FIELD: chemistry.
SUBSTANCE: invention relates to chemistry of oil and concerns use of non-organic reagents for oil industry, in particular, for acid and salt treatment of oil-containing formation, represented by heterogeneous permeability carbonate or terrigenous reservoirs. Described is a method of increasing oil recovery by chemical treatment, including pumping into reservoirs salt solutions of sodium and magnesium, wherein said solution is acidified solution of sodium chloride and magnesium chloride in ratio 1:0.10÷0.15 with total content of salts 60-200 g/l, and alternation of pH of pumped solution selected from range 1.0-5.5.
EFFECT: technical result is higher oil recovery of formations.
1 cl, 2 tbl, 4 ex
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