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Griffin Gas Export Pipeline Decommissioning

Activity type Decommissioning, dismantling or removing a pipeline
Activity subtypes
Submitted by BHP Petroleum (Australia) Pty Ltd
Submission date 21 March, 2022
Subtype New
Decision date
RMS ID 6948
Status Under assessment (with titleholder)
Link to previously accepted EP
Contact
Clive Jones
Phone: 0863214496
Location map (click to enlarge)
Location map - Activity: Griffin Gas Export Pipeline Decommissioning (refer to description)
Description

BHP Petroleum Pty Ltd (BHP) is planning for the safe and sustainable closure of the Griffin Gas Export Pipeline (GEP).

The GEP is located within Pipeline Licence WA-3-PL, in Commonwealth waters, and extends from the pipeline end manifold (PLEM) in the Griffin field (WA-10-L) through WA State waters (Pipeline Licence TPL/10) to the shore, ~40 km south west of Onslow. Water depths along the GEP range from 130 m at the pipeline end manifold (PLEM) to 90 m at the State/Commonwealth waters boundary. The GEP is presently pressurised with a nitrogen blanket.

The scope of the EP includes the pigging and cleaning of the pipeline to remove mercury contamination, conducting an as-left survey of the pipeline and decommissioning the pipeline in situ in perpetuity. The scope also includes contingent pipeline removal activities should the mercury removal be unsuccessful.

Pipeline activities managed under this EP are planned to commence no sooner than Q1 2023, pending regulatory approvals, support vessel availability and weather constraints. The activities covered in the EP may occur at any time of year, with completion by the end of calendar year 2024.

The removal of the majority of the Griffin facilities (well heads, flowlines, subsea ancillary equipment) within the WA-10-L and WA-12-L licences is subject to an environmental approval currently under assessment and remaining field equipment (Riser Turret Mooring - if not fully removed, piles, anchors, concrete gravity bases) will be subject to a separate future environmental approval.

Other Details
Locations North West
Commonwealth waters adjacent to Western Australia
Titles (or other instruments) WA-3-PL
Current Documents (Under assessment)
EP Document


Location map