PLUTO OFFSHORE FACILITY OPERATIONS

Transcription

1 Environment Plan April 2018 CARNARVON BASIN, NORTH-WEST AUSTRALIA PLUTO OFFSHORE FACILITY OPERATIONS Key Information ++ Woodside is submitting a revised Environment Plan for the Pluto Offshore Facility Operations in accordance with the Offshore Petroleum and Greenhouse Gas Storage (Environment) Regulations 2009 (Cth) (the regulations). ++ The regulations require that the Environment Plan be revised at least every five years. ++ The Pluto Offshore Facility s current operations Environment Plan (EP) was accepted by the National Offshore Petroleum Safety and Environmental Management Authority (NOPSEMA) in Woodside Environment Plan Pluto Offshore Facility Operations

2 About the operations Background The Pluto Offshore Facility, which has been operating since 2012, is a facility comprising the Pluto offshore platform and associated wells and subsea infrastructure. The Pluto Offshore Facility is operated by Woodside on behalf of joint venture participants Kansai Electric (5%) and Tokyo Gas (5%). Activities Activities undertaken as part of the scope of the Environment Plan include: + + Unmanned production. The Pluto Offshore Facility operates as not normally manned and is controlled from the onshore Pluto Gas Plant near Karratha. Under the Environment Plan, operations include production of hydrocarbons from the reservoirs, receiving hydrocarbons at the Pluto Platform and transport via the trunkline to the onshore facility for processing. + + Manned maintenance and production. Maintenance on the facility is undertaken on a regular basis to conduct inspections and repairs, with the aim of maintaining safe and reliable unmanned production. + + Projects. The proposed installation and commissioning of the water treatment module will be included in the scope of the Environment Plan. Additional project activities may be required for the purposes of refurbishment, modification or major maintenance on the facility. If a project scope has the potential to result in significant change to the facility, or has potential environmental or social impacts, an assessment of whether an EP revision is required will be undertaken. The Pluto Offshore Facility currently produces gas and condensate from the Pluto and Xena gas fields which is transported via a 36-inch 180 km trunkline to the onshore Pluto Gas Plant for processing and export to customers. The revised EP will account for production from the Pluto, Xena and Pyxis fields, located in Production Licence WA-34-L. Woodside proposes to produce from the Pyxis gas field within the five year duration of this EP via a subsea tieback. The proposed wells and subsea infrastructure will lie within the WA-34-L permit area. Drilling and installation activities associated with this tieback will be subject to a separate EP. The installation and commissioning of a produced water treatment module will also be included in the scope of the revised EP. Woodside proposes to install the water treatment module on the Pluto Platform using a heavy lift vessel. The facility will be capable of treating up to 3,500 m3/day of produced water. Operations The Pluto Platform is 211 m tall and is operated as a Not Normally Manned (NNM) facility with remote operations from a fixed operator console at the Pluto onshore Central Control Room which is constantly manned. The platform combines accommodation and utilities but not processing facilities. The Pluto offshore facility is supported on a four legged jacket, with foundations secured by 12 drilled grouted piles which support the structure and withstand cyclonic conditions. The Operational Area defines the spatial boundary of Pluto Offshore Facility operations, this area includes a 500 m petroleum safety zone around the Pluto Platform, a 1,500 m area around pipelines, flowlines and the entire area of Production Licence WA-34-L. The Pluto platform and surrounding 500 m petroleum safety zone is marked on nautical maps, vessels are prohibited from entering the petroleum safety zone without written consent. 2 Woodside Environment Plan Pluto Offshore Facility Operations

3 About the operations Location The Pluto Platform is located in Commonwealth waters approximately 174 km north-west of Karratha, adjacent to the Multiple Use Zone of the Montebello Commonwealth Marine Reserve and 80 km north of the Lowendal Islands Nature Reserve. It stands in a water depth of 85 m. A location map is provided in Figure 1. The revised EP will incorporate the operation of: + + the Pluto Platform situated in Infrastructure Licence WA-1-IL; + + wells and associated subsea infrastructure located in Production Licence WA-34-L; and + + pipelines and flowlines located in Pipeline Licences WA-16-PL and WA-17-PL. For further details on subsea infrastructure please refer to Table 1. Table 1: Summary of Pluto Offshore Facility details Location Key components of facility No. of wells Current production capacity Commissioned 2012 Water Depth Coordinates Current Pipeline details 174 km north-west of Karratha, Western Australia Fixed platform, pipelines and processing equipment Approval for 12, currently 7 in place 20,500 tonnes of gas 8,996 bbls of condensate 85 m Pluto Platform Long E Lat S Pluto B Flowlines WA-16-PL Pluto Trunkline (Commonwealth) WA-17-PL Figure 1: Location of the Pluto Offshore Facility 3 Woodside Environment Plan Pluto Offshore Facility Operations

4 Environmental Management Woodside has undertaken an environmental risk assessment for the proposed activities during Pluto Offshore Facility operations, considering timing, duration, location and potential environmental impacts and risks. As a result, a number of management measures will be implemented during the proposed activities to reduce the impacts and risks to as low as reasonably practicable and to an acceptable level. Table 2 provides a summary of potential key environmental risks and associated management measures identified for Pluto Offshore Facility operations. Table 2: Summary of potential key risks and associated management measures for the Pluto Offshore Facility operations All potential risks or impacts will be managed to meet legal requirements. Table 2 lists specific management measures being applied. Potential risk and/or impact Routine marine discharges Waste generation Management Measures + + All routine marine discharges (drainage water, produced water, cooling water and sewage/ grey water) will be managed according to legislative requirements and Woodside s Environmental Performance Standards where applicable. + + Waste generated on the facility will be managed in accordance with legislative requirements and Woodside s Waste Management Plan. + + Wastes will be managed and disposed of in a safe and environmentally responsible manner that prevents accidental loss to the environment. + + Wastes transported onshore will be sent to appropriate recycling or disposal facilities by a licensed waste contractor. Flaring Emissions from fuel combustion Uncontrolled Hydrocarbon release Chemical use Marine fauna interactions Introduction of invasive marine species + + Gas flaring will be managed to a level required for safe and reliable production. + + Unplanned flaring will be minimised where possible and managed in accordance with annual performance targets. + + Procedures to keep emissions from combustion of fuel (e.g. power generation) in line with design specifications will be followed. + + Fuel gas is the preferred source of fuel. Emissions will be reported in accordance with regulatory requirements. + + Procedures to reduce the potential for uncontrolled hydrocarbon releases will be followed. + + Appropriate fuel transfer procedures and equipment will be used to prevent spills to the marine environment. + + Appropriate spill response plans, equipment and materials will be in place and maintained to manage any potential spills to the environment. + + Chemical use will be managed in accordance with Woodside s Chemical Selection and Approval Procedure. + + Measures will be taken to protect marine fauna from vessel activities. + + All vessels will be assessed and managed as appropriate to prevent the introduction of invasive marine species. 4 Woodside Environment Plan Pluto Offshore Facility Operations

5 Environmental Management Approvals The revised Pluto Offshore Facility Operations Environment Plan 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 As per the requirements of the Petroleum (Submerged Lands) (Environment) Regulations 2012 (WA) an Environment Plan is required for Petroleum Activities undertaken in State Waters. This is the subject of a separate plan addressing the relevant activities (e.g. the pipeline to shore) and does not form part of the scope of the Pluto EP. Providing Feedback Erin Chen-Wilson Corporate Affairs Adviser Woodside Energy Ltd T: (08) E: Feedback@woodside.com.au Toll free: 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. 5 Woodside Environment Plan Pluto Offshore Facility Operations woodside.com.au