Chevron U.s.a. Inc.

Nov Subsea Products as

Eirik Bjerve Sund

Russell Evan Cooper

Christopher John Kalli

Jan-Otto Reimers

Gudmund Roger Totland

Method and system for separation of produced water into a water fraction, a solids fraction and a hydrocarbon fraction, comprising feeding produced water into a collapsible flexible bag maintained subsea by a protection structure; operating the flexible bag at an overpressure and thereby providing a predefined geometry of the flexible bag; maintaining the produced water in the flexible bag to allow for gravitational separation of the solids fraction with a higher density than water in a lower section and optionally separation of the hydrocarbon fraction with a lower density than water in an upper section; removing the water fraction from a section above the lower section; optionally removing hydrocarbons from the upper section and replacing the flexible bag to remove the solids fraction.

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Bærums Verk, Norway

Eirik Bjerve Sund