Dorado Development - FPSO and WHP - Produced Water Treatment

⁠⁠⁠The Dorado Project is a greenfield oil development located offshore WA approximately 150km northwest of Port Hedland comprising of a Floating Production Storage and Offloading vessel (FPSO), Wellhead platform (WHP) and various subsea (SURF) equipment.

The main purpose of the Produced Water Treatment Package (PWTP) is to reduce the hydrocarbon content to a suitable specification, at least < 30 ppmv total oil in water (dissolved + dispersed) for disposal overboard at the expected produced water flow rates for the entire life of field.

The PWTP consists of a two stage hydrocyclone process (HP and MP) consisting of two epoxy/ glass flake lined carbon steel pressure vessels in series to remove free oil droplets from the bulk water phase and a Compact Flotation Unit (CFU) or an Induced Gas Flotation Unit (IGF), consisting of a single epoxy/ glass flake lined carbon steel pressure vessel, which performs a final polishing step to remove the remaining oil to meet the specified oil in water specification. All three vessels shall have specialist custom-designed internals.

Incorporated within this package are associated pipework, control valves, manual valves and instrumentation together with interfaces with incoming fuel gas and produced water and outgoing reject and treated water for overboard disposal.

The package supplier should recognize that there is likely to be relatively high concentration of dissolved oil in the water to be treated which may require the PWTP supplier to include treatment technology in addition to the equipment referenced above.

The PWTP supplier will have the full responsibility to meet the required produced water quality for routing overboard.

Equipment Particulars:

• Produced Water Flow Rate at Inlet, kg/hr 134.77
• Pressure at Hydrocyclone Inlet, barg 30
• Pressure at CFU Outlet, barg 0.3
• Operating Temperature, Deg C 77.6
• Oil content at Outlet, ppmv < 20

Supply of the package shall include design, manufacture, inspection, testing, painting, preservation, packing and delivery incl. provision of documentation for the PWTP package.

Packages shall be marinized suitably for offshore environmental conditions at the Dorado field