METHOD OF OIL RESERVOIR DEVELOPMENT Russian patent published in 2010 - IPC E21B43/20 

FIELD: oil-and-gas industry.

SUBSTANCE: water-gas mix (WGM) is prepared by fluid-gas disperser (FGD) arranged at injection well mouth whereto compressed water and gas are fed. Gas is bled from gas wells or from tapped gas-saturated interval isolated from injection interval and communicated via circular space behind lift tube string and shut-off valves and accessories with FGD. Note here that WGM is injected by alternating in each cycle either injection of gas only or injection of water and gas, or gas and water, on maintaining injection well bottom hole pressure in injection interval with the following conditions observed: P_g<P_m<P_w, where: P_m is bottom hole pressure in injecting WGM into bed, P_g and P_w is bottom hole pressure in injecting only has or water, respectively. Note here that P_g, P_m and P_w are varied in every cycle from preset minimum to preset maximum values. In simultaneous feed of water and gas to FGD, water flow rate is kept constant, while water flow rate is varied within preset limits, or gas flow rate is kept constant while water flow rate is varied within preset limits.

EFFECT: higher efficiency of oil reservoir development.

2 cl, 1 dwg