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1. WO2020226853 - TRAITEMENT D'EAU DE MER POUR OBTENIR DE L'EAU À SALINITÉ ÉLEVÉE AVEC UNE FAIBLE DURETÉ POUR UNE RÉCUPÉRATION AMÉLIORÉE DE PÉTROLE

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

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CLAIMS:

We claim:

1. A method of treating water comprising,

treating a portion of feedwater by way of reverse osmosis to produce an RO permeate and an RO concentrate;

treating a portion of the RO concentrate by way of nanofiltration to produce NF permeate;

optionally treating a portion of the feedwater by way of nanofiltration to produce additional NF permeate;

using the NF or RO permeate or a blend of them as water to be injected in an oil bearing formation.

2. The method of claim 1 wherein the feed water has high, for example 35 g/L TDS or more, or the feed water comprises seawater.

3. The method of claim 1 or 2 wherein the product water has a salinity of 30 g/L TDS or more or 40 g/L TDS or more.

4. The method of any of claims 1 to 3 wherein the feed water comprises sea water and the product water has less than 20 mg/L hardness as CaCC>3.

5. A water treatment system comprising,

an RO system;

an NF systmem,

wherein an inlet to the RO system is connected to a source of feed water and a concentrate outlet of the RO system is connected to a feed inlet of the NF system.

6. The system of claim 5 wherein an inlet to the NF system is connected to the source of feedwater.

7. The system of claim 5 or 6 wherein a permeate outlet from the NF system is connected to an injection system and a permeate outlet form the RO system is connected to the injection system.

8. The system of any of claims 5 to 7 wherein the injection system is adapted to inject water comprising RO permeate and/or NF permeate, wherein the NF permeate may include treated RO concentrate at least at some times, into an oil-bearing reservoir.

9. The system of any of claims 5 to 8 having a suitable arrangement of pipes and valves or other flow control devices such that various ratios of flows in the system may be altered, optionally automatically or through a controller, optionally over time.

10. The system of any of claims 5 to 9 wherein a controller may manipulate flow control or other devices to vary one or more of (a) the relative amounts of feed water that flow to the inlet of the RO unit relative to the NF unit, (b) the amount if any of RO concentrate that flows to the NF unit, (c) and the relative amount of RO permeate and NF permeate in the product water.