Prelude FLNG Development Environmental Footprint and Conditions of Approval in a Post Montara and Macondo World
- Brian Cohen | Ma. Filipina Dumayas Caymo (Shell Philippines Explor. B.V.)
- Document ID
- Society of Petroleum Engineers
- International Conference on Health, Safety and Environment in Oil and Gas Exploration and Production, 11-13 September, Perth, Australia
- Publication Date
- Document Type
- Conference Paper
- 2012. SPE/APPEA International Conference on Health, Safety, and Environment in Oil and Gas Exploration and Production
- 6.5.2 Water use, produced water discharge and disposal, 4.1.6 Compressors, Engines and Turbines, 6.5.1 Air Emissions, 4.2 Pipelines, Flowlines and Risers, 4.2.4 Risers, 4.6.2 Liquified Natural Gas (LNG), 4.1.5 Processing Equipment, 4.5 Offshore Facilities and Subsea Systems, 3.2.6 Produced Water Management, 4.5.7 Controls and Umbilicals, 4.6 Natural Gas, 4.1.2 Separation and Treating, 6.5.5 Oil and Chemical Spills, 5.2.1 Phase Behavior and PVT Measurements, 6.5.3 Waste Management, 5.2 Reservoir Fluid Dynamics, 4.2.3 Materials and Corrosion
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In May 2011 Shell announced its commitment to the development of a Floating Liquefied Natural Gas (FLNG) concept by taking the Financial Investment Decision on the Prelude FLNG Project. Prelude is located in Australian offshore waters, approximately 475 km north-northeast of Broome and 825 km west of Darwin, and will be Shell's and possibly the world's first FLNG development. FLNG offers a number of environmental advantages over traditional onshore LNG developments. This paper describes some of these and the associated environmental permitting/approval conditions for the project.
Shell's FLNG concept provides a technically innovative solution for the development of the small and stranded gas assets in a cost-effective, environmentally and socially sound manner. Shell's Prelude FLNG will be the world's largest floating structure. It comprises a steel, double-hulled floating vessel-shaped facility, approximately 480 m in length by 75 m wide. When fully ballasted, it will weigh around 600,000 tonnes. The gas receiving, processing (treating, separation and liquefaction) and offloading equipment will all be mounted on the facility's topside. The storage and power generation is to be contained within the hull and the facility also supports other associated components such as the control room, maintenance areas and accommodation.
Upstream facilities will include 7 subsea production wells and manifolds, subsea flowlines, riser base manifolds, flexible risers to transport the gas, condensate and any produced formation water to the FLNG facility, and umbilicals to control the wells and associated facilities. The drill centre is located about 4 km from the FLNG facility.
Prelude is designed to produce 3.6 million tonnes per annum (mtpa) of LNG, 0.4 mtpa of LPG and 1.3 mtpa of condensate for export. Fabrication of the facility commences in 2012 and the Prelude is planned to be operational around the end-2016.
By developing the remote Prelude field (approx. 2 trillion cubic feet (TCF) of liquids-rich gas) through a floating LNG facility, Prelude avoids the need for a conventional onshore development scenario that would ordinarily comprise offshore platform(s), export pipeline(s), an onshore liquefaction plant, export jetty and, the associated facility preparation works including coastal dredging and land clearing.
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