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

FIELD: oil production industry, particularly to develop oil fields with flooding thereof by selective isolation of flushed highly-permeable productive reservoir zones.

SUBSTANCE: method involves performing flooding operation; isolating flushed highly-permeable reservoir zones by injecting mixture in reservoir, wherein the mixture includes sodium silicate solution and surfactant solution; performing time-delay; executing flooding operation and displacing oil. First of all 9% calcium chloride solution is injected in amount of 10% of pore volume. Then the first buffer agent, namely 1% calcium hydroxide or sodium hydroxide, is supplied in amount equal to flow string volume. After that 40-50% sodium silicate solution is fed in volume equal to 20% of pore volume. Then the second buffer agent, namely 0.1% surfactant solution, is supplied in amount equal to three flow string volumes. Finally gaseous carbon dioxide is injected in amount of 10% of above sodium silicate solution. Above sodium silicate solution may additionally include acetic acid in volume of 0.25% of sodium silicate solution volume.

EFFECT: increased admissible pressure gradient in gel mass obtained in productive reservoir and possibility to control gel mass properties.

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