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Activity - Echo Yodel Subsea Decommissioning

Activity details
Organisation Woodside Energy Ltd
Project North West Shelf
Activity types Decommissioning, dismantling or removing a pipeline
Any other petroleum-related activity
In-force EP 5222
Submission date 17 April, 2020
Outcome Accepted
Acceptance date 24 March, 2022
Locations North West
Start date Pending titleholder notification
Stop date Pending titleholder notification
Lifecycle Classification Decommissioning
Please note: activity start and stop dates are based on notifications provided by the titleholder.

Titleholder contact
Amanda Fuery
Phone: 08 9348 4000

Activity Description
Woodside Energy Ltd. proposes to remove the Echo Yodel subsea infrastructure within Permit Area WA-9-PL. The ‘Echo Yodel subsea infrastructure’ is defined as:

• a pipeline with pig launcher connected
• an electrohydraulic umbilical (EHU)
• two umbilical termination assemblies (UTAs)
• an infield umbilical termination basket (IUTB)
• infield control jumpers.

The infrastructure is located in Commonwealth waters in the NWS Province, about 140 km north west of Dampier on the coast of Western Australia. The closest landfall is the Montebello Islands, which are approximately 68 km to the south of the Operational Area. The Operational Area is defined as a radius of 1500 m on either side of the pipeline and EHU.

The infrastructure will be removed between 2022 and 2026 by a number of vessels during one or multiple campaigns. The cumulative duration of the activity is two to eight months and is dependent on further engineering assessment, vessel availability and unforeseen circumstances and weather. Once underway, activities will be 24 hours per day, seven days per week.

The pipeline will be recovered via reverse reel lay, reverse S-lay, cut and recover, or a combination of these three methods. The EHU is planned to be recovered onto reels using a heave compensated crane and associated equipment. Deburial and marine growth removal (e.g. water jetting) may be required to enable safe recovery of the infrastructure.
Location map (click to enlarge)
Location map - Activity: Echo Yodel Subsea Decommissioning  (refer to description)

Accepted EP Documents

EP Document A830461 (21.5 MB)
NOPSEMA Report A833914 (229 KB)

Related EP assessments

5222 (Click to view)