METHOD TO DEVELOP WATER-FLOODED OIL POOL Russian patent published in 2010 - IPC E21B43/20 E21B43/22 

FIELD: oil-and-gas industry.

SUBSTANCE: invention relates to oil industry and can be used in developing water-flooded oil pool. Substance claim: in development of water-flooded oil pool, working agent is forced via fill-in wells, as well as water solution of metal multivalent salt, buffer slug and water solution of caprolactam production flows. In compliance with this invention, oil is extracted through output wells. Output well is stopped. Hydrocarbon fluid is forced into output well along tubular annulus and into top oil-saturated pay in amount of 0.3 to 1.3 m³/m of pay strata at forcing pressure varying from hole bottom pressure to fracturing pressure. At a time, working agent is forced via fill-in wells, as well as water solution of metal multivalent salt, buffer slug and water solution of caprolactam production flows into output well along tubular annulus and into top oil-saturated pay in amount of 0.3 to 1.3 m³/m of pay strata at pressure lower than forcing pressure by hydrostatic pressure difference in fluid columns at fluid flow rate 9 to 11 times higher than that in tubular annulus.

EFFECT: higher oil recovery of oil reservoir.

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