Australia

Landmark: Woodside’s First Horizontal Trees

Project Overview

• Contract Award: 2000
• Sales: Singapore
• Fabrication: Singapore
• Service Base: Perth, Australia
• Host Type: Platform
• Contract Type: EPC

Project Characteristics

• No. Trees: 2
• Water Depth: 130 m (430 ft)
• Tree Type: Horizontal
• Tree Pressure: 5,000 psi
• Tree Bore Size: 5"x2"
• Hydrocarbon: Gas

Project Ownership

• Woodside 16.7%
• BP 16.7%
• ChevronTexaco 16.7%
• BHP Billiton 16.7%
• Shell 16.7%
• Japan LNG 16.7%

Scope of Work

• Two (2) horizontal 5"x2" 5,000 psi subsea trees
• Two (2) production flowbases
• ISO interfaces for third-party subsea control module and choke
• Vibration analysis (due to high flow rate)
• System integration testing, installation assistance, service and maintenance

Comments

The Echo Yodel development is a liquids-rich, gascondensate field located in 130 m (430 ft) water depth, 23 km (15 miles) southwest from the Goodwyn A platform (GWA) on the North West Shelf of Western Australia. The development consists of two (2) subsea wells and is based upon variant big-bore well design with expandable sand screen completions to maximize well potential.

The wells were drilled and completed from a semisubmersible rig. They are approximately 2 km (1.2 miles) apart along the pipeline route and are tied back by rigid spool pieces. This represents the first phase of development of the greater Echo Yodel area. The proposal also allows for the phased development of additional fields and reservoirs in the area.

Production flows via a 12" nominal-diameter corrosionresistant alloy (CRA) pipeline to GWA at up to 300 mmcf/d maximum raw gas rate. Production is commingled with GWA fluids and processed on GWA before exporting into GWA to North Rankin "A" interfiled pipeline.