Woodside Energy is gearing up for the next phase of the Echo Yodel decommissioning, with the retrieval of the Echo Yodel umbilical expected to commence during the second half of 2025.
The company outlines its various decommissioning plans recently in its half-year 2025 results, stating that it had continued execution of planned activities in the first half of the year, spending approximately $565mn across its portfolio.
Woodside has progressed planned decommissioning activities across the Enfield, Griffin and Stybarrow fields, offshore north west Western Australia, as well as the Minerva field, offshore Victoria, it noted.
Next up, is the removal of the Echo Yodel umbilical, part of a phased decommissioning process that has been ongoing already for several years.
The Echo Yodel subsea decommissioning plan details the proposed removal of subsea infrastructure which includes a 23-km pipeline, an electrohydraulic umbilical, two umbilical termination assemblies, an infield umbilical termination basket and infield electrical and hydraulic jumpers.
It marks the latest step in what has been a busy year already for Woodside.
During the first half of 2025, it concluded the 10 well Stybarrow plugging campaign and successfully completed the plug and abandonment of three remaining wells at the Minerva field.
In February, final infrastructure was recovered from Enfield, concluding a multi-year decommissioning that included permanently plugging and abandoning all 18 Enfield wells, recovering and deconstructing the Nganhurra riser turret mooring and removing flexible flowlines, umbilicals and other subsea structures.
Enfield marked the first project that Woodside has taken from exploration to development and operations, right through to decommissioning.
The company also said that it experienced a Tier 1 process safety event when unexpected fluids were released during flushing activities of a Griffin subsea flowline, but added that water quality monitoring identified no impact on the environment.
The company is now currently evaluating decommissioning work plans for Minerva, Stybarrow and Griffin.
The as-left condition on some closed sites, it noted, “has continued to present challenges for safe and efficient execution of decommissioning and learnings are being applied to improve planning and execution.”
In the financial statement, it reported that these challenges were the primary driver of a $445mn pre-tax ($218mn post-tax) restoration expense being recognised in the profit and loss in the half-year results.
At Bass Strait, the Gippsland Basin Joint Venture has safely completed approximately A$2,500mn (100% share) of early decommissioning works, including the plug and abandonment of over 200 wells, the company added.
This includes the completion of plugging the Bream B and Kingfish A platform wells in the first half of 2025.
Looking forward, detailed engineering and execution planning, including submission of primary and secondary environmental approvals to regulators for assessment, is well advanced for the Bass Strait offshore platform removal campaign planned for 2027, Woodside noted.
