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3D model of oil facility The facility up close Babbage platform, offshore upstream oil facility

Offshore upstream

Mott MacDonald has been involved in offshore oil and gas since the early days of the development of the UK North Sea and now has experience in all the major areas of offshore production including benign and harsh environments, shallow and deep water, floating facilities, fixed facilities, subsea and pipelines. 

For offshore facilities our expertise ranges from compiling a definitive database on pipeline loss of containment incidents for UKOOA, the Institute of Petroleum and the HSE to comparative risk assessment of failures and impact of fires and explosions on platform structures.

We are involved with all phase of projects from concept identification and selection, through concept definition FEED and detail design to fabrication, transportation, installation and commissioning. We are also involved in production optimisation, brownfield modifications, end of life operations and abandonment.  

We have an excellent understanding of all produced fluids light and heavy oils, dry and wet gas, gas condensate and contaminants such as carbon dioxide, hydrogen sulphide, inerts, produced water and heavy metals.

We have experience in working a variety of regulatory regimes and carry out a safety and environmental assessments.

Identify phase

A clear concise process to establish the preferred concept for new offshore developments or enhancement of existing operations is essential to give confidence to stakeholders that the correct option(s) has been selected and that the risks have been identified and qualified or quantified. The structured process ensures projects easily pass the relevant approval gates to move into define and implement phases.

We have a proven structured process which considers items such as include:

  • Field data including (fluids, profiles, wells)
  • Subsurface and drilling interfaces
  • Environment
  • Existing infrastructure
  • Facilities options (subsea, fixed, floating)
  • Flow assurance
  • New technology
  • Contracting strategies
  • Fabrication, transportation and installation
  • Future abandonment
  • Schedule and costs
  • Regulatory requirements
  • Local content

Key examples include:

Providence Resources, Barryroe Field, Ireland. Where our structured approach to assessment and definition of surface facilities, drilling locations, pipelines and use of existing infrastructure has allowed a waxy crude field to be moved towards the next phase of development.

Viking Energy, Isis Field Redevelopment, Tunisia. Long term delivery of subsea equipment was incompatible with the project schedule but hard soil conditions would require difficult and high cost installation of wellhead platforms. We were able to find and inspect suitable pre-owned subsea equipment that would allow the fast track schedule to be achieved.

Setanta Energy, Roussette Field, Gabon. Where a drilling rig installed platform and mechanically jointed line pipe avoid the need for mobilisation of high cost construction vessels by providing an alternative low cost option.   

Define and implement phases

We are experienced in providing pre-FEED, FEED and detail design services for offshore projects. We have multi-disciplinary teams in that work with international and indigenous oil companies. 

For implementation we provide project management and procurement services or can undertake EPCM projects. Our project management teams work as both separate project management consultants or as integrated teams with the client. We have a long track record of developing project implementation plans and establishing contracting strategy.

We have undertaken many implementation projects for the ADNOC associated operating companies in the UAE.

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