METHOD FOR OIL FIELD DEVELOPMENT Russian patent published in 2007 - IPC E21B43/22 

FIELD: oil production, particularly to develop non-uniform oil reservoir to limit water inflow in production wells and to increase oil recovery.

SUBSTANCE: method involves injecting mixture including polyacrylamide and aqueous biological surfactant solution in reservoir through injection well; forcing the mix in reservoir with fresh water and performing time delay for 24 hours. Mixture additionally has sodium hydroxide. Surfactant: polyacrylamide: sodium hydroxide ratio is 2.5:1:5.

EFFECT: increased efficiency in the case on reservoirs with non-uniform permeability at later stage of oil field development.

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