METHOD FOR INCREASED OIL RECOVERY IN BEDS WITH CARBONATE ROCKS Russian patent published in 2009 - IPC E21B43/22 

FIELD: oil and gas production.

SUBSTANCE: invention is related to oil production industry, in particular to methods for increase of bed oil recovery and to improve intensification of oil production. Method includes pumping water solution of surface-active materials with concentration of at least 0.05% into well bed with a delay for reaction and further commissioning of well. According to invention, water solution of surfactants used is a water solution of neonol AF₉-12 with concentration that does not exceed 0.1%, which is pumped in period of moon tide monthly cycle start in volume defined in compliance with analytical formula. Surfactants are maintained within the whole period of monthly moon cycle tide period.

EFFECT: creation of cheap and manufacturable method to improve oil recovery in bed with carbonate rocks due to more efficient use of surface-active material with account of moon tides and ebbs.

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