Patent ID: 9470080
Filing Date: 2016-10-18
CPC Classification: E21B

Claim Text:
1. A method for recovering oil from an oil-bearing formation, comprising: (i) providing a reverse osmosis (RO) unit comprising at least one membrane having a first side and a second permeate side opposite the first side; (ii) feeding a first feed stream having a first salinity content to the first side of the membrane; (iii) feeding a second feed stream having a second salinity content to the second permeate side of the membrane wherein the first feed stream that passes through the membrane is mixed with the second feed stream on the second permeate side of the membrane to form a product stream; (iv) discharging a retentate stream from the first side of the membrane; (v) discharging the product stream having a controlled salinity content from the second permeate side of the membrane; (vi) injecting at least a portion of the product stream into the oil-bearing formation; and recovering at least a portion of the oil from the oil-bearing formation.