An IRATA multi disciplined NDT inspector conducting crane boom ultrasonic inspection and visual inspection as part of a wider lifting equipment and crane inspection campaing on an FPSO

Decommissioning Package (V-COMM)

Vertech’s V-COMM Decommissioning Package was formed to support the full decommissioning cycle. Providing a collection of specialist services, systems, processes, and products, Vertech’s experts will work alongside each client to achieve environmental & safety excellence, reduce cost through efficiency, and exceed all regulatory requirements.

The Australian offshore petroleum industry has existed since the early 1960s. As the sector matures, more offshore petroleum projects across the APAC region are reaching the end of their productive lives. A substantial number of the approximately 136 fixed facilities (including pipelines) is anticipated to commence decommissioning activities in the coming decade.

Decommissioning Services

FPSO and Oil Rig. Vertech can provide decommissioning to both.

Each piece of infrastructure can present its own unique decommissioning challenges due to the combination of infrastructure type and its location in the surrounding environment.

Major offshore infrastructure that requires decommissioning at the end of a project include:
  • Surface infrastructure – concrete and steel platforms including topsides and jackets
  • Floating installations – floating production facilities (FPSOs)
  • Pipelines – trunk lines, rigid flow lines, flexible flowlines, umbilicals
  • Subsea systems – wellheads, production modules, anchors, CGSs, mattresses

Decommissioning Planning

The foundations of a successful decommissioning project are built through detailed planning and early engagement with regulatory bodies and specialist contractors relevant to each phase of the decommissioning cycle. This early engagement ensures a comprehensive and shared understanding of the specifics of the Well Management Plan (WMP), Field Management Plan (FMP), Environmental Plan (EP), and Safety Case (SC) and how this framework combined with the specific state regulatory requirements/bodies will impact each phase of the decommissioning cycle.

From environmental, topside and subsea engineering through to implementation management, Vertech Group has a wealth of experience and skills that can provide critical services throughout the comparative risk, cost, environmental and regulatory approval phases. Our team also have the understanding to most effectively utilise the tacit knowledge gained in these early stages, using it to improve the support, selection and implementation of the final decommissioning methodology.

Decommissioning planning.
Our decommissioning planning services include:
  • Environmental engineering
  • Integrated activity planning
  • Project engineering
  • Site survey & assessment
  • Technical services
  • Rigging and lift planning

Topside or Disconnect Preparation

Before the full decommissioning process can be undertaken, the platform, FPSO or asset must be prepared. This is a crucial preparatory phase in the decommissioning cycle. Vertech Group’s multi-disciplined, high-mobility inspection and maintenance teams can provide maximum value at this phase. For offshore platforms, the integrity of the infrastructure needs to be carefully surveyed and understood in anticipation of major lifting operations.

Simultaneously, the assessment, planning, and execution of major plant and machinery removal are required to ensure environmental protections are in place. When it comes to floating assets, major module lifts are unlikely, so the campaign’s principal focus shifts to hull structural integrity for towing operations, machinery removal, and disconnecting critical systems (electrical, hydraulic, etc.).

Topside or disconnect preparation provided by Vertech Group.
Examples of Vertech Groups topside or disconnect specialisations include:
  • Premobilisation training and mock-ups
  • Rigging, lifting and removal of anything not part of the primary structure
  • Inspecting and surveying primary, secondary or marine structures
  • Cutting and mechanical services to remove piping and tertiary steelwork
  • Inspection of process and plant equipment’s structural integrity
  • Removal and cutting of cables between deck modules
  • Inspecting, NDT, proof load testing, and installing lifting points
  • Subsea inspection of marine growth, hull, and jacket structures
  • Access management & planning
  • Subsea infrastructure surveying – Mini-ROV and Autonomous Underwater Vehicle survey
  • Preparing detailed rigging and lift plans
  • Building detailed safe work method statements
  • Subsea marine environmental baseline inspections

Topside & Jacket or Disconnect Support

The topside and jacket removal is the largest cost and risk to the decommissioning cycle. Depending on the selected decommissioning methodology, almost two-thirds of the total costs can come from the removal. Having the right tooling and specialists to minimise delays and provide dynamic support is imperative.

FPSO disconnects are significantly quicker and have a lower risk and cost profile than platforms. The disconnect phase involves disconnecting the production risers, umbilicals, and mooring chains from the FPSO for its sail away, followed by carefully removing and disposing of the turret mooring system and subsea infrastructure.

Jacket decommissioning service.
Our topside & jacket or disconnect support includes:
  • Access management & planning
  • Major lift rigging and lifting implementation
  • Preparing detailed rigging and lift plans
  • Cutting and mechanical services
  • Building detailed safe work method statements
  • Subsea / topside live visual feed through ROV systems

Post Commissioning Monitoring

Decommissioning activities are regulated through the submission and approval of revised Field Management Plans (FMP), Well Management Plans (WMP), Environment Plans (EP) and Safety Cases (SC). Our specialists work closely with the asset owner to plan and optimise environmental monitoring (particularly where infrastructure is partially commissioned or decommissioned in situ) to confirm that impacts have been reduced to ALARP. Through our subsidiaries in Geo Oceans and Blue Ocean Marine Services, Vertech Group is able to offer asset-deployed or vessel-of-opportunity Mini-ROV systems and industry-leading Autonomous Underwater Vehicle (AUV) systems for detailed and comprehensive post-decommissioning monitoring.

Geo Oceans has set a new standard in survey efficiency and data quality by performing real-time data analysis and processing tasks in the field. Our ROV systems and towed cameras combine with our GO Visions™ software, allowing us to create fine-scale habitat maps across large areas far more accurately and efficiently than previously possible. The data collected will enable us to provide fish surveys with millimetre accuracy and bathymetry survey data for mapping marine habitats.

Geo Oceans decommissioning services.
Geo Oceans specialise in:
  • Real-time statistical data processing to check the data meets requirements
  • Production of fine-scale subsea maps (in real-time)
  • Stereo images allow accurate size measurements
  • HD still imagery and video footage with real time data transfer
  • Scour monitoring

Blue Ocean Marine Services

Blue Ocean Marine Services has a sound understanding of and unparalleled experience in the offshore regulatory environment relating to early site appraisal and late field decommissioning cycles.

Blue Ocean Marine services combine a fleet of industry-leading light Autonomous Underwater Vehicle (AUV) technology, marine scientists, specialist tooling, sensors, and cutting-edge software to provide fully autonomous subsea post-decommissioning monitoring and survey packages.

Blue Ocean Marine Services decomissioning services.
Blue Ocean Marine Services specialise in:
  • Passive Acoustic Monitoring (PAM)
  • Environmental and ecological surveys
  • Water and sediment sampling / testing
  • Meteorological and oceanographic surveys
  • Scour monitoring
  • Benthic habitat mapping

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Capability Statement

Offshore Capability Statement Cover Page
Offshore Services
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