OIL PRODUCTION INTENSIFICATION METHOD Russian patent published in 2010 - IPC E21B43/22 

FIELD: oil-and-gas industry.

SUBSTANCE: invention related oil-and-gas industry, particularly to reservoirs oil recovery rate increase due to injection and production wells treatment with chemical reagents, which able to change rock filtration properties, increasing oil phase permeability and decreasing water phase permeability. Method of oil recovery rate intensification includes injection in to the well of acid inverted emulsion or acid forming salt in a dispersion medium, generation of increased pressure with displacement fluid in the bottomhole zone with the following process ageing, the inverted emulsion has hydrocarbon dissolver or oil as a dispersion medium, before the imulsion pump into the well sodium nitrite solution with density 1183 kg/m³, ratio of mentioned above solution and the acid or the acid forming salt is from 1:2 till 1:3. The well contains hydrogen sulfide.

EFFECT: oil recovery increase at the same time accompanying water production decrease.

2 cl, 1 tbl, 5 ex