OIL RECOVERY METHOD Russian patent published in 2008 - IPC E21B43/20 

FIELD: oil and gas.

SUBSTANCE: invention is referred to oil producing industry and can be used on reservoirs with considerable oil-filled thickness. According to the method the water gas mixture injection through fill-in wells and production bleeding through exploitation wells are conducted. As fill-in and exploitation wells the holes with horizontal holes in a pay are used. Horizontal holes are drilled in a bottom part of a productive part of a formation in one plain the one over another along a major axis of a field. Horizontal holes of fill-in wells are positioned over horizontal holes of exploitation wells. A water gas mixture injection is made cyclically; a cyclic injection is executed by pressure alteration of inflating on fill-in wells. As water gas mixture the water gas mixture is injected at an optimum ratio of volume of water and gas injection, determined from a proportionality condition of volumes rate of small pores less than the medium size and of large pores more than the medium size in a header. Thus at first an injection of a water gas mixture bank with enriched gas is conducted, and then an injection of water gas mixture with lean gas is conducted. Water gas mixture injection is alternated with water injection.

EFFECT: increase of formation sweep by affecting and due to it accretion of an oil field recovery.

1 ex, 4 tbl, 2 cl