METHOD FOR OIL RESERVOIR DEVELOPMENT BY WATER-GAS IMPACT Russian patent published in 2021 - IPC E21B43/20 

FIELD: oil industry.

SUBSTANCE: invention relates to the oil industry, namely: to the development of oil fields with waterflooding with a water-gas solution. A method for the development of an oil reservoir by water-gas impact, including flooding the reservoir with a water-gas solution by injecting a water-gas solution and 0.01-1.0% of a surfactant through injection wells, which is added to water before mixing with gas into a water distribution comb, wherein a gas solution is injected as a water-gas solution at a ratio of volumes of gas to water, ensuring complete saturation of water with gas under reservoir conditions. Preliminarily, laboratory studies of the salinity of water and core obtained from the treated deposit are carried out, the composition of the foaming surfactant and the exact concentration of the surfactant and gas in the water are determined to obtain optimal characteristics for maximum efficiency of the impact of the water-gas solution on the deposit. The surfactant is fed into the water with an adjustable dispenser in proportion to the volume of water supplied to the water distribution comb. Injection into an oil reservoir is carried out after mixing water with a surfactant with gas in a laminar mode after obtaining a water-gas solution uniform in volume.

EFFECT: method allows to ensure the maximum water-gas impact on the productive stratum of the deposit.

2 cl, 1 dwg