Woodside in the clear for plug & abandonment ops offshore Australia
What happened
NOPSEMA has approved Woodside’s environmental plan for permanent plug-and-abandonment of multiple subsea wells near existing WA facilities. The work is scoped for vessel-based operations, with a MODU fallback and an operational window described as approximately three to seven months including mobilisation and contingency. Treat this as an active mobilisation requirement: watch vessel availability, weather sensitivity and the chosen execution model (vessel vs MODU)
Buyer takeaway
This approval makes decommissioning a real tender opportunity; secure vessel and support logistics early because mobilisation timelines and weather windows drive cost and schedule
Cost / money
Sustained vessel or MODU day rates and extended support logistics are the primary cost drivers; unclear mobilisation terms will create contingency pass-throughs
Supplier / commercial
Suppliers will price for mobilisation risk and may offer different commercial profiles for vessel-based vs MODU-based execution—require clarity to compare bids
Safety / operations
Long-duration offshore P&A compresses readiness windows for crews and equipment; insist on documented SPS alignment and crew competency evidence in supplier bids
What to watch
Watch whether the operator switches between vessel and MODU strategies—each has different commercial and schedule implications that should be contractually anticipated
Key facts
- Approved P&A for four wells in WA permit area (WA-49-L and WA-34-L)
- Planned operations use vessel-based strategy with MODU fallback
- Operational window cited as approximately three to seven months including mobilisation and co
Source excerpts
If completed using a vessel-based strategy, no further activity will be performed under this EP. On the other hand, if the vessel-based strategy is not feasible or unsuccessful, the activity will be undertaken by a MODU-based strategy
The operator elaborates that timing and duration of the P&A activities are subject to change due to project schedule requirements, metocean conditions, vessel availability, unforeseen circumstances, and weather
The P&A and well intervention will be undertaken using a moored or hybrid semi-submersible MODU with up to three MODU support vessels and an inspection, maintenance, and repair (IMR) vessel
