METHOD TO INCREASE OIL RECOVERY IN BEDS WITH CARBONATE ROCKS Russian patent published in 2010 - IPC E21B43/22 

FIELD: oil-and-gas industry.

SUBSTANCE: proposed method comprises injecting water solution of surfactant - neonol "АФ9-12" with concentration not exceeding 0.1%, intermittently in 4 to 8 lunar cycles of tides after stop during first 3 to 5 days of the tide beginning in amount defines by the formula: V=πmhR², where V is injection volume, m³; m is coefficient of porosity, unit fractions; h is bed thickness necessary for processing, m; R is production well drain standard radius. It further comprises holding during entire period of tide of said cycle, starting said production well. Note here that priority treatment is performed at well product water cut of 95-99%.

EFFECT: increased oil recovery of beds with carbonate rocks.

2 cl, 1 tbl, 2 dwg