METHOD FOR WATERED NON-UNIFORM OIL RESERVOIR PERMEABILITY TREATMENT Russian patent published in 2007 - IPC E21B43/22 

FIELD: oil production, particularly to stimulate oil production and decreased water content in produced oil.

SUBSTANCE: method involves injecting aqueous polymer solution and clay mix in reservoir. First of all mixture including 0.3% aqueous polyacrylamide solution in complex chydocarbon solvent taken with ratio 1:3 is injected. Then fresh water plug and mixture including 2% caustic soda or liquid glass solution with clay mixed with fresh water are injected, wherein clay-water ratio is from 1:1 to 1:5. The later are forced in reservoir with fresh water plug having volume equal to 2 flow string volumes. Well is stopped for at least 8 hours to perform reaction in the well. Then displacing agent is injected in well.

EFFECT: increased efficiency of non-uniform oil reservoir permeability regulation and increased fullness of oil production from zones non-covered with treatment due to action application to watered reservoir intervals.

1 tbl