COMPOUND METHOD FOR OIL DISPLACEMENT OUT OF BED BY WATER-ALTERNATED-GAS INJECTION WITH USE OF WELL-HEAD EJECTORS Russian patent published in 2014 - IPC E21B43/16 

FIELD: oil and gas industry.

SUBSTANCE: invention pertains to oil and gas producing industry and namely to methods of oil recovery improvement and simulation of oil and gas production in injection producing oil and gas wells with terrigenous and carbonate reservoirs. The concept of the invention is as follows: method for oil displacement out of bed by water-alternated-gas injection with use of well-head ejectors is characterised by installation of well-head ejector with preset ratio of nozzle and diffuser at injection line of an injection well connected to annular space of production wells or a group of production wells at their pad; through this well-head ejector sediment-generating compound is pumped into the tube side of production tubing at first, then water is injected for associated gas injection and water-gas mixture is formed. At that pressure is decreased in annular space of the production well.

EFFECT: increasing efficiency of the method due to input profile balancing of injection wells with heterogeneous beds and channels with low filtration resistance and at the same improving operating mode of production wells.

5 cl, 2 ex, 1 dwg