Australia

Landmark: First 7" Large Bore Vertical Gas Tree

Project Overview

• Contract Award: 2004
• Sales: Perth, Australia
• Fabrication: Dunfermline, U.K. & Kongsberg, Norway 
• Service Base: Singapore
• Host Type: NA
• Contract Type: EPC

Project Characteristics

• No. Trees: 4
• Water Depth: 134 m (440 ft)
• Tree Type: EVXT
• Tree Pressure: 5,000 psi
• Tree Bore Size: 7"
• Hydrocarbon: Gas

Project Ownership

• Woodside 100%

Scope of Work

• Four (4) Wellheads UWD 15
• Four (4) 7” 'Big Bore' Gas VXT with independantly installed Flow Control (Choke) Module
• Four (4) Flowbases with 8" Ball Valve
• Workover Controls
• Topside controls
• Workover Riser (NACE) Union Nut
• Intervention Tooling
• System integration ,testing, installation assistance, service and maintenance

Comments

As part of the expansion of the North West Shelf, Woodside Energy Ltd plans to further develop the Perseus gas/condensate field, approximately 15 km East N.E. of the Goodwyn 'A' platform via a subsea tie-back. In addition it is planned to develop the Searipple field with a single well some 3 km NE of the pipeline end. This fully integrated development is named the ‘Perseus over Goodwyn Project, (PoG)’

The Perseus reservoir is expected to produce 10.2 Tcf gas and 239 MMbbl condensate through depletion via the North Rankin 'A' and GWA facilities. The initial production rate from the 3 PoG wells will be circa 500 MMscfd.

The single well Searipple development has expected recoverable reserves estimated at 0.03 Tcf of gas and 4.7MMbbls of condensate over a field life of 2-5 years with aquifer supported depletion drive. The Searipple opportunity is driven primarily by liquids acceleration.

Full wellstream production will be transported to GWA via a new 22km, 16” corrosion resistant alloy clad pipeline.  Subsea system control, receiving facilities and gas treatment will be facilitated via the GWA platform before export to the onshore gas plant via the interfield line and Second Trunkline.

The Subsea hardware supplied by FMC consists of 4 off 7" Big Bore Gas Trees of the Vertical design with independantly retrievable Flow Control Modules and Flowbases tied directly to a 16" pipeline. Control of subsea facilities and injection of chemicals will be via an umbilical from the GWA platform.