FIELD: oil and gas industry.
SUBSTANCE: system for oil production and separation comprises: oil-bearing formation; aqueous fluid with low degree of mineralization having ionic strength of less than 0.15 mol/l and having total dissolved solids content from 200 ppm to 10,000 ppm; salt solution having total dissolved solids content greater than 10,000 ppm; demulsifier which is effective for separating crude oil and water; means for introducing aqueous fluid with low degree of mineralization into the oil-bearing formation; means for production of oil and water from the oil-bearing formation after introduction of water fluid with low degree of mineralization inside the formation; means for contacting salt solution and demulsifier with oil and water produced from the oil-bearing formation and for separation of produced oil from produced water.
EFFECT: swift achievement of final phase separation.
37 cl, 12 dwg, 1 ex
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