Decommissioning & End of Life
Riser & Subsea Decommissioning
We help operators solve their decommissioning challenges holistically, bridging the gap between operations and decommissioning teams, resulting in significant cost savings and a more efficient transition of activities.
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Removing aged subsea architecture after years of service requires a multi-disciplinary team to carry out the many tasks involved. Our holistic planning approach allows operations to continue right up to cessation of production and results in significant cost savings.
We help solve a range of common decommissioning challenges and do this by applying our thorough understanding of the safety philosophy of industry design codes and prior practical experience of decommissioning. We identify critical components and the key interactions between subsea disciplines and develop appropriate methods for removing obsolete infrastructure safely. Our long track record in equipment detailed design, installation engineering and integrity management can also provide a valuable insight into the requirements for reverse engineering, removal and potential re-use. This has helped clients overcome issues such as a lack of knowledge about equipment condition and time-dependent degradation safety while remaining compliant with the relevant legislation.
For larger projects, we collaborate with other Acteon Group companies combining the specialist skills and technologies of Acteon’s individual service companies to provide innovative and flexible solutions to drive operational efficiency. Working together, particular consideration is made to the interfaces and interaction between activities such as well P&A, subsea recovery and facility removal as much as the challenges of each activity individually.
After working with us, our clients have the tools to help overcome the divide between operational and decommissioning teams as pre-work to facilitate post-CoP activities can be scheduled into work programmes whilst the asset remains on-line. Not only does this generate cost savings but also provides an effective mechanism for managing the risks and challenges through late life operations and into decommissioning.
Planning & Supervision Services
Data gathering and review of historic records
Cost comparisons and concept selection
Holistic field-wide pre-planning studies
Vessel selection and feasibility studies
Feasibility of riser re-use
Scrap yard selection
Reverse installation analysis of risers, flowlines and moorings
Riserless abandonment system design
Selection of cutting tools
Operational procedures and storyboards
Assessment of platforms, manifolds and flowlines
Design and analysis of lifting members and tools
Removal of concrete in piles
Petrofac – Cendor MOPU decommissioning & conductor preparation
PCPPOC – DANA freestanding conductor platform analysis
BP – Foinaven decommissioning efficiencies study