Preliminary activities would start from November 2024 with seabed assessments to determine suitable drilling and infrastructure locations. Subject to internal and external approvals, P&A of suspended legacy wells and drilling of new wells would commence from March 2025 and may continue up to January 2026.

Each well would take between 30 to 40 days to drill depending on whether the well is viable and will be developed for production. Each P&A well would take approximately 15 to 20 days.

The timing of activities will be subject to final approvals, the availability of the drilling rig after it completes programs of works for other companies and weather conditions. Beach will provide a detailed activity schedule prior to commencement.

The OGV Project includes both the Otway and Bass offshore basins. In the Otway Basin two legacy wells would be P&A and up to five wells would be drilled.

In the Bass Basin three legacy wells would be P&A. At this stage (and for purpose of the Environment Plan) no exploration or appraisal drilling is planned in the Bass Basin.

All new wells will be within existing permits and the indicative well locations are shown in the map below.

Depending on the size and geological structure of hydrocarbon reservoirs, the sequence of drilling often involves:

• an exploration well into a prospective hydrocarbon reservoir identified in a previous seismic survey.
• an appraisal well to establish the size of the reservoir.
• then completing a well to become a production well that would be tied back to a platform and / or pipeline.

Beach’s program of work would be optimised in well design and equipment so that exploration and appraisal wells would be drilled to the same specifications as a production well. By taking this approach, if the wells are assessed as viable for production, at the end of drilling they would be completed ready for connection. If they are assessed as unviable, they would immediately undergo the formal P&A process.

This approach will reduce the number of drilling activities and the time taken to explore, appraise and convert a well through to production, thereby also reducing environmental impacts from the activities.

The approach to drilling is summarised in the following key steps (see diagram below).

• Using an approved shipping route specialist anchor handling vessels (AHSVs) will manoeuvre the drilling rig into place.
• Mooring equipment will be pre-laid by the AHSVs and the rig will be connected at sites determined as suitable by the seabed assessments.
• Conductor and surface hole sections will be drilled and cased, then a marine riser and Blow-out Preventer (BOP) installed.
• The well would then be drilled to reach the gas reservoir beneath the seabed.
• The rig would be moved from one well to the next, repeating the anchoring and drilling process.

Beach would use the Transocean Equinox, which is a modern semi-submersible drilling rig designed for harsh weather and sea conditions. It can operate in waters up to 500 m deep, drill for gas at up to 8,500 m deep and accommodate 130 crew.

This type of drilling rig is commonly used for operations on the Norwegian Continental Shelf. Its design incorporates the latest technologies that mechanise hazardous operations enhancing the safety of personnel, improves fuel efficiency and utilises emissions reduction and monitoring systems.

The rig is equipped with a marine riser and Blow Out Preventer (BOP) which is a highly specialised valve unit weighing approximately 244 tonnes and measuring 14 m high. A BOP is used in all drilling operations however the offshore rig BOP is more robust with 100% duplication of functionality.

The BOP is used to shut-in and seal off a well in the event of an unplanned pressure build up or ‘kick’. Beach engineers use a rigorous process for the design of construction and operation of wells which, when combined with the rig contractor procedures and BOP equipment, ensures:

• well integrity throughout the drilling process and, in the case of production wells throughout the well lifecycle.
• ongoing personnel safety.
• prevention of any environmental incidents.

The drilling process would run over several stages starting with a top-hole section of approximately 91 cm in diameter, then reducing in diameter to consecutively smaller sizes until the well reaches the final target depth. For each section, a casing (steel pipe) would be placed in the hole and cemented in place, then a smaller drill bit would be run through the casing to drill a smaller hole to the next target depth and the process repeated to reach the final depth. This is usually several kilometres below the seabed.

Beach OGV Project drilling operations would use only water-based fluids called ‘muds’ to lubricate and stabilise the wellbores in each section and remove drilling cuttings. Drill cuttings are rock chips from the sedimentary layers that emerge from the drilling process and would range from very fine to coarse in size.

Water based muds are recycled as much as possible during the drilling process. The cuttings would be processed on the drilling rig before they are discharged overboard, where they will settle rapidly on the seafloor around the well site. This is standard industry practice in Australia.

Marine mammals and fish may transit through these areas but will usually avoid the temporary disturbance. Any exposure to suspended sediment before it settles on the seabed will be highly localised and temporary due to high dilution and fast dispersal in the water column.

When the production wells have been completed, they would be connected to seabed infrastructure and the existing offshore to onshore pipeline.

Some seabed infrastructure for tying in the new wells is already in place and connected to the existing pipelines.

Additional infrastructure for any new production wells would also be installed to tie-in to the existing pipeline. New infrastructure would typically include:

• Diving Integration Skid, which is a module that is installed on the seabed by divers from a dive support vessel and connected to an existing pipeline connection (hot tap) or offshore platform, ready for later connection of flowlines from the wells.
• Flowlines and various subsea connection modules to connect the production wells to the existing platform and pipeline.
• Electrical and hydraulic controls within cables that enable remote monitoring and control of the production wells.
• Concrete mattresses will be installed over the flowlines and/or umbilicals for stabilisation and protection as required.

A construction support vessel using an ROV would install the equipment and commission the production wells after they are connected.

If a well is commercially unviable and for the removal of existing suspended wells a formal plug and abandonment process would be carried out. Beach engineers design the well abandonment in compliance with the Norwegian Norsok and Oil and Gas UK standards industry best practice and guidelines, for example the Oil and Energy UK (OEUK) guidelines; standards that are recognised by NOPSEMA as current industry best.

Multiple cement plugs would be installed within the well to permanently seal the well and isolate any productive or water bearing formations reservoirs or hydrocarbon bearing zones.

An additional cement plug would be installed at the seabed and all casings will be cut and recovered from at least 2 m below the mudline to ensure that the seabed is returned to the same condition as it was prior to drilling operations commencing.

The National Offshore Petroleum Safety and Environmental Management Authority (NOPSEMA), regulates activities in accordance with the Offshore Petroleum and Greenhouse Gas Storage (Environment) Regulations (2023) (Environment Regulations). The OGV Project will require Environment Plans (EPs) to be accepted by NOPSEMA before commencement of activities. EPs will be prepared for different activity phases, including one EP covering drilling and P&A activities.

EPs must include a description of the existing environment, the proposed activities, an evaluation of the impacts and risks, environmental performance outcomes and controls, implementation strategy, and reporting requirements. They must also demonstrate that consultations with relevant persons whose functions, interests or activities may be affected by the activities in the EP (‘relevant persons’), have been carried out in accordance with the regulations.

For successful gas wells that would be developed for production, an Offshore Project Proposal (OPP) will be required and will undergo a public consultation phase. Once an OPP is accepted, further EPs will be required for construction activities and commissioning the new wells.

The OGV Project will require Environment Plans to be accepted by the National Offshore Petroleum Safety and Environmental Management Authority (NOPSEMA) before commencement of activities.

Environment Plans must include a description of the existing environment and the proposed activities, an evaluation of the impacts and risks, environmental performance outcomes and controls, implementation strategy, and reporting requirements.

Consultation and feedback with anyone whose functions, interests or activities may be affected by the project activities is an important part of developing Environment Plans.

View NOPSEMA's 'Consultation in the course of preparing an environment plan' here.

EPs will include a detailed description of the existing environment in the immediate operational area and in the broader emergency planning area where there is a variety of marine fauna, including the presence of:

• Blue, humpback and fin whales, particularly during the summer months.
• Southern right and minke whales, particularly during the winter months.
• Common dolphins and shark species throughout the year.
• New Zealand and Australian fur seals throughout the year.
• Migratory birds.

There will be no drilling within marine parks. However, within the broader emergency planning area, there are National Marine Parks and State Marine Protected areas (see above location maps).

Socio-economic and cultural values and sensitivities within the activity and emergency planning areas include:

• Commonwealth managed fisheries, including southern and eastern scalefish and shark, and southern squid jig fishery.
• Victorian managed fisheries, including rock lobster and giant crab.
• Commercial shipping activity.
• Sea Country cultural values and sensitivities held by First Nation peoples.
• Shipwrecks, primarily in close shoreline proximity.
• Recreational fishing.
• Recreational diving focussed on shipwrecks and reefs close to the shoreline.
• Signficant tourism features and activities associated with the Great Ocean Road, Twelve Apostles and Bay of Islands Coastal Park.

Beach recognises the environmental, cultural, heritage, social and economic values in our activity and planning areas.

We have a proud track record for safety and environmental performance, adhering to performance measures set out in EPs and Safety Cases accepted by regulators.

EPs will detail potential impacts on the environment, and provide performance outcomes and standards, and control measures to reduce and manage environmental impacts and potential risks to ALARP and acceptable levels, and follows the principles of ecologically sustainable development. ALARP stands for ‘As Low As Reasonably Practicable’. It is an assessment principle commonly used in the oil and gas industry to assess and reduce potential impacts and risks that cannot be eliminated. For information on how NOPSEMA assesses ALARP see: ALARP Guidance Note (nopsema.gov.au).

A summary of the key impacts, mitigations and management plans can be found here.

Environment Plans will set out detailed control measures that are consistent with marine mammal management plans that have been produced by the Federal Government under the Environment Protection and Biodiversity Conservation (EPBC) Regulations (2000).

These control measures are based on the avoidance of collision or entanglement of marine mammals, reducing vessel speeds, and minimising any anchor lines. The control measures also focus on the reduction of marine noise from vessel and drilling rig activities, so any noise produced does not impact the behaviour of a protected marine mammal.

Dedicated Marine Mammal Observers will be deployed on vessels to advise vessel captains and the drilling rig of protected marine mammals near our activities.

All whale sightings will be recorded along with the actions taken to avoid potential impacts.

The project activities would occur among commercial Commonwealth and State fisheries, which cover vast areas. The drilling activities require access to relatively small areas for short periods of time as described in the Project Timing section. Environment Plans will set out detailed assessment of fisheries and fishing activity that may overlap the project activities.

Beach will consult with commercial fishers on arrangements to ensure each other’s operational plans are understood, helping to minimise any impacts to fishing activities and to the OGV Project.

Beach will provide regular updates on its operations to fishing associations throughout the duration of the activities.

Beach has a Fair Ocean Access procedure, which sets out Beach’s commitment to consultation, minimising impacts of its activities, the circumstances in which a fisher may claim compensation, the evidence required and the claim process.

The project operations would occur in the Sea Country adjacent to coastal First Nations groups including: Eastern Maar Aboriginal Corporation; Gunditj Mirring Traditional Owner Corporation; Wadawurrung Traditional Owners Corporation; Bunurong Land Council Aboriginal Corporation; Gunaikurnai Aboriginal Land Council Tasmania; Flinders Island Aboriginal Association; and Tasmanian Aboriginal Centre.

Beach is consulting with these groups to identify cultural values of Sea Country so that they can be assessed for any potential impacts and control measures that may be required in the preparation of the drilling Environment Plan (and other Environment Plans).

In addition to cultural values identified through consultation, Beach has engaged a suitably qualified maritime archaeologist who will assess data gathered in the seabed assessment surveys. For any identified cultural landscape values and sensitivities within the activity area an underwater cultural landscape management plan will be developed.