Decommissioning

From late-life planning to well plug and abandonment and subsea severance, we deliver end-to-end decommissioning solutions built on decades of marine and well engineering expertise.

Together with our sister companies under ABL Group — ABL (the marine operations & offshore consultancy) and Longitude (the design & engineering specialists) — we bring together a unique blend of capabilities to drive safe, compliant, and cost-efficient decommissioning in every basin.

Our teams support decommissioning operators through every phase, from strategic planning and feasibility studies to offshore execution, providing risk-managed solutions that minimise cost, downtime, and operational exposure.

With a proven track record across the North Sea, Asia-Pacific, and Americas, AGR’s approach prioritises safety, environmental integrity, transparent auditability, and cost and risk control, including vessel-based decommissioning methods that reduce mobilisation requirements, minimise OPEX and CAPEX, and increase vessel utilisation across multiple scopes.

By unifying marine assurance, well engineering, and FEED design within one delivery model, we help operators make confident decisions and execute decommissioning projects above and below the waterline — with assured compliance, efficiency, and peace of mind.

Well Plug & Abandonment Expertise

Our well engineering services cover but are not limited to:

• Feasibility / Budgetary / Decommissioning Options Studies
• Well P&A Concept Selection
• P&A FEED
• HAZOP and HAZID’s
• Vendor Selection
• Development of detailed specification tendering
• Bid Reviews
• Managing regulatory submissions
• Installation Engineering Services
• Project Management
• Peer Reviews
• Client Representation.

Vessel-Based Decommissioning Solutions

In today’s decommissioning landscape, energy companies seek flexible, efficient, and lower-cost alternatives to traditional well and offshore infrastructure removal methods. Combining advanced subsea well abandonment tools, specialised subsea infrastucture removal technologies and flexible intervention vessel capabilities, our marine team delivers a full suite of vessel-based decommissioning and vessel-deployed plug and abandonment (P&A) solutions, designed to reduce vessel time, simplify logistics, and maintain operational control throughout the late-life cycle.

We deploy our Multi‑Purpose Vessels (MPVs), equipped with WROVs selected for their ability to operate a wide range of tooling through simple and efficient interfaces, enabling permanent well sealing in full compliance with stringent industry standards, including NORSOK D‑010.

We perform wellhead severance, casing string retrieval, and subsea tree recovery using the modern cutting technologies.

By shifting subsea decommissioning and well P&A work to specialised offshore vessels instead of costly rigs, our clients achieve substantial cost savings while significantly reducing carbon emissions, helping them strengthen their overall ESG performance.