METHOD FOR NON-UNIFORM OIL POOL DEVELOPMENT CONTROL Russian patent published in 2006 - IPC E21B43/22 

FIELD: oil production industry, particularly for oil pool development at later stage.

SUBSTANCE: method involves injecting aqueous solution including polyacrylamide and cross-linking agent simultaneously with aqueous solution including surfactant and calcium chloride; injecting aqueous solution including surfactant and calcium chloride and injecting displacing agent, namely water. Polyacrylamide and cross-linking agent -containing aqueous solution comprises 0.1-0.5% of polyacrylamide, 0.01-0.05% of cross-linking agent, namely chrome acetate, remainder is water. Surfactant and calcium chloride-containing aqueous solution includes 1.0-5.0% of nonionic surfactant, 1.5-3.5% of calcium chloride, remainder is water.

EFFECT: increased conformance of pool intervals having non-uniform thicknesses are surface areas, increased injection well injectivity, restricted water withdrawal from oil pool area and, as a result, improved oil recovery.

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