Woodside is planning to undertake subsea and well infrastructure removal decommissioning activities within the Angel Field, as part of the Petroleum Activity under this Environment Plan (EP). The Angel subsea and well infrastructure is located around the Angel production platform in Commonwealth waters, approximately 125 km north of Dampier. The Angel subsea infrastructure is in water depths between approximately 77 m and 85 m in Petroleum Title WA-3-L. Woodside plans to remove redundant Angel subsea infrastructure and three production wells connected to the Angel platform.
Activities covered by the Angel Subsea Infrastructure Removal Environment Plan include:
• Removal of three 14-inch rigid flowlines between the Angel platform and the AP2, AP3 and AP4 wells. The flowlines are carbon steel (with internal stainless-steel liner) and coated with polypropylene and concrete to provide stabilisation on the seabed.
• Removal of three 10-inch rigid tie-in spool pieces. Stainless steel with polypropylene and neoprene external coating.
• Removal of three 5 - inch flexible electro-hydraulic umbilicals between the Angel platform and the AP2, AP3 and AP4 wells. The umbilicals are coated with high density polyethylene (HDPE) and contain electrical and hydraulic cores.
• Removal of ancillary equipment, such as umbilical termination assemblies (UTAs) and associated foundations, jumpers, stabilisation materials.
• Installation of the permanent plugs / caps to preserve fluids within flowlines / umbilicals as close as practicable to the Angel platform.
• Removal of three wellheads (AP2, AP3 and AP4) using a construction support vessel under this EP if not removed by Mobile Offshore Drilling Unit (MODU) under the NWS Phase 1 Plug and Abandonment and TPA03 Well Intervention EP.
Removal of Angel subsea and well infrastructure is expected to require 3 months to complete, subject to vessel availability, unforeseen circumstances and weather. The Petroleum Activity is scheduled to occur between Q3 2026 and Q1 2027, with activities occurring 24 hours per day, seven days per week.
This EP is not intended to be the final decommissioning EP for Woodside’s property in WA-3-L, as such Section 270 of the OPGGS Act and title surrender requirements are not included in this EP.
