Australia

The United Kingdom and Australia have formed a partnership agreement to strengthen cooperation on offshore oil and gas decommissioning.

Announced in a joint statement, the governments of the UK and Australia have sought to establish the partnership that builds on the recently-signed Australia-UK Climate and Energy Partnership. It will combine the 40 years of UK expertise in the North Sea with the blossoming decommissioning services market in Australia.

The agreement was signed by Australian Minister for Resources and Minister for Northern Australia, Madeleine King, and the UK Minister for Services, Small Businesses and Exports, Gareth Thomas. Together, they agreed to encourage cooperation in areas including supply chains, knowledge and skills, regulations, and financing while supporting engagement between UK and Australian businesses engaged in decommissioning.

Furthermore, it will establish a working group comprising industry representatives, academic partners, and regulatory bodies to develop a collaborative framework and partnership programme. This will identify viable decommissioning projects that would benefit from cooperation, delivering these in accordance with international quality and sustainability standards.

Through the identification of capability, equipment gaps and strengths, the group will also facilitate the sharing of decommissioning expertise between the two countries with knowledge transfer opportunities.

McDermott has been awarded a large engineering, procurement, removal and disposal (EPRD) contract by Santos for the decommissioning of the Harriet Alpha platform and associated infrastructure, located offshore Western Australia.

The contract follows the successful execution of the Campbell decommissioning project for Santos in Australia. Part of the Harriet Joint Venture (HJV) assets, the Harriet Alpha platform is one of the largest facilities slated for decommissioning.

McDermott will provide EPRD services, including engineering, procurement and fabrication of specialised equipment, as well as the removal and transportation of the platform structure to an onshore facility for dismantling and disposal. The contract scope also includes the removal, transportation and disposal of a flare tower, exploration well and subsea development system comprising of two subsea template wells. 

Largest decommissioning project

"This is our largest decommissioning project to date, reflecting our continued commitment to delivering bespoke solutions for the timely, safe, and environmentally responsible removal of infrastructure at the end of its operational life cycle," said Mahesh Swaminathan, McDermott's Senior Vice President, Subsea and Floating Facilities. "McDermott's growing decommissioning portfolio in Australia also underscores the commitment we share to continue supporting circularity efforts in a lower carbon economy."

Project management and engineering will be executed by McDermott's team in Perth, Australia, with support from Batam, Indonesia and Kuala Lumpur, Malaysia.

With a commitment to recycling the Northern Endeavour floating production storage and offtake (FPSO) vessel in a safe and environmentally sound manner while achieving value for money, the Australian Government has released a request for tender (RFT) to find a supplier to recycle the vessel.

As works are underway to prepare the FPSO for a safe disconnection from the subsea infrastructure, the Government is seeking proposals from organisations to recycle the FPSO and manage the disposal of hazardous waste. This also includes the recycling of any furniture, fixtures, equipment, victuals or other on-board items. The FPSO will be towed to the ship recycling facility of the successful tenderer.

All FPSO recycling activities must comply with relevant regulatory requirements. This includes relevant safety, environmental protection and maritime regulations across international conventions and agreements, domestic legislation and regulations, and state legislation and regulations.

Interested parties must ensure registration to submit proposals through the AusTender website only. All requirements must be addressed in the RFT documents which are accessible on AusTender.

The Department of Industry, Science and Resources is holding industry briefing sessions for interested parties. There will be three separate briefings focussing on the commercial, financial and technical aspects of the RFT. To register for the briefings, participants can email the contact officer at This email address is being protected from spambots. You need JavaScript enabled to view it., and include the company name, name of the attendees and which session they will be attending, email addresses of all attendees, and confirmation that attendees have read and understood the briefing protocols including in the RFT documents. 

Submissions of the RFTs will close on 29 November 2024. 

The National Offshore Petroleum Safety and Environmental Management Authority (NOPSEMA), the Australian Government’s offshore energy regulator responsible for health and safety, well integrity and environmental management for offshore oil and gas, has accepted Woodside Energy’s plans to decommission the Minerva Field.

The field, previously operated by BHP Petroleum, is located in Commonwealth waters with the wells laying approximately 11 km southwest of Port Campbell in water depths of approximately 50-60 m. Woodside plans to remove all subsea infrastructure and equipment from the seabed associated with the Minerva development. According to NOPSEMA, activities covered by the decommissioning include:

• Ongoing field management activities (inspection and monitoring) for the Minerva subsea and well infrastructure until decommissioning;
• Removal of the Minerva gas pipeline bundle in Commonwealth waters. The pipeline comprises of approximately 4.9 km of 10-inch concrete coated rigid-steel flowline, bunded with an electro hydraulic umbilical and two 2-inch steel chemical injection lines and stabilisation materials;
• Removal of Minerva subsea infrastructure within VIC-L22 in Commonwealth Waters comprising of five inline pipeline structures, five tie-in spools, and associated equipment and stabilisation material.

Equipment removal activities are planned to commence as early as Q4 2024 and require approximately three to five months, subject to vessel availability and weather constraints.
The plans for the decommissioning were submitted to NOPSEMA earlier this year. Click here to learn more.

The Australian Institute of Marine Science (AIMS) and Australia’s Nuclear Science and Technology Organisation (ANSTO) have begun an investigation to explore the risk of radioactive materials accumulating in marine organisms following the decommissioning of offshore oil and gas infrastructure.

“The experiment will help operators and regulators understand the environmental risk of infrastructure like pipelines with residual levels of NORM (Naturally Occurring Radioactive Material), helping to guide decision-making around whether this infrastructure should be removed or safely left in the ocean,” said AIMS Researcher and experiment lead, Darren Koppel.

According to AIMS, naturally occurring radioactive elements in soils, rocks, the seabed can be accumulated in infrastructure like pipelines. The resultant accumulated NORM that can build up may be present in structures and, if left in the ocean following decommissioning, may eventually leach into seawater before being released into sediments on the ocean floor. This could have an impact on marine organisms.

Currently, there is little data available which describes at what levels NORM from the industry becomes dangerous to marine organisms, a problem the experiment is looking to remedy.

Experiment method

Using facilities in the National Sea Simulator at AIMS’ Townsville headquarters, scientists have dosed marine sediments collected at the AIMS jetty and beach with specific amounts of NORM, and then placed the organisms in the sediments to determine concentrations above which the organisms may start experiencing harm.

The team also extracted eDNA from the sediments to understand and characterise the bacteria biodiversity, and to see whether the radioactivity brought about a change in the bacterial community over the course of the four-week experiment.

“The default position in Australia is that all offshore oil and gas infrastructure must be removed from the ocean when it is no longer being used,” remarked Koppel. “But leaving infrastructure in-situ may be allowed if the oil and gas operator can demonstrate this will result in an equal or better environmental outcome than removing it, that any environmental risks and impacts will be acceptable, and leaving it will comply with Australia’s obligations under international conventions.”

AIMS scientists are also investigating other aspects of the decommissioning question, including the habitat value of offshore structures and whether they can help maintain populations of marine species (including invasive ones and those important for Australian fisheries) by aiding dispersal processes.

Cutting Underwater Technologies has announced the successful completion of all required cuts for a key client as part of a large decommissioning project offshore Western Australia.

The company's proprietary 315” cutting machine, which it claims is the largest of its kind, was used to deliver the project. Four cuts of as much as 6-m diameter performed by a diamond wire cutting machine were executed with precision.

In 2024, CUT has completed 32 projects across six continents. The company's full suite of cutting solutions covers a wide range, from chain cutters and pipe/conductor/riser cutting machines to the largest machines for mid-water arches, disconnectable single-point moorings, and most recently, riser turret mooring structures.

CUT have exclusive use of a patent for castellated/step cuts, which have been recommended by the Government of Western Australia (Department of Energy) to minimise risk in decommissioning offshore platforms. The completion of a step cut mitigates against any danger of structural members such as platform legs sliding or having horizontal movement relative to the bottom part once cut. A step cut would provide structural stability, even with the top part of the platform resting on the bottom part. Cuts can be done remotely, in air, or subsea, removing the risk of having personnel in the cutting vicinity.

Imrandd has delivered advanced inspection data analytics and integrity service for a major upstream operator in Australia, expanding its global footprint

The work determined the future condition of a caisson on an offshore asset, reliably confirming its integrity until cessation of the production facility. The project holds marked significance in saving operational costs as it eliminated the need for a very expensive caisson replacement project.

For the Australian E&P business, Imrandd’s team of data scientists and engineers used their propriety technologies to collate and condition data sets from two existing ultrasonic corrosion mapping inspections conducted several years apart. Rather than using the conventional industry approach where uniform corrosion rates are assumed, the company utilised advanced corrosion growth models that account for changes in both corrosion extent and depth, with statistical analysis of the thickness variations between inspections providing the basis for more representative future condition estimates.

Imrandd CEO Innes Auchterlonie said, “We are thrilled with the results of our first project in Australia, which demonstrates our ability to deliver high value asset integrity analysis and recommendations that allow our clients to make informed decisions that count. Our blend of advanced technologies and experienced specialists deliver actionable insights, arming our customers with the right information to reduce operational costs, enhance integrity and extend the life of assets.

“By highlighting issues before they become critical, operator’s integrity management strategies can evolve from reactive to proactive. As the energy transition ramps up, this approach is not just applicable to oil and gas assets but any sector with safety critical equipment and infrastructure.”

McDermott has announced the safe and successful decommissioning of the Campbell platform and associated offshore infrastructure at the Varanus Island hub in Western Australia

Under a contract awarded to McDermott in January by Santos, the company provided engineering, procurement, removal, and transportation of the platform topsides, substructure, and associated items to an onshore facility for dismantling and disposal.

"The successful removal of the Campbell platform topsides and substructures leveraged our expertise in circular practices and subsea project execution across the energy value chain," said Mahesh Swaminathan, McDermott's Senior Vice President, Subsea and Floating Facilities, McDermott. "This demonstrates our commitment to support clients in tackling complex challenges with creative problem-solving solutions that enable offshore decommissioning efforts and circularity across Australia's energy sector."

The deployment of a custom-built lifting cradle was central to the project's success. Designed and constructed at McDermott's Batam fabrication yard, with engineering support from teams around the world, the lifting cradle was specifically engineered to address the unique complexities of the platform's upper substructure.