WA-10-L, WA-12-L, WA-3-PL (GRIFFIN)DECOMMISSIONING ANNUAL REPORTDecember 2023

GRIFFIN DECOMMISSIONING
PROGRESS REPORTPurpose• all wells were plugged and abandoned;

This annual decommissioning report provides a progress
update on Woodside Energy Global Pty Ltd’s (Woodside)
decommissioning activities for the Griffin Field from 1 January 2023
to 31 December 2023, including planning towards and progress with
undertaking the actions in accordance with the National Offshore
Petroleum Safety and Environmental Management Authority(NOPSEMA) General Direction 832.

• all Xmas trees (XTs) were removed and placed onto mudmats around 25 m from the wells;

Description of Facilities

Title Holders

The Griffin field is located within title areas WA-10-L and WA-12-L,
located around 58 km north-west of Exmouth, Western Australia,
in Commonwealth waters at water depths of approximately
130 metres (m). Woodside operates the titles on behalf of the titleholders.
When in production, the Griffin field comprised the Griffin Venture,
a floating production, storage and offloading (FPSO) vessel,with 12 production wells from the Griffin, Scindian and Chinook
reservoirs routed to the riser turret mooring (RTM) via flexible andrigid flowlines. Oil products were stabilised and stored for offloading via
tanker, while gas products were transported to the shore via the Griffin
gas export pipeline (GEP) for domestic sale.
The Griffin field ceased production in 2009. Since then, the following
cessation activities have been completed:• the Griffin Venture FPSO was disconnected from the RTM anddemobilised from the field;• all flowlines and gas lift lines were flushed and filled withtreated seawater;• the GEP was purged and pressurised with inert gas,for preservation purposes;

Figure 1 – Griffin Operational Area

1 Griffin Decommissioning Annual Report | December 2023

• all mid-depth buoys (MDBs) were removed and recovered.
MDB mooring chains were laid on the seabed at the concrete
gravity bases; and• flexible risers were laid on the seabed.

Following the merger between Woodside and BHP Petroleum on 1 June
2022, the titleholders for WA-10-L and WA-3-PL are Woodside Energy(Australia) Pty Ltd, Mobil Exploration and Producing Australia Pty Ltdand Inpex Alpha, Ltd. The titleholders for WA-12-L are Woodside Energy(Australia) Pty Ltd and Mobil Australia Resources Company Pty Limited.
Woodside Energy Global Pty Ltd is the operator of the titles.
Once accepted by NOPSEMA, all titleholders will publish this report on
their websites.

Legal Obligations
Until such time as decommissioning activities have been completed,
Woodside will maintain property on the titles to ensure removal of
the property is not precluded, as per the Woodside Subsea Integrity
Management Plan.
At the completion of the field decommissioning activities,
Woodside will provide, to the satisfaction of NOPSEMA, for theconservation and protection of the natural resources in the WA-10-L
title area and the make good of any damage to the seabed or subsoil
in the WA-10-L title area caused by any person engaged or concernedi the operations, within 12 months after property is removed.

Decommissioning Progress in 2023
Following on from work commenced in 2021, Woodside is progressing
an Environment Plan Strategy to meet its obligations under theOffshore Petroleum Greenhouse Gas Storage Act. The Strategy separates
Environment Plans based on activity type, complexity and location.
Three Environment Plans have been submitted to NOPSEMA for thedecommissioning of the Griffin field.
The Griffin Decommissioning and Field Management Environment Plancovers the following scope:• remove subsea infrastructure within the Griffin field in title
area WA-10-L;• remove wellheads and associated infrastructure within title areas
WA-10-L and WA-12-L; and• continue field management scopes which comprise inspection,
maintenance, monitoring and repair (IMMR) and remotely operated
vehicle (ROV) surveys on the subsea infrastructure and gas export
pipeline, as required.
The Environment Plan was first submitted to NOPSEMA on 22 December
2021, and further submissions have been made in 2022 and 2023 toaddress NOPSEMA’s Request for Further Written Information (RFFWI).
The Environment Plan was accepted on 21 November 2023.

The Griffin Field Equipment Deviation Environment Plan covers thefollowing scope:• proposal to leave in situ six concrete gravity bases (CGBs), twelve
anchors and five concrete piles cut at or below the mudline,
demonstrating an equal or better environmental outcome which issatisfactory to NOPSEMA;
The first revision of the Griffin Field Equipment Environment Plan wassubmitted in March 2022. The Environment Plan was resubmitted to
NOPSEMA in December 2023.
In addition to the development of the regulatory permissioning
documents informing the scope, the following pre-execution activities
were completed:• Completed pre-execution survey of field equipment in July 2023 toconfirm equipment status;• Submission and acceptance of all Commonwealth and State facility
safety cases;• Acceptance of Griffin Decommissioning and Field Management EP;• Submission of Griffin Gas Export Pipeline Decommissioning EP; andThe Griffin Gas Export Pipeline Decommissioning Environment Plancovers the following scope:• Mobilised vessels to region for RTM removal and in readiness for
in-field decommissioning activities and unable to undertake activities
due to additional consultation requirements associated with changes
in law (Santos NA Barossa Pty Ltd v Tipakalippa Federal Courtdecision) resulted in delays in EP acceptance.

• pig the gas export pipeline (GEP) to prepare for pipeline removal
in Commonwealth waters; andDecommissioning Plan in 2024

• remove the GEP within Commonwealth waters.
The first revision of the Griffin GEP Decommissioning Environment Plan
outlined a leave in situ option for the pipeline and was submitted inFebruary 2022. Following regulatory feedback relating to the long termfate of the pipeline, and the timeframes described in the General Direction
832, the Environment Plan is being updated to enable removal activities.
Further assessment will be undertaken post removal to better understandthe effects that the production has had on the pipeline in order to support
future decommissioning activities in the region. Woodside will continue
to assess decommissioning options on a case by case basis, informed byscience and consultation. The Environment Plan was accepted on30 November 2023.

2 Griffin Decommissioning Annual Report | December 2023

It is anticipated that acceptance of the outstanding Environment Plans
will occur in 2024. In addition, Woodside will progress other necessary
approvals such as Sea Dumping Permits, as applicable.
During 2024, the following activities are planned:• Commence and complete in-field decommissioning activities; and• Closure of Directions 1 and 2 of General Direction 832.

General Direction 832
DirectionKey Tasks

Progress in CY 2023

Direction 1• EP development,
concept studiess• 2 EPs accepted and 1 EP submitted• Decommissioning andField Management
EP submission andacceptance• Additional consultation
requirements associated withchanges in law (Santos NA Barossa
Pty Ltd v Tipakalippa Federal Courtdecision) resulted in delays inEP acceptance• Deviation EP submissionand acceptance• Griffin Field Equipment
Deviation EP to be submitted
in December 2023

Remove, or cause to be removed, to thesatisfaction of NOPSEMA, from the title
area all property brought into that areaby any person engaged or concerned in
the operations authorised by the title assoon as practicable and no later than 31
December 2024.

• Environment Plan Strategy and endstates for equipment finalised

Look-aheadfor CY 2024
• Progress acceptanceof Griffin Field
Equipment Deviation
Environment Plan

• Progression of technical studies
to support deviation scopes(contaminants analysis)• Development ofother regulatory
permissioning
documents• Continued engagement withDCCEEW regarding Sea
Dumping Permits• Progress Sea Dumping
Permits for Griffin pilesand CGBs

• Submission of Griffin Gas Export
Pipeline (State) EP for assessment
on 27 October 2023

• Progress acceptance ofEP for Griffin Gas Export
Pipeline (State) End State
with DMIRS• Submission and acceptance ofSafety Case updates• Contract award, detailed
design progression,
field execution activities• Pre execution survey activities
completed July 2023

• Complete removalactivities in field• Mobilised Light Construction
Vessel for in-field activities
and demobilised vessel due
to additional consultation
requirements associated withchanges in law (Santos NA Barossa
Pty Ltd v Tipakalippa Federal Courtdecision) resulted in delays inEP acceptance• Re-contract HLV andsupport vessels for
RTM removal• Mobilised Heavy Lift Vessel (HLV)
and support vessels for in-field
activities and demobilised vessel
due to additional consultation
requirements associated withchanges in law (Santos NA Barossa
Pty Ltd v Tipakalippa Federal Court
decision) resulted in delays in
EP acceptance• Commenced field execution
activities with the Technip FMC
Deep Orient in December 2023
Direction 2
Until such time as direction 1 arecomplete, maintain all property on thetitle to NOPSEMA’s satisfaction, to ensure
removal of the property is not precluded.

Direction 3Provide, to the satisfaction of NOPSEMA,
for the conservation and protection of thenatural resources in the title area within
12 months after property referred to indirection 1 is removed.

• EP development
and submission• Decommissioning and Field
Management EP accepted,
detailing ongoing fieldmanagement activities• Integrity of the subsea
infrastructure will be managed
as outlined in the Griffin Subsea
Integrity Management Plan

• EP development
and submission

3 Griffin Decommissioning Annual Report | December 2023

• Acceptance of theDecommissioning and Field
Management EP which details
conservation and protection
measures and how therequirements of section
270 will be met• Progress surveys, fieldmanagement activities
as per accepted
Decommissioning andField Management EP• Progress surveys, fieldmanagement activities
as per accepted
Decommissioning andField Management EP

Look-ahead
for CY 2024

Direction

Key Tasks

Progress in CY 2023

Direction 4• EP developmentand submission• Acceptance of theDecommissioning and Field
Management EP which details
Make Good monitoring anddetermination measures andhow the requirements of section
270 will be met• Progress surveys, fieldmanagement activities
as per accepted
Decommissioning andField Management EP• Annual Progress report• 2023 annual report submitted
December 2023

• Submit annual progress
report in December 2024

Make good, to the satisfaction ofNOPSEMA, any damage to the seabedor subsoil in the title area caused by any
person engaged or concerned in theoperations authorised by the title within
12 months after the property referred to in
Direction 1 is removed.
Direction 5
Annual progress reporting until all
directions have been met.

Schedule
An indicative schedule of the decommissioning activities is provided below:

Feedback
If you would like to comment on the proposed activities outlined in this information sheet,or would like additional information, please contact Woodside via:
E: Feedback@woodside.com
Toll free: 1800 442 977

www.woodside.com