OG90
Course Contents
Module 1 – Offshore Decommissioning Framework and Strategy
Key Topics
- Offshore asset lifecycle and decommissioning drivers
- Regulatory approvals, permits and stakeholder obligations
- Decommissioning strategy, scope and decision gates
- Asset inventory, liabilities and abandonment assumptions
- Safety case, HSE planning and marine risk controls
- Cost estimation, schedule basis and uncertainty management
- Interfaces between wells, facilities, subsea and pipelines
Module 2 – Well Plugging, Abandonment and Barrier Assurance
Key Topics
- Well integrity review and abandonment basis definition
- Permanent barriers, isolation objectives and verification
- Reservoir, caprock and annular isolation requirements
- Cement plug design, placement and quality assurance
- Casing, tubing, wellhead and conductor removal options
- Rig, rigless and vessel-based P&A execution methods
- P&A risk assessment, records and regulatory evidence
Module 3 – Facilities, Topsides and Structural Removal
Key Topics
- Topsides preparation, cleaning and hydrocarbon freeing
- Isolation, flushing, purging and making-safe activities
- Heavy lift, reverse installation and piece-small methods
- Jacket, piles and foundation removal considerations
- Lifting, cutting, marine spread and weather constraints
- Temporary utilities, access and offshore worksite control
- Onshore dismantling, recycling and waste segregation
Module 4 – Subsea, Pipeline and Environmental Management
Key Topics
- Subsea wells, trees, manifolds and control systems
- Pipeline and umbilical decommissioning options
- Leave-in-place, removal, burial and remediation criteria
- Survey, seabed clearance and debris management
- Environmental impact assessment and mitigation planning
- Waste handling, hazardous materials and disposal routes
- Marine protection, fisheries, navigation and site restoration
Module 5 – Execution, Assurance and Project Closeout
Key Topics
- Contracting strategies and supply chain readiness
- Vessel selection, logistics and simultaneous operations
- Project controls, progress tracking and cost governance
- Emergency response, marine coordination and assurance reviews
- Change control, technical deviations and risk escalation
- Completion records, verification and regulatory closeout
- Case study: develop an offshore decommissioning plan