METHOD OF DEVELOPMENT FOR WET OIL STRATA WITH INHOMOGENEOUS PERMEABILITY Russian patent published in 2013 - IPC E21B43/22 

FIELD: oil and gas industry.

SUBSTANCE: method of development for wet oil strata with inhomogeneous permeability can be used to increase reservoir recovery at simultaneous increase of stratum coverage by improvement of oil efficiency in heterogeneous collectors at later stages of oil development. Method of development for wet oil strata with inhomogeneous permeability includes successive pumping through injection wells of water-based system for water-soluble polymer and clay and surfactant solution; for the above solution a mix of non-ionic surfactants and anionic sulfurised surfactant is used in hydrocarbon solvent with the following ratio of components, by wt %: mix of non-ionic surfactants and anionic sulfurised surfactant 2 - 35, hydrocarbon solvent - remaining quantity; at that concentration of polymer and clay is selected on the basis of wells injectability and when pumping of the above system is completed it is forced through into stratum by water and then hold within 12-24 hours.

EFFECT: increasing treatment efficiency.

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