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Barossa Development Drilling and Completions

Activity type Drilling
Activity subtypes
Submitted by Santos NA Barossa Pty Ltd
Submission date 06 October, 2021
Subtype New
Decision date
RMS ID 6773
Status Under assessment (with titleholder)
Link to previously accepted EP
Michael Marren
Phone: (08) 62187100
Location map (click to enlarge)
Location map - Activity: Barossa Development Drilling and Completions (refer to 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.

Other Details
Locations Northern Territory
Commonwealth waters adjacent to Northern Territory
Titles (or other instruments) NT/L1
Current Documents (Under assessment)
EP Document

OPEP Document

Location map