Abstract: Disclosed is a method and a facility for treating Produced Water stream from a production well of an oil and gas field, the method and facility including: obtaining a first stream by directing the Produced Water stream to a system of separation by physical way; oxidizing the first stream by introducing in the stream an oxidant by contacting the Produced Water stream with an oxidant; and directing the oxidized stream to an aerobic bioreactor, to achieve a biological treatment.

Abstract: The present invention concerns a water injection system for EOR comprising in the direction of water flow: a water intake; a biocide tank for injecting a dose of biocide into the flow of water, a fine filtration unit able to retain particles of a size of 0.1 ?m or higher, a biofilm sensor in continuous contact with the water flow, a water injection line; as well as a method for removing a biofilm or controlling the formation of a biofilm on the surface of the pipes or the filtering elements of said water injection system wherein said method comprises the following steps: measuring the biofilm growth, response R of the biofilm sensor, comparing R with a reference value Ro, if R is higher than Ro, injecting a dose of biocide into the flow of water from the biocide tank.

Abstract: The invention relates to a method for extracting hydrocarbons. The steps involve extracting a process flow from an underground formation, separating this flow into at least one hydrocarbon-containing fraction and one aqueous fraction referred to as the produced water, and reinjcting an injection water into the underground formation. The injection water intended to be introduced into the underground formation is produced partly in a direct-osmosis unit from produced water and partly in a nanofiltration and/or reverse-osmosis unit. The invention also relates to a process for extracting hydrocarbons throughout the exploitation life of the underground hydrocarbon reservoir, and to an injection-water production device especially designed for implementing this process.

Abstract: The invention relates to a process for removing pollution from production water, comprising the steps of introducing the production water and ozone into a reactor containing zeolites, subjecting the production water in the reactor to irradiation by UV light, and separating the production water from the zeolites, so as to obtain production water from which pollution has been removed. The invention also relates to a device for removing pollution from production water.