Study report
The decision, basis, options, findings, limitations and recommended next actions.
Services / Advisory & engineering
Engineering for asset closure
From the first study to execution support, the work stays proportionate to the decision, the asset and the evidence.
Capability statement (opens in a new tab)Define the discussion
Find a starting point for your scope.
Select the asset setting, the decision ahead and the records available.
A useful starting point
Potential outputs
Useful starting records
Relevant services
A starting point for discussion. The scope and deliverables are agreed after review of the project context.
Eight connected areas of expertiseOpen a scope to see the detail ↓
01Comparative assessment and business case
When this is useful
A removal or closure option needs a documented basis for the next decision.
Useful starting information
Asset inventory, scope boundary, required end state, previous studies and decision criteria.
Work undertaken
- Frame the options and applicable assessment criteria
- Comparative assessment or best practicable environmental option (BPEO) support where applicable
- Compare safety, technical, environmental, regulatory, schedule and cost factors
- Record the assumptions and unresolved evidence
Deliverables
- Options comparison
- Assumptions register
- Decision brief and next actions
The assessment basis, specialist inputs and decision responsibilities are agreed for the actual scope.
02Decommissioning plan development
When this is useful
The work, dependencies and close-out evidence need a coordinated plan.
Useful starting information
Asset scope, obligations already identified, current studies, proposed milestones and interfaces.
Work undertaken
- Define scope boundaries and the intended end state
- Structure the programme and stakeholder requirements
- Identify handovers and closure evidence
Deliverables
- Decommissioning plan
- Scope and interface register
- Dependencies and evidence requirements
Planning follows the asset scope, jurisdiction and agreed study stage.
03Asset retirement obligation (ARO), cost and schedule support
When this is useful
An engineering estimate or revision needs a clearer scope and assumptions basis.
Useful starting information
Previous estimate, quantities, source records, method assumptions, pricing date and schedule.
Work undertaken
- Review quantities, scope logic and method assumptions
- Develop the engineering basis of estimate
- Reconcile changes and schedule dependencies
- Estimate maturity, classification basis and limitations, where applicable
Deliverables
- Engineering basis of estimate
- Assumptions and exclusions
- Estimate change reconciliation
Engineering inputs support the provision basis. Accounting recognition, measurement and reporting remain with the entity and its finance advisers.
04Method and engineering development
When this is useful
A removal or dismantling concept needs to be developed or challenged.
Useful starting information
Drawings, current condition, weight basis, access and handling constraints, isolation interfaces.
Work undertaken
- Develop removal and preparation concepts
- Review constructability and temporary-state considerations
- Define transport, load-in and disposal interfaces
Deliverables
- Method narrative
- Temporary-state and interface register
- Further engineering and verification requirements
The engagement defines the study stage, disciplines, checks and deliverables required. Specialist design and well P&A inputs are scoped separately where applicable.
05Contracting and execution strategy
When this is useful
Work packages need clear boundaries and acceptance responsibilities.
Useful starting information
Proposed scope, delivery model, programme, interfaces and existing procurement material.
Work undertaken
- Develop scope packages and contract-model considerations
- Define interfaces and demarcation
- Prepare technical tendering inputs
Deliverables
- Work-package boundaries
- Responsibility matrix
- Technical tender and response inputs
Commercial arrangements and responsibilities are confirmed within the agreed engagement.
06Regulatory and permitting pathway
When this is useful
Applicable processes and supporting evidence need to be mapped.
Useful starting information
Jurisdiction, asset and title or land context, planned activities, permissions and correspondence.
Work undertaken
- Map applicable obligations and pathways
- Develop submission inputs
- Track evidence and close-out requirements
Deliverables
- Pathway register
- Submission support material
- Evidence and status actions
The relevant authorities determine assessment outcomes and approval timing.
07Owner’s engineer and delivery support
When this is useful
The owner needs technical continuity through defined delivery activities.
Useful starting information
Agreed package scope, contractor methods, technical basis, programme and review requirements.
Work undertaken
- Review methods and technical submissions
- Manage defined interfaces and scope issues
- Provide agreed client-representative support
Deliverables
- Technical review records
- Interface actions
- Agreed progress and issue reporting
Authority, site responsibilities and review boundaries are defined in the engagement.
08Documentation gap review
When this is useful
Inherited records conflict or do not support an upcoming decision.
Useful starting information
Document index, source files, revision information and the decision being supported.
Work undertaken
- Review the source register and record position
- Identify discrepancies affecting the decision
- Prioritise verification and remediation
Deliverables
- Source register
- Discrepancy log
- Prioritised verification actions
A decomm.ai walkthrough can be scoped separately where the platform offering is relevant.
The handover
Deliverables for the next stage.
Outputs are tailored to the decision stage, with the assumptions, interfaces and remaining actions carried into the next review.
Technical basis
Scope boundaries, assumptions, interfaces, methodology and evidence position.
Commercial inputs
Cost and schedule basis, work packaging, tendering and contracting inputs.
Action plan
Priorities, ownership, dependencies and information that still needs to be verified.
Regulatory context
Regulatory context and scope boundaries.
The applicable framework depends on the jurisdiction and the asset scope.
Commonwealth waters
The Offshore Petroleum and Greenhouse Gas Storage Act 2006 provides the Commonwealth offshore framework. NOPSEMA identifies removal of all property as the base case and regulates compliance with decommissioning obligations.
NOPSEMA guidance ↗ (opens in a new tab)Title surrender
For a petroleum permit, lease or licence, the titleholder applies through NOPTA for Joint Authority consent to surrender. This title process sits alongside decommissioning obligations and NOPSEMA’s assessment role.
NOPTA title process ↗ (opens in a new tab)State onshore regimes
Onshore requirements follow the relevant state regime. In Western Australia, onshore petroleum proposals are assessed under the Petroleum and Geothermal Energy Resources Act 1967. Other agency assessments and approvals may also apply.
WA petroleum framework ↗ (opens in a new tab)Start with a conversation
Discuss your projectDiscuss your decommissioning scope.
Tell us about the asset, the work required and the timing. Endura can help define an appropriate scope of support.