METHOD OF WATER AND GAS IMPACT ON FORMATION AND PUMPING-EJECTOR SYSTEM FOR ITS IMPLEMENTATION Russian patent published in 2020 - IPC E21B43/20 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil industry and can be used for implementation of water and gas impact at increasing oil recovery of formations. Method of water-gas impact on formation includes formation of ejector of fine water-gas mixture with foam-forming surfactants and subsequent pumping of obtained mixture by booster pump to injection wells. At the output of the booster pump, the flow of the formed mixture is divided into two parts, one of which is directed directly into the injection wells, and the second one is discharged into the additional contour of ejection of water-gas mixture to increase its gas content with subsequent return of the formed mixture to the input of the booster pump, wherein the supply of the booster pump by liquid is set more than the supply of the power pump. Formation system comprises a power pump, a first ejector whose output is connected to the booster pump input, a vessel with foam-forming surfactants, lines of water supply to power pump, water injection, gas pumping, SAW supply and water-gas mixture pumping to pressure wells with controlled valves installed on them, receiving chamber of the first ejector is communicated with the gas pumping line and with the foam-forming surfactant feed line, and the water injection line is communicated with the first ejector nozzle. In the system the second ejector is installed, and at the output of the booster pump there installed is the water-gas mixture flow divider with discharge lines, one of which is interconnected with the water-gas mixture pumping line to the injection wells, and the other one is connected to the second ejector nozzle, the receiving chamber of which is interconnected with the gas pumping line, and the outlet is connected to the booster pump input.

EFFECT: providing control of gas content of water-gas mixture in reservoir conditions to values ensuring maximum possible increase of oil displacement coefficient by optimization of gas fraction in water-gas mixture pumped to injection wells.

12 cl, 2 dwg