REAGENT FOR TREATING OIL RESERVOIR AND METHOD OF USING SAID REAGENT Russian patent published in 2012 - IPC C09K8/584 E21B43/22 

FIELD: chemistry.

SUBSTANCE: invention relates to oil industry, particularly reagents for treating an oil reservoir and methods of extracting oil and can be used on oil deposits in a wide range of reservoir temperature (20-90°C), total content of salts in the stratal and injected water (0.034-24.0 wt %) with carbonate, terrigenous and mudded rocks. The reagent is a mother solution of ammonium sulphate from stripping aqueous acidic wastes from caprolactam production containing not less than 41 wt % dry residue, not less than 2.1 wt % amino organic acids in form of amino caproic acid and having pH higher than 4.4. The method of extracting oil involves pumping said reagent and aqueous solution of electrolyte and/or organic solvent.

EFFECT: high well productivity and high reservoir recovery.

2 cl, 4 tbl