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, we support clients through every phase of decommissioning, from regulatory strategy and feasibility studies to offshore operations and execution. Our 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
• Concept Selection (software aided)
• 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
• Platform and Pipeline
• Decommissioning – Demolition.

Vessel-Based Decommissioning

In today’s decommissioning landscape, energy companies seek flexible, efficient, and lower-cost alternatives to traditional well removal methods. Our marine team delivers a full suite of vessel-based conductor and wellhead severance solutions, designed to reduce vessel time, simplify logistics, and maintain operational control throughout the late-life cycle.

By deploying modular cutting spreads from multipurpose offshore vessels, we perform precise multi-string casing and conductor severance using advanced technologies, including mechanical cutters, abrasive water jet systems, and diamond wire saws.

Internal Cutting Tool for Minimal Footprint and Maximum Efficiency

Engineered for efficiency and control, our system features ultra-robust cut verification mechanisms that ensure complete operational integrity and safety throughout the severance process.
Powered by AI-driven machine learning, the tool continuously optimises cutting performance, reducing time and cost while increasing predictability across diverse well designs.