METHOD FOR NON-UNIFORM OIL RESERVOIR DEVELOPMENT Russian patent published in 2007 - IPC E21B43/22 E21B43/32 

FIELD: oil production, particularly by reservoir waterflooding.

SUBSTANCE: method involves cyclically injecting polymeric dispersed system components in reservoir, wherein the polymeric dispersed system includes polyacrylamide, mud powder, chromium composition and water. The mud powder is modified bentonite mud powder. The polymeric dispersed system is injected in the following way. First of all 4-6% modified bentonite mud powder suspension in 0.04-0.12% aqueous polyacrylamide solution is injected in well. Then the suspension is forced in reservoir with buffer water volume and holding in reservoir within 1-3 hours. After that 1-6% modified bentonite mud powder suspension in water including 0.005-0.015% of chromium composition is injected in well under pressure 10-40% higher than water injection pressure in series with mixture including 0.07-0.25% aqueous polyacrylamide solution and 0.033-0.1% chromium composition solution under water injection pressure.

EFFECT: increased oil recovery from reservoirs, decreased water content in produced product and prevention of reservoir bottom area mudding.

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