Activity details

Organisation	Santos WA PVG Pty Ltd
Project	Van Gogh Coniston Novara Field Developments
Activity types	Significant modification of a facility
In-force EP	7924
Submission date	01 August, 2024
Outcome	Accepted
Acceptance date	23 December, 2024
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

Activity Description

The petroleum activities covered in this EP include: • The disconnection and permanent sail away of the FPSO • the presence of all infrastructure on title and in the water column, up until subsea infrastructure is decommissioned (subject to a future decommissioning EP) • implementation of inspection, monitoring, maintenance, repair (IMMR) activities until all wells are plugged and abandoned (subject to future and separate P&A EP) and subsea infrastructure is decommissioned (subject to a future decommissioning EP) • flushing of both production flowlines A and B between DC3 and DC4, and DC2 and DC3. • floating asset removal (DTM, risers and wet parking of the DTM mooring lines). If deemed safe and practicable to do so, the unburied section of the DTM mooring lines may be removed as part of the FAR activities covered by this EP • removal of a 910 m damaged section of Coniston Novara production flowline B between DC2 and DC3 The subsea production system (with the exception of production flowlines A and B between DC3 and DC4, and DC2 and DC3) will have been flushed of hydrocarbons with treated seawater and left in a preservation state under the Operations EP. Flushing returns will have been processed through the FPSO and disposed of down hole in the water injection well or into the FPSO cargo and slops system and taken away via offtake tanker. The reservoirs will also have been isolated from the subsea production system at the XTs (barrier testing of the XTs will have been completed and verified as per the WOMP (DR-91-ZG-10048)) in preparation for the commencement of this EP. This EP commences with FPSO disconnection from the DTM. After FPSO disconnection and sail away the risers will remain connected to the DTM within the petroleum safety zone (PSZ) and are planned to be removed under this EP. A 910 m damaged section of Coniston Novara production flowline B between DC2 and DC3 will also be removed under this EP. All remaining flexible flowlines will remain in place on the seabed, connected to manifolds and will be subject to a future decommissioning EP, as will all other subsea infrastructure. A full summary of the infrastructure on title, and the status and condition, is provided in Table 2-1, Table 2-2 and Table 2-3 of the EP. The risers and DTM will be recovered and removed from the operational area as part of the floating asset removal activities. The DTM will be recovered to a vessel/barge or towed out of the operational area to a designated port. The DTM mooring lines and anchors will remain in the operational area and be subject to later decommissioning activity and EP; however, if deemed safe and practicable to do so, the unburied section of these may be removed as part of the activities covered by this EP.

Location map (click to enlarge)

Accepted EP Documents

EP Document	A1153296 (35.8 MB)
OPEP Document	A1153298 (5.9 MB)
OSMP Document	A1153302 (3.45 MB)

Related EP assessments

7924 (Click to view)