should comprise of the procedures, plans, guidelines, instructions and other information required to safely operate and maintain the plant and assure integrity throughout the life of the asset. Where required, bridging documentation should be used to ensure interfaces between the management of Operating Company owned equipment and Contractor owned equipment, or equipment the FPSO Contractor is responsible for under the Operations and Maintenance Contracts, are clear.