OIL FIELD DEVELOPMENT METHOD (VARIANTS) Russian patent published in 2008 - IPC E21B43/20 

FIELD: oil production, particularly oil field development methods.

SUBSTANCE: method involves injecting water into well provided with production string via tubing; installing isolation devices, namely packers, in well; lowering liquid-gas ejector connected to tubing in well, wherein the ejector includes low-pressure chamber for water-gas mixture injection having outlet communicated with water-saturated volume. In the case of gas pool or gas cap presence in oil field and gas pool/gas cap location under water-gas mixture injection interval one isolation device is installed over water-gas mixture injection interval. The second device is arranged between water-gas mixture injection interval and gas pool or gas cap. Low-pressure chamber of gas-liquid ejector lowered in well is communicated with liner through cavity defined by outer tubing wall and inner wall of production string, namely pipe. Lower pipe end is communicated with gas pool through perforated orifices. Upper end of production string, namely pipe, is communicated with hole annuity.

EFFECT: increased oil recovery from oil deposit, decreased capital and operational costs.

2 cl, 2 dwg