1 Woodside Activity Update June 2017 | Exmouth Plateau, North-West Western Australia

WA-404-P EXPLORATION AND APPRAISAL DRILLING

EXMOUTH PLATEAU, NORTH-WEST WESTERN AUSTRALIA

Woodside Activity Update June 2017

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+ Woodside is preparing an Environment Plan to undertake drilling activities within the WA-404-P permit area.

+ The Environment Plan is for up to six wells, one of which is a firm well, the remaining five are contingent wells.

+ Proposed drilling activities are scheduled to commence as early as Q1 2018.

+ The proposed petroleum activities program is located in Commonwealth waters, approximately 260 km north-west of Dampier, Western Australia.

2 Woodside Activity Update June 2017 | Exmouth Plateau, North-West Western Australia

Activity LocationThe proposed petroleum activities program is located in Exploration Permit Area WA-404-P, in Commonwealth waters approximately 260 km north-west of Dampier (Figure 1). The closest landfall to the permit area is the Montebello Islands which is approximately 138 km south at the closest point.

The permit area is located outside of any established and proposed Commonwealth and State Marine Protected Areas, and outside of established shipping fairways. The Petroleum Activities Program is planned to be undertaken in an area of low environmental sensitivity with no Critical Habitats or Threatened Ecological Communities, as listed under the EPBC Act, present in the permit area.

A 500 m radius exclusion zone will be in place around the drilling locations for the duration of the drilling program.

Approximate location details for the Petroleum Activities Program are provided in Table 1.

Activity Duration The proposed Petroleum Activities Program is scheduled to commence as early as Q1 2018. Drilling of the Ferrand and other wells is expected to take approximately 90-120 days per well (including mobilisation, demobilisation and contingency and excluding well testing activities) to complete. There are no planned concurrent drilling activities under this program.

Timing and duration of these activities is subject to change due to project schedule requirements, moored mobile offshore drilling unit (MODU) / vessel availability, unforeseen circumstances and weather.

Work will be carried out in the field – 24 hours a day, seven days per week except where controls developed in the Environment Plan or associated safety case require otherwise.

Activity Details Exploration and appraisal wells are used to explore for new accumulations of oil and gas. Critical information that helps geoscientists and engineers better understand the subsurface are acquired.

The proposed wells will be drilled in many phases.

The first phase is called ‘spudding’. This is where a hole will be drilled and a conductor casing will be cemented into the ocean floor. Next, the well will be drilled down from inside the casing to the desired depth. The well will then be cased and cemented to prevent the hole from collapsing and contain formation pressure. This process of drilling and casing continues as required until reaching the target reservoir.

During drilling, drilling fluids will be injected into the well which helps to consolidate the walls of the well and help bring rock samples back to the surface.

To prevent water, oil or gas from flowing out of the well, a blow-out preventer (BOP) is installed on top of the wellhead. The BOP is used for controlling and monitoring the well during drilling operations. A marine riser will also be installed to provide a physical connection between the well and MODU.

At the end of this exploration and appraisal drilling activity, the wells will be abandoned by plugging with cement in multiple locations to create barriers within the well and make the well safe.

Following this, the marine riser and BOP will be removed and the wellhead assembly will be cut off below the seabed and retrieved, unless recognised removal techniques are ineffective (management as per the Environment Plan).

Vessels and Drill Rig Drilling will be undertaken by a semi-submersible moored mobile offshore drilling unit (MODU) or Dynamically Positioned (DP) MODU. Support and other vessels will be required for the duration of the drilling activities.

Support vessels are used to transport equipment and materials between the MODU and Dampier port. One vessel will be present at the MODU or DP MODU on standby at all times and others will transit out of the Operational Area to Port for emergency and non-routine operations.

The assignment of a DP MODU and/or MODU and support vessels has not been made at the time of publication.

Activity overview

+ Woodside is preparing an Environment Plan (EP) to undertake drilling activities within the WA-404-P permit area.

+ The EP is for up to six wells, one of which is a firm well, the remaining five are contingent wells.

+ The permit area is located in Commonwealth waters, approximately 260 km north-west of Dampier offshore Western Australia.

+ The firm well proposed for drilling within permit area WA-404-P is the Ferrand exploration well.

+ Detailed planning and scheduling of the Ferrand exploration well is currently being undertaken, with the remaining wells to be planned pending outcomes of Ferrand or as required under Exploration Permit Area requirements issued under the Offshore Petroleum and Greenhouse Gas Storage (Environment) Regulations 2009 (Cth) (OPGGS Act). When timing of the contingent wells is known and rig activities confirmed, stakeholder consultation and notification will occur as per the National Offshore Petroleum Safety and Environmental Management Authority (NOPSEMA) approved approved Environment Plan.

+ The proposed activities are scheduled to commence as early as Q1 2018.

About the consultation

ActivityWater Depth (approximate

m LAT)Latitude Longitude

Production Licence

Ferrand Exploration Well

1,494 mProposed well location

WA-404-P

19°15’40”S 114°29’59”E

Exploration wells 2 and 3

Appraisal wells 1 - 3

1,100m – 1,600m

Permit boundary19°9’53”S 114°20’4”E19°9’53”S 114°35’2”E

19°29’54”S 114°35’2”E19°29’54”S 114°15’5”E19°24’55”S 114°15’5”E19°24’55”S 114°10’4”E19°14’53”S 114°10’4”E19°14’53”S 114°20’3”E

Table 1: Approximate location details for the Petroleum Activities Program

3 Woodside Activity Update June 2017 | Exmouth Plateau, North-West Western Australia

Woodside has a long history of safely and successfully drilling exploration, appraisal and production wells in offshore Western Australia.

Woodside has undertaken an environmental risk assessment for the proposed drilling program, considering timing, duration, location and potential environmental impacts arising from drilling activities. As a result, a number of mitigation and management measures will be implemented during the proposed drilling program.

Table 2 provides a summary of potential key risks and associated management measures identified for the proposed WA-404-P exploration and appraisal drilling program which will be further detailed and developed in the activity Environment Plan.

Environmental management

Table 2: Summary of potential key risks and associated management measures identified for the WA-404-P exploration and appraisal drilling program

Potential Risk and/or Impact Mitigation and/or Management Measure

Vessel collision

+ Marine notifications will be made to relevant stakeholders, describing the location of the activity and a 500 m exclusion zone to prevent the risk of vessel collisions.

+ An activity support vessel will be on standby during the drilling activities as required by the MODU Safety Case.

Marine fauna interactions

+ Measures will be taken to protect marine fauna and ecosystems from vessel activities and to prevent vessel collisions.

Effluent discharge and waste management

+ Routine discharges will meet legal requirements.

+ Other wastes will be transported back to shore for appropriate recycling/disposal.

Hydrocarbon release

+ Appropriate spill response plans, equipment and materials will be in place and maintained.

+ Appropriate refuelling procedures and equipment will be used to prevent spills to the marine environment.

Exclusion zones for marine users

+ A 500 m radius exclusion zone will be in place around the MODU for the duration of the drilling program.

+ Woodside also requests marine users observe a 4,000 m radius precautionary zone for safety reasons. Vessels may enter this zone however extra vigilance is required due to possible presence of moorings and a higher level of MODU related activities/vessel traffic.

4 Woodside Activity Update June 2017 | Exmouth Plateau, North-West Western Australia woodside.com.au

Providing Feedback If you would like to comment on the proposed activity outlined in this fact sheet or would like additional information, please contact Woodside before 26 July 2017.

Felicity Kalani Corporate Affairs AdviserWoodside Energy LtdP: (08) 9348 5097E: feedback@woodside.com.auToll free: 1800 442 977

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Environmental approvals

An Environment Plan for the proposed wells will be submitted to the National Offshore Petroleum Safety and Environmental Management Authority (NOPSEMA) for acceptance in accordance with the Offshore Petroleum and Greenhouse Gas Storage (Environment) Regulations 2009 (Cth).

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=

MurionIslands

BarrowIsland

Ferrand-A19°15'40.415"S114°29'59.935"E

Gascoyne

Montebello

Dampier

Ningaloo

WA-404-P R1

KARRATHA

117°E116°E115°E114°E

19°S

19°S

20°S

20°S

21°S

21°S

0 40 80

kilometres

°

Plot Scale @ A3.

19/06/2017 / DRIMS-#1400379412

Legend

= Proposed Well Ferrand-A

Operational Area 4km radius

Woodside Title - Operator

Location of additional exploration/appraisal wellsWA DEC land and marine parks

Marine Management AreaMarine Park

Commonwealth Marine Reserves Network

Marine National Park Zone (IUCN II)Recreational Use Zones (IUCN II and IV)Habitat Protection and Conservation Park Zones (IUCN IV)Multiple Use Zone (IUCN VI)

CRS: WGS 841:1,250,000

Location Map

Please note that stakeholder feedback will be communicated to NOPSEMA as required under legislation. Woodside will communicate any material changes to the proposed activity to affected stakeholders as they arise. Proposed timing for the activity may be subject to change.

Figure 1: WA-404-P location