Decommissioning and life extension analysis

Engineering clarity for complex late-life projects

Late-life assets demand a clear understanding of structural integrity, operational limits and future performance. Our in-house riser and conductor analysis supports operators with efficient decommissioning and life extension by assessing load-bearing capacity, fatigue, operational limits, rig suitability, and optimising decommissioning equipment. Working closely with offshore teams and stakeholders, we deliver practical, technically robust solutions that reduce risk, extend asset life, and support more efficient and predictable overall project efficiency.

Taking the uncertainty out of ageing assets

Decommissioning and life extension projects are more complex than ever, but expert analysis makes them significantly more manageable. Our in-house riser and conductor experts combine technical precision with operational experience to provide the engineering insight needed to support cost-efficient and predictable late-life operations globally.

Our analysis provides the insight needed to:

Assess the condition and integrity of risers and conductors, covering fatigue, corrosion, strength, stability, and operational limits
Optimise decommissioning equipment, rig selection, and vertical tension for safer, more efficient operations
Reduce technical uncertainty, minimise risk provide practical, actionable solutions that support more predictable project delivery.

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Engineering insights for decom and life extension

Strength and Stability Analysis

Evaluates risers and conductors to ensure they can safely withstand operational and environmental loads, maintaining structural integrity and stability during decommissioning or life extension projects.

Corroded conductor integrity assessments

Assesses the condition of ageing or corroded conductors, identifying weaknesses and helping operators make informed decisions on repairs, reinforcement, or operational limitations.

Fatigue analysis (both historic and future life operations)

Examines historical and projected cyclic stresses on risers and conductors to predict fatigue life, supporting safe decommissioning and future operational planning.

Optimisation of decommissioning equipment (historic and future operations)

Identifies the most efficient and the safest equipment configurations, reducing operational risk, downtime, and costs during decommissioning activities.

Assessments to aid rig selection

Evaluates rig suitability for specific decommissioning and late-life operations, considering load capacities, environmental conditions, and operational requirements to support safe and efficient project execution.

Well loading calculations and vertical tension optimisation

Calculates forces acting on wells, risers, and conductors to optimise vertical tension, ensuring structural integrity and safe, efficient operations.

Minimum allowable conductor wall thickness assessments

Determines the thinnest acceptable conductor wall thickness to maintain safety and performance, supporting informed maintenance, repair and replacement decisions.

Conductor repair analysis and optimisation

Provides technical guidance for repairing or reinforcing conductors, supporting operators in balancing safety, operational efficiency, and cost-effectiveness during late-life and decommissioning projects.

Products

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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Offshore analysis

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

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Carbon capture & storage

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

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Subsea

Integrated subsea systems connecting seabed infrastructure through to surface operations.

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Tensioning

Trusted tension capabilities built for ease, longevity and performance.

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Platforms

Innovative offshore platforms tailored to unique project needs, from concept to installation.

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Offshore equipment & services

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

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News & blogs

Well access for offshore decommissioning: What operators need to consider

Well access needs to be considered early in offshore decommissioning, particularly where ageing infrastructure or legacy equipment can constrain the abandonment programme. Understanding the condition of existing wells helps operators select suitable access systems and offshore units, while our well access engineering and partnership with James Fisher supports coordination from planning through to delivery. Planning […]

Decommissioning and life extension analysis

Engineering clarity for complex late-life projects

Taking the uncertainty out of ageing assets