Seamless pipeline tie-in decommissioning and asset transfer

The project included 46 pipeline tie-in disconnections, recovery of subsea structures and the transport of company-owned assets to shore for storage. Intermoor led the operation, supported by other Acteon business lines.  

From the outset, we provided end-to-end support for the decommissioning campaign, seamlessly coordinating all aspects of the process, including: 

• Marine spread chartering and management to ensure operational readiness and minimise downtime.
• Selection and mobilisation of specialist equipment and tooling tailored to the project’s technical and environmental conditions.
• Deployment of experienced offshore personnel to manage complex subsea operations safely and efficiently.  

We completed 61 subsea cuts in the first phase, 433 subsea cuts in the second phase, with an additional 812 cuts performed from the DSV.  

We proactively adapted to evolving offshore challenges through contingency planning and flexible execution. This ensured the project remained on schedule and that all subsea assets were safely recovered and transported to shore, ready for the next phase of asset transfer and disposal.  

Midway through operations, the customer expanded the scope of work, prompting rapid adjustments to the offshore execution plan, mobilisation of new equipment, and development of revised procedures.   

Our integrated capabilities added measurable value through the deployment of advanced tooling and positioning systems. 

UTEC, Acteon’s Geo-Services business line, supplied surface and subsea positioning systems to ensure accurate asset location and recovery, enhancing operational safety and reducing the risk of rework.  

We used a diamond wire cutter and chop saw cutter for precise, low-risk subsea pipeline cutting, reducing the need for manual intervention, and a remote friction disc cutter system to segment long pipe sections into manageable lengths, improving deck space efficiency and reducing handling time.