The Well Completions and Interventions EP activities are expected to be undertaken between 1 January and 31 December 2026, and would take approximately 145 days to complete, including:

• 25 days per well for the installation of subsea equipment and well completions activities
• 15 days per well for intervention activities
• 15 days for contingency P&A activities at one location.

All timings are approximate and will be subject to final approvals, the availability of the drilling rig after it completes programs of works for other companies, weather conditions and prior drilling results.

Beach will provide a detailed schedule of times, locations and activities prior to the commencement of the relevant activities.

The activities would be carried out in the Otway Basin in offshore Commonwealth waters, approximately 20 km south of Victoria’s mainland and 90 km north-west of Tasmania (King Island) at its closest points, in water depths ranging from 65 m to 190 m. All activities would be within existing Beach permits, the locations of which are shown in the maps on this.

Seabed assessment activities will occur prior to drilling wells to ensure precise locations for the operation of the drill rig and, ultimately, the wells that will be drilled. Should the location of wells be modified after the seabed assessment activities have been completed, Beach will advise all Relevant Persons and provide an updated map.

Well completion is the process of preparing a well for production after it has been successfully drilled. It involves installing production and flow control equipment within the wellbore on the seabed and completing the final construction of the well. Each well will have a wellhead that supports the production well casing. Completions operations are conducted with well control equipment called a blow-out preventer (BOP) and a subsea production tree (subsea tree) placed on the seabed at or near the site of the well.

The BOP is a highly specialised series of valves used in all offshore drilling, weighing approximately 244 tonnes and measuring 14 m high. The BOP is used to shut-in and seal off a well for planned operations such as pressure testing and in the event of a pressure build up. It ensures well integrity throughout the drilling and completion process, ongoing safety of personnel and prevention of any environmental incidents.

Well completion activities may be undertaken for up to four wells and (for each well) includes:

• installing the subsea tree
• preparing the wellbore for lower and upper completion installation
• installing the completion equipment
• perforating the production casing
• flowing the well back to surface facilities for clean-up.

The subsea tree is a set of valves and fittings installed directly on top of the wellhead that:

• controls the flow of fluids from the well to subsea production facilities and flowlines
• controls chemical injections
• monitors production
• regulates flow rates with hydraulic valves and chokes.

Well flowback and clean-up will be performed on each well that is to be completed. The flowback fluid is expected to consist of (in order of arrival at the rig-based well test package):

• low density fluid
• completion brine
• drilling fluid filtrate
• reservoir fluids (including hydrocarbon gas, condensate, formation and condensed water)

Depending on the hydrocarbon reservoir and well construction process, there could also be minimal levels of solids such as sand/rock/debris remaining from the drilling process.

Reservoir fluids recovered during well clean-up will be directed to a rig-based well test package where the fluids will be separated, measured and either flared (hydrocarbons) or treated for overboard discharge (non-hydrocarbons) or disposal onshore.

Well interventions are carried out to improve the performance of a well that has not been operating to its potential or requires modification or maintenance. Intervention activities would be carried out to:

• allow additional sub-seabed surface geological zones to produce
• close off zones that are no longer required
• repair or replace downhole completion equipment.

Intervention activities will occur at up to two existing well locations located in petroleum title T/L2 (see map on this page). The activities would include:

• positioning the drilling rig over the existing well and connecting to pre-laid mooring lines and anchors
• installing the BOP
• installing intervention pressure control equipment and de-suspending the well
• accessing a zone of interest and isolating (and potentially reopening) the applicable production zone
• re-suspending the well
• recovering the BOP
• (at the conclusion of the well intervention activities described above) releasing the drilling rig from the mooring spread and leaving the location.

The P&A process is used to:

• close exploration wells that are assessed as unsuccessful immediate after drilling
• decommission operational wells that are no longer commercially viable, or
• remove suspended wells.

Under the Well Completions and Interventions EP, P&A activities might be undertaken at one suspended well that was drilled and suspended in a previous project. This decision has not yet been made by Beach. If undertaken, P&A activities would include installation of multiple cement plugs within the well to permanently seal the well. An additional cement plug would be installed at the seabed and all well casings would be cut and recovered from at least 2 m below the seabed/mudline.

NOPSEMA regulates activities in accordance with the Offshore Petroleum and Greenhouse Gas Storage (Environment) Regulations 2023 (Regulations)[1]. The OGV Project requires Environment Plans (EPs) to be accepted by NOPSEMA before beginning activities. EPs will typically be prepared for different activity phases; in the present case, Beach is preparing one single EP covering the well completions, well interventions, and P&A activities described in this information sheet.

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.

EPs 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 successfully drilled gas wells within the OGV Project that will be developed for production, an Offshore Project Proposal (OPP) is required. Beach has developed an OPP for the OGV Project, completed the Public Comment Period for the OPP and it is currently under assessment by NOPSEMA.

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[1] Under the Offshore Petroleum and Greenhouse Gas Storage Act 2006 (Cth).

EPs include a detailed description of the Environment that May Be Affected (EMBA) by the activities described in the EP. The EMBA is the largest geographic area where operational activities could potentially have a direct or indirect environmental impact under worst-case scenarios.

The EMBA includes both the operational area for activities and a planning area where emergency response plans must be ready for activation in the unlikely event of an accident. The EMBA map can be found on this page.

EMBAs are also used to define the broadest area where environmental values and sensitivities are defined, the potential impacts assessed, and control measures to mitigate these impacts are developed.

The defined EMBA for the Well Completions and Interventions EP include the following marine fauna which may be present in the area at various times during the activities described in the EP:

• 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.

Importantly, Beach will not be conducting regulatory activities within marine parks. However, within the broader planning area for emergencies, there are National Marine Parks and State Marine Protected areas (see map on this page).

Socio-economic and cultural values and sensitivities within the EMBA include:

• Commonwealth managed fisheries, including southern and eastern scalefish and shark, Bass Strait zone scallop fishery and southern squid jig fishery
• Victorian, South Australian and Tasmanian managed fisheries, including rock lobster and giant crab
• Commercial shipping activity
• Offshore Wind Industry
• Subsea cables
• 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
• Significant 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 operational areas and planning areas.

Beach has a proud track record of successful safety and environmental performance, adhering to performance measures set out in EPs and Safety Cases accepted by regulators.

The Well Completions and Interventions EP 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 ‘As Low As Reasonably Practicable,’ known as ALARP, and acceptable levels. They follow the principles of ecologically sustainable development. ALARP 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.

A summary of the key impacts, mitigations and management plans can be found under 'More information' on this page.

The Well Completions and Interventions EP 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 Regulations 2000 (Cth)[1].

These control measures are based on the avoidance of collision or entanglement of marine mammals, reducing vessel speeds, and minimising length and number of anchor lines. The control measures also focus on the reduction of marine noise from vessel and drilling rig activities, so that any noise produced is managed such that biologically important behaviours can continue while the activity is being undertaken.

Dedicated Marine Mammal Observers will be deployed on vessels to advise vessel captains and the drilling rig operator of protected marine mammals near Beach’s activities. All whale sightings will be recorded along with the actions taken to avoid potential impacts.

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[1] Under the Environment Conservation and Biodiversity Protection Act 1999 (Cth)

The Well Completions and Interventions EP activities will occur among commercial Commonwealth and State fisheries zones that cover vast areas. Beach’s activities will require access to relatively small areas within these fishing zones, and then only for short periods of time. The Well Completions and Interventions EP will set out detailed assessment of fisheries and fishing activity that may overlap with 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 EP activities.

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

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

Beach has identified and will consult with relevant First Nations 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 Well Completions and Interventions EP.