OIL FIELD RECOVERY INCREASE METHOD Russian patent published in 2006 - IPC E21B43/22 E21B43/24 

FIELD: oil production industry, particularly to increase oil field recovery with the use of heat and gas treatment methods.

SUBSTANCE: method involves applying heat-and-gas action on formation by serially injecting oxygen-containing gas and water in formation of oil field having formation temperature of 90-200°C; injecting alkali bicarbonate solution of 20-80 g/l concentration into formation; injecting water. The alkali bicarbonate is sodium bicarbonate or potassium bicarbonate or mixture thereof.

EFFECT: increased oil recovery, increased efficiency of heat and gas action to oil fields at later or final development stage.

2 cl, 6 ex, 6 tbl