3 PROjecT descRiPTiOn enter here Back to contents sUPPLeMenTARy RePORT TO THe eis Arrow Bowen Gas Project SREIS Section 3 Project Description 3 Project Description 3.1 Overview A conceptual description of the Bowen Gas Project (the Project) was prepared to inform the EIS. The project description formed the basis for which all initial baseline environmental studies were undertaken and guided the approach for how impact assessment studies were conducted for the EIS. Since publication of the EIS for public comment in Q1 2013, Arrow’s field development plan and conceptual design for the Project has advanced. This progression is the result of ongoing exploration activities that have improved Arrow’s understanding of the gas resource, and the evolution of Arrow’s planning and operational processes. Refinements to the basis of design, including revised typical arrangements, configurations, construction methods and CSG infrastructure design are being undertaken by Arrow to prepare for the front-end engineering design (FEED) phase and incorporate new design elements to improve efficiencies and reduce the Project’s disturbance footprint. Table 3-1 below presents the changes that have occurred to the project description subsequent to publishing the EIS. Where the changes to Project elements are described in more detail within this chapter a cross reference to the relevant section is provided in the table. Prepared for Arrow Energy Pty Ltd 3-1 42627140 Arrow Bowen Gas Project SREIS Section 3 Project Description Table 3-1 Project Changes Since Release of the EIS EIS Section EIS Project Description Description of Change (in Supplement) 4.3 – Major Infrastructure Components Integrated processing facility (IPF) – to treat (dehydrate) and The term IPF is no longer being used and is now compress the gas to export pressure, and treat water for incorporated into central gas processing facilities (CGPF). beneficial use. Water treatment facilities (WTFs) will be co-located at CGPFs. Simply a change to naming convention. 4.3.1 – Production Facilities For the purpose of the EIS, production facility locations were Due to expected low gas pressures, as a result of the assumed to be located somewhere near the centre of each preliminary engineering undertaken in the concept select development area (17 in total) of 12 km radius. phase, the number of development (or drainage) areas has The indicative layout of production facilities across the increased to 33 in total, however; each of these drainage Figure 4-4 Indicative Facilities Layout Project area were presented in Figure 4–4 of the EIS. areas now represent an approximate 6 km radius catchment area for gathering well production (gas and water), and distributing to surface production facilities located at or near the centre of drainage area. These 33 drainage areas will be developed over the Project life, however; Arrow does not expect all facilities to be operating together at one single time. See Figure 3–1. The number and location of development areas has been revised – this influences the indicative location of facilities. This change is now presented in Figure 3–1. 4.3.1.1 – Facility Gas Compression Detailed information in Table 3-2 outlines a comparison See Table 3–2 for a comparison between compression types between compression types presented in the EIS and the presented in the EIS and the new case for the SREIS. new case for the SREIS. Table 4-2 Production Facility Compression Types 4.3.1.1 – Range of Facility Sizes Production facility area requirements: Production facility area requirements: Table 4-3 Production Facility Area • FCF = 200 x 250 m; • FCF = 200 x 380 m (maximum size); and Requirements • CGPF = 600 x 250 m; and • CGPF = 500 x 250 m + up to 0.6 km2 for dams • IPF = 800 x 250 m + up to 1 km2 for dams. (dimensions are provisional, may vary following design review). Prepared for Arrow Energy Pty Ltd 3-2 42627140 Arrow Bowen Gas Project SREIS Section 3 Project Description EIS Section EIS Project Description Description of Change (in Supplement) 4.3.1.2 –Field Compression Facilities Field compression facilities (FCF) were to be installed to FCFs will be installed to boost the gas pressure and enable boost the gas pressure to enable transportation of the gas transportation of the gas over long distances. over long distances. FCFs will also now include a water transfer station (WTS) to facilitate transfer of water from FCF to FCF en route to a CGPF. 4.3.1.2 – Field Compression Facilities Previously electrical power was to be reticulated to an FCF It is presently anticipated that electrical power will be from the nearest CGPF or IPF. reticulated to FCFs from a central location, which will be the CGPFs for Phase 1 of the development, and strategic FCFs for subsequent phases. An FCF will receive high voltage power via Arrow owned 66 kV distribution network from where the voltage is stepped- down to 11 kV for distribution to users within the facility and to wellhead facilities. See Section 3.6. 4.3.1.2 – Field Compression Facilities At an FCF, water was to be received from the local At an FCF, water will be received from the local production production area gathering systems, collected in a storage area gathering systems, collected in storage tanks, and tank, and pumped to the closest IPF. pumped to another FCF or to a CGPF, whichever is the closest. 4.3.1.3 – Central Gas Processing Facilities Gas was to be compressed to reach a high pressure (10,200 The gas will be compressed to reach high pressure (10,200 to to 15,000 kPag). 13,500 kPag) - see Table 3–2. 4.3.1.3 – Central Gas Processing Facilities A combination of screw and reciprocating compression Centrifugal compressors are proposed to be used as part of was assumed as the reference case for the EIS. the SREIS case - see Table 3–2. 4.3.1.3 – Central Gas Processing Facilities Gas flows at the Project’s CGPFs were likely to range Peak installed capacity at the CGPFs is likely to be between between 60 and 210 TJ/d. 360 TJ/d to 450 TJ/d - see Table 3–2. 4.3.1.3 – Central Gas Processing Facilities The gas was to be received at the facility at a controlled The gas will be received at the CGPF from the FCFs at a pressure of approximately 40 kPag at the inlet manifold controlled pressure of approximately 3,100 kPag at the inlet and 30 kPag at the suction to compression. manifold and 3,000 kPag at the suction to compression. Prepared for Arrow Energy Pty Ltd 3-3 42627140 Arrow Bowen Gas Project SREIS Section 3 Project Description EIS Section EIS Project Description Description of Change (in Supplement) 4.3.1.3 – Central Gas Processing Facilities A slug catcher will separate any bulk water in the gas before Any bulk water in the gas is separated in a slug catcher it is directed to the first stage of compression. before the gas is directed to the first stage of compression. Water collected at the slug catcher will be collected in the utility dam to avoid contaminating the WTF with the corrosion inhibitor. See Section 3.4. 4.3.1.3 – Central Gas Processing Facilities At a CGPF, water was to be received from the local At the co-located WTF, produced water will be collected, production area gathering systems, or from gathering treated and then stored onsite for distribution to the end user, systems of adjacent production areas via low pressure which may include irrigation, mine wash water, water utility trunklines. The water was to be collected either in a utility company or town water supply. dam or tank and pumped, via a WTS to an IPF. Further details are provided in Section 3.4 4.3.1.4 – Integrated Processing Facilities Integrated processing facilities (IPF). The term ‘IPF’ is no longer being used for the SREIS case. WTFs will now be co-located with the CGPFs not at the previously named IPFs. See Section 3.4. 4.3.2 – Production Well Development Up to 6,625 production wells were expected to be drilled Approximately 4,000 production wells will be drilled throughout the Project area over the approximate 40 year throughout the Project area over life of the Project (up to 40 Project life to maintain gas supply to the LNG plant. years) to maintain gas feed to the LNG plant. 4.3.2 – Production Well Development Surface-in-seam (SIS) chevron wells in a dual lateral Currently, development plans involve drilling and completion configuration were proposed to be used on a nominal 800 m of two base case well types: grid pattern. • Multi Branch Laterals (MBLs): multi branched horizontal Multi-seam hydraulically fractured: vertical, cased and wells drilled in-seam to intersect a vertical producer; and Figure 4-6 Indicative SIS Well Schematic cemented wells, which are perforated and fracture-stimulated • Multi-seam hydraulically fractured: vertical, cased and to provide formation access. It was proposed that up to 25% cemented wells, which are perforated and fracture- of wells developed could potentially be hydraulically stimulated to provide formation access. As with the EIS, it fractured. is proposed that up to 25% of wells developed could The indicative layout of the SIS chevron well was presented potentially be hydraulically fractured. in Figure 4-6. See Section 3.3, Figures 3-2 to 3-4 show the layout of the MBL wells. Prepared for Arrow Energy Pty Ltd 3-4 42627140 Arrow Bowen Gas Project SREIS Section 3 Project Description EIS Section EIS Project Description Description of Change (in Supplement) 4.3.2 – Production Well Development No reference in the EIS Project Description chapter (Section Groundwater monitoring bores in accordance with Arrow’s 4) to groundwater monitoring bores. statutory obligations (see Section 3.3.3) 4.3.3.1 – Surface-in-seam Chevron Wells A horizontal, SIS, dual-lateral in a chevron configuration. This A horizontal MBL well. design included two production laterals per well (and A multi-well pad will be comprised of either 4 wells (2 vertical therefore requires that three holes are drilled, from three production conduits plus 2 lateral wells), 8 wells (4 vertical separate surface locations, to provide one “dual lateral production plus 4 lateral) or 12 (6 vertical production plus 6 producer”). lateral) wells. See Section 3.3.1 for further details on layout and configuration of wells. 4.3.3.1 – Surface-in-seam Chevron Wells On a nominal 800 m grid pattern, an indicative density of one Wells will be clustered together onto common well pads, producer well per 160 to 320 acres (65 to 130 ha) was wherever possible. typically expected. See Section 3.3.1. 4.3.3.1 – Surface-in-seam Chevron Wells During the drilling phase, each well pad was to occupy an During the drilling phase, the estimated multi-well pad area area of 8,100 m2 (90 m x 90 m) such that for each SIS dual- will be 130 m x 175 m (4 wells pad), 130 m x 235 m (8 wells lateral producer, the required collective well pad area (for the pad) and 130 m x 295 m (12 wells pad). three separate pads) was to be 24,300 m2. See Section 3.3.1. 4.3.3.1 – Surface-in-seam Chevron Wells Once the well is installed, the footprint was to be reduced to The area required for drilling is only temporary; post drilling, approximately 10 m x 10 m such that for each SIS dual- the site can be rehabilitated down to the area required for the lateral producer, the required collective well pad operational operational footprint. The estimated operational footprint is area (for the three separate pads) would be approximately 17 100 m x 155 m (4 well pad), 100 m x 215 m (8 well pad) and m x 17 m. 100 m x 275 m (12 well pad). See Section 3.3.1. 4.3.3.2 – Multi-seam Hydraulically During the drilling phase each well pad would occupy an area During the drilling phase each single-well pad may occupy an Stimulated Vertical Well of approximately 8,100 m2 (90 m x 90 m). area of 16,900 m2 (130 m x 130 m). See Section 3.3.1. Prepared for Arrow Energy Pty Ltd 3-5 42627140 Arrow Bowen Gas Project SREIS Section 3 Project Description EIS Section EIS Project Description Description of Change (in Supplement) 4.3.5 – Power Generation and Distribution Integrated power generation was presented as the preferred Power supply from the grid is the base case for the SREIS. option to supply power to the production facilities in the EIS. Integrated power generation is considered a temporary alternative if grid connection is not completed on time. Under this option, it is proposed to develop temporary power generation utilising CSG as a fuel source at selected CGPFs and FCFs as required for approximately two years of the initial development. See Section 3.6 of this report for the revised description of electricity supply for the Project. 4.3.7 – Water Treatment and Storage Total associated water volume to be extracted over the life of Estimated total water produced is 153 GL Facilities the Project is estimated at approximately 264.3 GL (over 40 Average production = 4.25 GL/a (average is over 36 years) years) Peak production = 10.4 GL/a Average production = 7 GL/a Peak production = 10 GL/a 4.3.7 – Water Treatment and Storage The term ‘IPF’ was used in the EIS to describe the facility that For the SREIS, the term ‘IPF’ is no longer considered and the Facilities would contain both gas compression and processing WTFs will be co-located with the two CGPFs with the equipment and also a WTF. potential of a third WTF to be constructed near Blackwater. The EIS presented the following dam sizes (per WTF): As part of the SREIS reference case and for planning • Aggregation dam – 600 ML purposes, the following preliminary dam sizing (per WTF) has been adopted (based on a nominal facility throughput of 20 • Treated water dam – 600 ML ML/d): • Brine dam (x2) – 960 ML • Associated water storage (feed) dam – 400 ML (providing a minimum of 20 days storage) • Clear (treated) water dam – 600 ML • Brine storage dam(s) – 1,800 ML See Section 3.4 of this report for further detailed information on changes to the WTFs. 4.3.10 – SCADA and Telecommunications The High Speed Backbone Network (HSBN) was to The HSBN will interconnect the FCFs and CGPFs as well as interconnect the FCFs, CGPFs and the IPFs as well as extending into the well fields. extending where required into the well fields. Prepared for Arrow Energy Pty Ltd 3-6 42627140 Arrow Bowen Gas Project SREIS Section 3 Project Description EIS Section EIS Project Description Description of Change (in Supplement) 4.3.10 – SCADA and Telecommunications The HSBN was to be implemented by either buried fibre optic The HSBN will include buried Fibre Optic Cable and cable or microwave links. Microwave Radio links. Fibre optic cables were also to be assessed for use within Where practical, the fibre optic cables will be placed in the upstream facilities to reduce site cabling installations. same easement as the low pressure gas gathering pipelines and medium pressure infield pipelines. Arrow communications tower specifications are for long term free standing towers. Arrow towers meet CAA guidelines. Depending on the geography they range in height from 65 m to 100 m conceptually. It is estimated there would be 4 towers. See Section 3.8.5. 4.3.11.1 - Depots Depots were proposed to be located at four IPF facilities – Depots (including storage yards) will be located adjacent to see Figure 4-9 of the EIS. the two CGPFs. 4.3.11.2 – Accommodation Facilities Accommodation for the construction and operation workforce It is currently envisaged that purpose-built accommodation of the Project was expected to include a combination of will be constructed as follows: temporary workforce accommodation facilities (TWAFs) and • Two main villages located near the CGPFs. permanent housing. • To reduce driving distances and its associated risks, These accommodation facilities were expected to be located several smaller temporary villages (currently estimated to in the vicinity of an IPF. be four) are expected to be required when the facilities associated with the drainage area furthest away from the CGPFs are under construction. As the majority of the operations and maintenance personnel are expected to be sourced from outside the Project area, accommodation villages co-located with the Central Operating Bases (COB) will be built to house the Project personnel. See Section 3.9 of this report for details on the revised workforce and accommodation strategy. Prepared for Arrow Energy Pty Ltd 3-7 42627140 Arrow Bowen Gas Project SREIS Section 3 Project Description EIS Section EIS Project Description Description of Change (in Supplement) 4.3.11.3 – Borrow Pits The Project construction and operations activities will require The Project construction activities will require crushed rock, foundation aggregate for construction of camps, roads and gravel, sand and soil for construction of roads and tracks, production facilities. production facilities and accommodation camps. The materials will be purchased from commercial quarries and / or borrow pits on Arrow land will be developed. 4.3.11.3 – Borrow Pits (Concrete) No mention in EIS Project Description of concrete. Concrete required for the construction of the facilities will be sourced from local suppliers. Temporary batching plants will be established as necessary for areas that are remote from fixed plants. 4.3.12 - Workforce Peak total Project workforce was expected to occur in The daily construction workforce is expected to peak at September 2016 with 1,760 personnel. Two smaller peaks around 2,450 personnel in 2018. From 2017 to 2019 the were expected to occur in December 2019 with 1,342 average daily workforce is expected to be over 1,000 personnel and in May / June 2046 with 1,300 personnel. personnel which coincides with the construction of the two CGPFs and the Phase 1 FCFs. The average daily construction workforce will reduce to around 500 to 900 personnel from 2020, after which it will further reduce to 400 or less personnel from 2028 onwards. See Section 3.9 for further details. 4.3.13 – Workforce Accommodation Workforce accommodation was assumed to be co-located It is currently envisaged that purpose-built accommodation with the IPFs. will be constructed as follows: • Two main villages located near the CGPFs; and • Several smaller temporary villages (currently estimated to be four) are expected to be required when the facilities associated with the drainage area furthest away from the CGPFs are under construction. See Section 3.9 of this report for details on the revised accommodation strategy. Prepared for Arrow Energy Pty Ltd 3-8 42627140 Arrow Bowen Gas Project SREIS Section 3 Project Description EIS Section EIS Project Description Description of Change (in Supplement) 4.4 – Development Planning For the purpose of the EIS, production facility locations were Due to expected low gas pressures, as a result of the assumed to be located somewhere near the centre of each preliminary engineering undertaken in the concept select development area (17 in total) of 12 km radius. phase, the number of development (or drainage) areas has The indicative layout of production facilities across the increased to 33 in total, however; each of these drainage Project area were presented in Figure 4-4 of the EIS. areas now represent an approximate 6 km radius catchment area for gathering well production (gas and water), and distributing to surface production facilities located at or near the centre of drainage area. These 33 drainage areas will be developed over the Project life, however; Arrow does not expect all facilities to be operating together at one single time. See Figure 3–1. The number and location of development areas has been revised – this influences the indicative location of facilities. This change is now presented in Figure 3–1. See Section 3.2 of this report for details on the revised development planning and sequencing for the Project. 4.5 – Development Sequence 14 development regions were presented in the EIS. The overall Project development area has been sub-divided into 9 development regions (see Figure 3–1). See Section 3.2 of this report for details on the revised development planning and sequencing for the Project. 4.6 - Construction No outline of pipeline crossing construction techniques The SREIS case presents three options for pipeline crossings depending on the nature of each specific crossing: • Open cut; • Horizontal directional drilling; and • Bored. See Section 3.7.6 for detailed on the types of construction for pipeline crossings. Prepared for Arrow Energy Pty Ltd 3-9 42627140