Well Plug & Abandonment We plan safe and efficient plug and abandonment of subsea and platform wells that have reached the end of their working lives using a holistic structural analysis approach and risk-based engineering assessments. Re-entering ageing subsea wells for plug and abandonment requires an understanding of the remaining structural capacity of the wellhead and conductor. Incomplete asset data, time-dependent degradation such as corrosion and subsidence and changes in design approach from installation to present day make this challenging. The latter is particularly important when the operation of modern, high specification vessels and well control equipment on obsolete wellhead designs is proposed. Our structural analysis experts apply a thorough understanding of the safety philosophy on which industry design codes are based, and a pragmatic approach to risk, to abandonment assessments. They select an analytical approach that minimises the conservatism of the assessment within appropriate limits. This will allow you to identify and mitigate potential concerns early to ensure plug and abandonment operations are conducted as smoothly as possible. Our engineers have a proven track record in planning plug and abandonment operations in the Gulf of Mexico, North Sea, Irish Sea and offshore Australia. We can also work with other companies in our Group, who offer complementary capabilities in casing cutting and retrieval tools, marine procedure management, lifting and retrieval services, and facilitation of multi-operator abandonment programmes. Key Services Subsea & Platform Well Abandonment Strength, fatigue and stability analysis of riser, wellhead and conductor systems Tensioning requirements of the conductor and casing during plugging and abandonment Vertical well loading assessment Identification of maximum tubing pull loads Engineering criticality assessment Corroded and displaced well integrity assessment Original well build simulation for in situ loads Definition of allowable pressures for abandonment operations Vessel drift-off limits and watch circle assessment Jack-up rig modelling Jack-up barge cantilever assessment Component analysis of crossover tools and existing connectors Design of conductor strengthening systems Planning & Supervision Services Data gathering and review of historic records Cost comparisons and concept selection Vessel selection and feasibility studies Project Experience Centrica Energy – F3-8 well plug and abandonment from a jack-up Interact – HRL Morecambe Bay abandonment riser analysis Shell – Draugen well plug and abandonment wellhead system fatigue analysis Chevron – Alder suspended well plug and abandonment fatigue analysis BG – Everest subsea exploration well plug and abandonment fatigue analysis TAQA – Cormorant UMC 13-5/8” wellhead system plug and abandonment fatigue analysis BP – Na Kika F3 well plug and abandonment analysis with Ensco DS3 rig BP – Thunder Horse 777-5 well plug and abandonment analysis with West Capricorn BP – MC217-1 well plug and abandonment analysis with West Vela Shell – Macaroni and Europa plug and abandonment analysis with Q4000 Shell – Popeye upper abandonment analysis with Atwood Condor Share this page Share on FacebookShare on LinkedinShare on Twitter Services Deepwater Production Systems Riser Concept Engineering Steel Lazy Wave & Catenary Risers Top Tensioned Risers Hybrid Risers Flexible Risers, Flowlines & Umbilicals Composite Risers Subsea Flowlines & Jumpers Subsea Umbilicals System Verification & CVA Integrity, Life Extension & Monitoring Riser Integrity & Life Extension Subsea Wellhead System & Life Extension Machine Learning for Riser Engineering Riser System Digital Twin Riser Monitoring System Engineering Riser Inspection, Maintenance & Repair Subsea Incident Engineering Fracture Mechanics and ECA Offshore Renewables & Alternative Resources Fixed Offshore Wind Floating Offshore Wind Moorings & Anchors HV Cable Engineering Deep Sea Mining Drilling, Completion & Workover Drilling Risers Drilling Riser Management Subsea Completion & Workover Risers Subsea Wellheads & Conductors Offshore Platform Conductors Platform Well Integrity & Life Extension Well Engineering Well Plug & Abandonment Minimum Facility Platforms Conductor Supported Wellhead Platforms & CoSMOS Monopile Wellhead Platforms Exploration to Early Production Systems Structural Engineering Services Installation Engineering Decommissioning Engineering Riser Delivery Management Component Detailed Design Mechanical Connectors Systems & Qualification Testing Related BLOG Re-entering Old Wells: How to Deal with Fatigue February 2017 Read the blog TECHNICAL PAPER Engineering to Extend Life of Platform Wells See all Technical Papers TECHNICAL PAPER Life Extension of Ageing Platform Well Conductors See all Technical Papers