METHOD FOR BALANCING INJECTION WELL WATER-INTAKE CAPACITY PROFILE AND RESTRICTION OF WATER INFLUX TO PRODUCTION WELLS Russian patent published in 2016 - IPC E21B43/22 

FIELD: oil industry.

SUBSTANCE: invention relates to oil industry, in particular, to methods of limiting water influx in production wells and balancing injection well water-intake capacity profile. Using the presented method in oil industry will allow to eliminate limitations on the use of polymer gel-forming compositions at deposits with mineralized water, increase their efficiency. In method for balancing of injection well water-intake capacity profile and restriction of water influx to production wells, which involves pumping to the formation of an aqueous solution of polyacrylamide and a cross-linking agent, where the said solution is prepared on the formation water with subsequent introduction of sodium hydroxide up to pH 8.0, sodium bicarbonate in the amount of 2.48 wt%, additionally introduced chelating agent - disodium dihydrogen ethylenediaminetetraacetate in the amount of 0.1-5.0 wt%, then polyacrylamide in the amount of 0.2-3.5 wt%, chrome acetate in the amount of 0.47 wt%.

EFFECT: technical result is the increase of technological effectiveness of using polymer compositions, and the formed gel in less susceptible to degradation.

1 cl, 2 tbl