Patent ID: 9085971
Filing Date: 2015-07-21
Classification: B01D,C02F,C09K,E21B,Y02A

Abstract:
1. A method for enhancing oil recovery (EOR) from an oil bearing formation, the method comprising: filtering at least some solids from a source water having a total dissolved solids content of from 10000 ppm to 50000 ppm in a filtration assembly to produce a first pre-treated water; treating the first pre-treated water with a nano-filtration (NF) assembly to produce a second pre-treated water wherein the second pre-treated water has reduced hardness and sulphate concentration relative to the source water; treating the second pre-treated water in a capacitive de-ionisation (CDI) assembly comprising at least one flowpath for the second pre-treated water arranged between a pair of oppositely charged electrodes which adsorb and thereby remove at least some ions from the second pre-treated water flowing through the flowpath, thereby producing treated water with a reduced salinity and solids content; and injecting the treated water with reduced salinity and solids content into the oil bearing formation to mobilize crude oil and enhance oil recovery.