Decommissioning

A unified, specialist approach to abandonment and removal

Our model, supported by the expertise within our partnership, integrates the full range of engineering, severance and removal services needed to simplify late-life delivery. Leveraging our collective capabilities, we continually invest in new tools, cutting techniques and methodologies that enhance safety, minimise risk and improve performance. To enable a dynamic, flexible and client-focused approach, engineering and integration leadership is allocated to the most appropriate partner for each scope.

Where Aquaterra Energy fulfils this role, it provides a single point of engineering authority to define the technical baseline, control interfaces and govern execution. This creates a streamlined, end-to-end pathway through late-life activities, providing an agile, cohesive and cost-effective approach across core decommissioning scopes.

Project engineering and coordination: FEED studies, well access, structural analysis, bespoke engineering and full project management, ensuring seamless execution from planning to offshore delivery.
Platform well abandonment: Tailored, all‑in‑one abandonment packages supported by specialist well and structural severance technologies, combining surface riser systems, surface cutting and recovery services and coordinated project delivery for safe and efficient decommissioning.
Subsea well abandonment: Comprehensive engineering and intervention services, including riser systems, ROV hot-stab interfaces, riser tension systems, well severance and vessel based suspended well abandonment, all designed to meet complex subsea challenges.
Topside and jacket removal: End-to-end structural preparation, lifting analysis, heavy lift planning and cutting operations, for fully integrated, safe and efficient removal campaigns.
Subsea cutting and removals: Specialist subsea decommissioning capability covering vessel-based suspended well abandonment, multi-string below-mudline severance and recovery, delivered within a common engineering and planning framework ensuring campaign continuity.
Innovation-led solutions: Leveraging our collective capabilities, we invest in new tools, cutting techniques and methodologies that enhance safety, minimise risk, and improve overall abandonment and removal performance.

FEED and engineering that de-risks projects

Early-stage FEED studies and planning optimise project scope, reduce risk and guide efficient execution

Well access solutions streamline mobilisation and preparation for both topside and subsea interventions

Bespoke engineering and structural analysis, informed by CCS insight, deliver tailored, safe and future‑ready solutions

Subsea and topside removal that accelerates delivery

Complete subsea infrastructure removal, including pipelines, umbilicals and manifolds

Structure and jacket removal, with heavy-lift planning to accelerate offshore operations

Sub-mudline well severance, subsea well abandonment and seabed preparation for safe, controlled campaigns

Surface well recovery that enhances efficiency

Rigless surface well recovery solutions enhance safety and reduce operational costs

Execution methodologies are selected at campaign level, ensuring rigs, vessels and rig‑independent systems are deployed only where they add the greatest value

Integrated decommissioning and abandonment solutions for late‑life offshore assets

We support operators across global offshore basins with intelligently engineered, end‑to‑end decommissioning and abandonment solutions. Combining Aquaterra Energy’s well access, riser and structural engineering expertise with market‑proven severance and recovery capabilities from James Fisher, our flexible, integrated model provides campaign level engineering leadership, aligning scopes around a single technical baseline. This enables standardisation across well groupings and delivery through one integrated sequence — enabling simpler, safer delivery and keeping projects on track, while maintaining clear, direct contracting with each specialist to avoid unnecessary commercial complexity.

Early‑stage development insight helping operators define commercially strong routes before major commitments
Efficient, low‑impact severance and removal operations that minimise offshore time and environmental footprint
Built with regional delivery in mind, supporting local content and faster mobilisation
Single‑well through multi‑well, platform and subsea abandonment solutions adapted for water depth, geology and infrastructure

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Specialist rental equipment

Intelligently engineered equipment available on-demand to support offshore projects from seabed to surface including drilling and completions, intervention, subsea campaigns and late-life operations.

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Offshore developments

From early-stage studies and concept selection through to FEED, execution and late‑life planning, we support offshore developments with the engineering and solutions needed to shape the right development pathway. Working between seabed and surface, supporting subsea and surface tree developments, we help reduce risk, improve predictability and deliver more efficient, reliable project outcomes across the full lifecycle.

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Offshore analysis

Offshore analysis for the entire project lifecycle. We offer a comprehensive range of services on both one-off scopes and long-term analysis partnerships to provide clarity and confidence.

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“Decommissioning programmes are no longer simple or isolated — they demand tight engineering control, early integration, and the flexibility to adapt as conditions change. By aligning engineering, well access, and cutting from the outset, we can create more efficient scopes, avoid redesign, and reduce offshore risk. This partnership unites industry specialists as a single team while maintaining the agility operators need as projects evolve.”

Matthew Marcantonio

Head of Engineering

Aquaterra Energy

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Drilling

Proven, flexible and integrated drilling well access solutions, improving efficiency across subsea developments.

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Intervention & abandonment

Riser-based systems for safe and reliable well re-entry, for intervention and abandonment operations.

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Intelligent analysis supporting confident delivery, smarter investment and sustained project success.

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Expert CO₂ storage solutions, supporting tomorrow’s energy transition.

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Integrated subsea systems connecting seabed infrastructure through to surface operations.

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Trusted tension capabilities built for ease, longevity and performance.

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Platforms

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Delivering a full suite of specialist products, supported by decades of offshore expertise.

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Decommissioning

Full‑lifecycle decommissioning and abandonment support

A unified, specialist approach to abandonment and removal

FEED and engineering that de-risks projects

Subsea and topside removal that accelerates delivery

Surface well recovery that enhances efficiency

Integrated decommissioning and abandonment solutions for late‑life offshore assets