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Activity - Barossa Development Drilling and Completions

Activity details
Organisation Santos NA Barossa Pty Ltd
Project Barossa Area Development
Activity types Drilling
In-force EP 6773
Submission date 06 October, 2021
Outcome Accepted
Acceptance date 14 March, 2022
Locations Northern Territory
Start date 26 June, 2022
Stop date Pending titleholder notification
Please note: activity start and stop dates are based on notifications provided by the titleholder.

Titleholder contact
Michael Marren
Phone: (08) 62187100

Activity Description
The Barossa Development is an approved offshore natural gas development located approximately 263 kilometres north-west of Darwin. The development will backfill gas supply to the existing Darwin LNG (DLNG) facility at Wickham Point. Santos NA Barossa Pty Ltd (Santos), as Operator, on behalf of co-venturers SK E&S Australia Pty Ltd and Santos Offshore Pty Ltd, is currently executing the Barossa Development, with first gas production targeted for the first half of 2025.

The Barossa Development is described in the Barossa Development Area Offshore Project Proposal (OPP), which was accepted by the National Offshore Petroleum Safety and Environmental Management Authority (NOPSEMA) in March 2018.

As part of the approved development, Santos is planning to commence the development drilling and well completions campaign (the ‘petroleum activity’) within Commonwealth petroleum production licence NT/L1 in Q2 2022. The campaign will continue on a 24-hour basis until completed.

The ‘operational area’ encompasses the entire petroleum production licence. Water depths over the operational area range from approximately 204 m to 376 m. The operational area is approximately 33 km from the Oceanic Shoals Australian Marine Park.

Six subsea production wells are planned to be drilled and completed around the future locations of three subsea production manifolds, with two wellheads adjacent to each manifold. If required, up to two contingency production wells could be drilled and completed at any manifold (eight wells in total). This EP provides for drilling and completing the wells using a semi-submersible Mobile Offshore Drilling Unit (MODU) and light well intervention (LWI) vessel, and the ongoing management of the complete wells until future commissioning and production phases.
Activities included in this EP are:
• Movement of the MODU within the operational area.
• MODU and vessel commissioning and demobilising activities.
• Deployment and recovery of the MODU anchors and mooring lines.
• Drilling operations.
• Well completions, including perforating and well flowback.
• Installation of Christmas trees.
• Contingency activities such as side-track drilling, re-drilling sections, re-spud and abandonment
• Well intervention.
• Ongoing well inspection, maintenance and management.
• General operations associated with the use of a MODU, vessels, helicopters and remotely operated vehicles (ROVs) within the operational area.

A petroleum safety zone will extend in a 500-m radius around the MODU surface location (at each drill centre) and completed subsea well location. During drilling activities, a cautionary zone will be place around the MODU and anchors which may extend up to 2.5 km from the MODU.

This EP will remain valid from the date that it is accepted by NOPSEMA, until 31 December 2025.
Location map (click to enlarge)
Location map - Activity: Barossa Development Drilling and Completions (refer to description)

Accepted EP Documents

EP Document A831694 (21.5 MB)
OPEP Document A821499 (8.63 MB)
Statement of reasons A842256 (14.1 MB)

Related EP assessments

6773 (Click to view)