METHOD FOR DEVELOPMENT OF WATER-FLOODED OIL RESERVOIR WITH UNHOMOGENEOUS GEOLOGIC STRUCTURE Russian patent published in 2017 - IPC E21B43/22 E21B43/32 

FIELD: oil and gas industry.

SUBSTANCE: method for development of a water-flooded oil reservoir with unhomogeneous geologic structure includes injecting a water-based residue gellant containing an alkali silicate and a divalent metal chloride into the reservoir. First, sodium powdered glass is injected as an alkali silicate in the form of a suspension into the reservoir via an injection well, while using fresh or mineralized water with a mineralization of not more than 50 g/l. Said suspension is forced into the reservoir by a water buffer volume of 3-15 m³. Then magnesium chloride and/or calcium chloride is injected as a divalent metal chloride into the injection well. After that, the reagents are forced in with a water buffer volume of 15-30 m³. Then, the well is kept for reaction for 8-24 hours. Further, the well is put into operation, wherein the commodity forms of calcium chloride or mineralized water with a mineralization of not more than 50 g/l are used.

EFFECT: increased development efficiency.

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