Closed
WA Upstream Operations - Simpson Offshore Asset Removal & Disposal
Tender ID: 504536
Tender Details
Organisation:
Tender #:
STO-WA-PRO-002
Status:
Closed
Publish Date:
2 September 2022
Closing Date:
14 October 2022
Tender Description
Santos operates several offshore facilities through the Varanus Island hub, with a number having reached the end of their operating life.
Simpson Alpha and Bravo platforms fall within this category of assets and are located in WA state waters approximately 1km South of Varanus Island.
Simpson Alpha and Bravo were installed in 2001 and are mini-platforms consisting of two 30-inch conductors which form the substructure supporting a topsides module. A deck extension and two conductors where retrofitted and the substructure was reinforced via a 20-inch strut attached to the centre of the east side of the main deck and secured to seabed via two grouted piles that run through a seabed template.
The topsides weigh approximately 75 tonnes (each) and the substructures (above seabed) weigh approximately 95 tonnes.
P&A activities are due to be completed on the associated platforms wells in 2024.
There are also a number of associated Simpson pipelines that are to be considered as part of this scope. Two pipelines run between VI and the Simpson Bravo platform - an 18-inch production pipelines and an 8-inch gas lift pipeline (2.72km). These pipelines terminate at Simpson Bravo via a valve skid and connection to both Simpson Alpha and Bravo is via midline tees. A third 8-inch water disposal pipeline runs between Varanus Island and Simpson Alpha (2.47km). All three pipelines are bundled. An 18-inch replacement production pipelines was installed in the shore approach region and connects to the existing pipeline at KP1.18 (from the beach). A flat pack umbilical is also included in the bundle between Varanus Island and Simpson Bravo (2.72km). A replacement 115mm OD umbilical was subsequently installed between Varanus Island and Simpson Bravo.
The scope of work for this package is as follows:
• Provision of all services and equipment to facilitate the full removal and disposal of the Simpson Alpha and bravo platforms and associated pipeline system back to Varanus Island (to LAT)
Location
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