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Independent decommissioning advisory

Engineering for the end of asset life

Independent decommissioning advice, from options assessment and cost planning through to execution support.

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  1. 01ConsultancyOptions, studies and decision support
  2. 02EngineeringRemoval concepts, temporary states and interfaces
  3. 03Asset intelligence

Fig. 01 Fixed platform in elevation, inside the Endura ring. Illustrative, not a specific asset.

The national picture

The scale of Australian offshore decommissioning

AUD 43.6 billion

Estimated cost to decommission existing offshore oil and gas infrastructure within the study’s Commonwealth-waters scope, 2025 to 2070, in real 2025 dollars. An indicative portfolio estimate that assumes full removal.

Source: Xodus for the Department of Industry, Science and Resources, published November 2025 (opens in a new tab)

The national figure sets the context. The decision basis for each asset still has to be established from its records, assumptions and interfaces.

Endura works where that basis is set: in the study, the estimate basis and the removal method, while the scope can still change.

Read the Australian Decommissioning Brief

Services

Specialist input at each stage of decommissioning

Engage Endura for a defined study, a specific engineering question or support across a wider programme. The scope, interfaces and required outputs are agreed at the outset.

  1. 01 Options and planning Comparative assessments, business cases and decommissioning plans that connect the asset boundary to the required end state. Decision criteria and options comparisonBusiness-case findings and recommendationsProgramme structure and close-out pathway
  2. 02 Engineering, cost and schedule Engineering development and review of the quantities, assumptions and dependencies behind a proposed scope. Removal concepts and constructability considerationsBasis-of-estimate inputs and quantity reviewSchedule logic and marine or disposal interfaces
  3. 03 Contracting and delivery support Contracting strategy and owner’s engineering support, with technical responsibilities and handovers made explicit. Work packages and contract-model considerationsInterface registers and tender strategyMethod review and client-representative support
  4. 04 Regulatory pathways and asset evidence Pathway mapping and documentation review aligned to the jurisdiction, asset and decision stage. Obligation and submission pathway mappingSource-register review and evidence trackingDocumentation gaps ranked by decision impact

What the work produces

The deliverable set follows the agreed engagement. Findings, source records, assumptions and unresolved items stay visible for the people taking the work forward.

Study report
Options, assessment findings, limitations and recommended next actions.
Technical basis
Scope boundaries, assumptions, methods and the interfaces affecting execution.
Commercial inputs
Cost and schedule basis, work packaging and technical tendering inputs.
Action plan
Priorities, responsibilities, dependencies and information still required.
All services Read the sample decision brief Capability statement PDF · 858 KB (opens in a new tab)

Informed by execution

The method has to work beyond the study

Removal concepts depend on the temporary states, marine interfaces and receiving conditions as well as the final lift or cut. These constraints belong in the planning and cost basis.

Explore method development
The crane vessel Sleipnir carrying a removed steel jacket at sea
Sleipnir carrying a removed jacketPhotograph: Heerema Marine Contractors

From offshore recovery to onshore dismantling

  • The crane vessel Thialf lifting a removed platform topside, with a removed jacket on a cargo barge alongside
    01Topsides removalSingle lift or piece small concepts, lift points, rigging and the temporary states either side of the lift.
  • A steel jacket covered in marine growth being lifted out of the sea at night beside a crane vessel
    02Jacket removal and transportCutting below the seabed, lift sequence, sea fastening and transport to the receiving yard.
  • Work-class ROV alongside a subsea tree on the seabed
    03Subsea infrastructure and pipelinesWhat is recovered, what can remain, and the cutting and recovery method for each item.
  • Aerial view of platform topsides and a jacket being dismantled at a decommissioning yard
    04Onshore dismantling and recyclingLoad-in, dismantling sequence, waste segregation and receiving-facility requirements.

Photographs: Heerema Marine Contractors (01, 02), Oceaneering (opens in a new tab) (03) and Able UK (opens in a new tab) (04, CC BY-SA 4.0 (opens in a new tab), edited).

Interactive 3D model

Asset explorer

A model with a purpose

Rotate an offshore platform or an onshore plant and select an evidence domain. The explorer connects documentation gaps to the physical systems, decisions and next actions they affect.

  • 9evidence domains
  • 2asset views, offshore and onshore
Open the asset explorer Follow a decision walkthrough

Illustrative cutaway, not to scale. The scores are a synthetic demonstration, not an assessment of an actual asset.

Technical library

Engineering knowledge and references

All technical resources
  1. END-FN-01The evidence behind a defensible closure estimateCost basisRev B · 14 Sep 2026
  2. END-FN-02The temporary state can govern the liftTemporary statesRev B · 14 Sep 2026
  3. END-FN-03Inherited asset records: find the evidence that changes the decisionInherited evidenceRev B · 14 Sep 2026
  4. END-FN-04How to read a NOPSEMA record without overreading itRegulatory recordsRev B · 14 Sep 2026
  5. END-FN-05Closure decisions are often won or lost at the interfacesScope interfacesRev B · 14 Sep 2026
  6. END-FN-06Estimate drift: explain what changed before explaining the totalEstimate revisionsRev B · 14 Sep 2026
END-BR-01 · Industry briefing A long horizon. A specific basis The national estimate, the scope behind it and what selected public records establish. Read the Australian Decommissioning Brief

Offshore records · Edition 01

Ten official records, each with its published status

An independent, source-cited register of selected NOPSEMA decommissioning records. Each entry separates scope, assessment outcome and reported commencement, with a link to the original source.

Records
10
Plans accepted
8
Under assessment
2

Accepted is an environment-plan outcome, not evidence that physical decommissioning is complete. Source review 18 September 2026. Selected records, not a national census or a list of Endura projects.

Browse the records
Australia, with selected record counts by NOPSEMA region: North West 5, Gippsland 3, Ashmore Cartier 1, Northern Territory 1. Markers are schematic, not asset locations. 5 1 1 3
Record counts by NOPSEMA region. Markers are schematic layout positions, not asset locations; no coordinates are plotted.

Working tools

Check the basis before you commit to it

These tools run in your browser. Answers and selections are not transmitted.

Jed van Iersel, Director of Endura Decommissioning
Jed van IerselDirector, Endura Decommissioning

The practice

Independent advice with direct technical involvement

Endura brings execution experience into front-end planning and engineering review.

Led by Jed van Iersel, the consultancy supports operators and delivery teams where uncertain scope, inherited records or unresolved interfaces are preventing progress. Jed has worked offshore since 2003: deck, rigging and lift supervision, then offshore construction management, then decommissioning management, before founding Endura.

The role is independent and vendor-neutral. Options are tested against the client’s objectives and the physical, marine and disposal constraints of the asset.

Career record Speak with Jed LinkedIn (opens in a new tab)
Trading name
Endura Decommissioning
Legal entity
Van Iersel Projects Pty Ltd
ACN
652 513 605
Based in
Doonan, Queensland

Separate platform offering

decomm.ai

Asset documentation intelligence for decommissioning.

Explore how inherited records and documentation gaps can inform the engineering basis. decomm.ai is presented separately from Endura’s consultancy services. The public demonstration uses illustrative data and does not calculate an accounting provision.

Explore decomm.ai Visit decomm.ai (opens in a new tab)

Discuss your project

Tell us about the asset, the scope and the timing

Start with the question your team needs to resolve and the information available.

Start a project enquiry jed@enduradecom.com +61 415 963 003 AEST