WATER INFLUX ELIMINATION AGENT FOR USE IN OIL FIELDS Russian patent published in 2019 - IPC E21B43/22 C09K8/84 C09K8/92 B82Y99/00 

FIELD: drilling of soil or rocks; mining.

SUBSTANCE: invention relates to compositions and methods of treating underground wells, aimed at controlling movement of water in permeable wells surrounding a borehole, and from them. Method of treating an underground well having one or more permeable beds, comprising obtaining a treatment fluid comprising water and a plurality of water-dispersible nanoparticles present in the treatment fluid in a concentration of about 0.1–5.0 wt. %, introduction of said medium into underground formation, so that nanoparticles form one or more aggregates, plugging pores of formation and blocking further flow of fluid medium in formation. Method of controlling water influx from an underground well having a wellbore and one or more permeable beds, comprising obtaining a treatment fluid comprising water and a plurality of water-dispersible nanoparticles present in said medium in a concentration of about 0.1–5.0 wt. %, introduction of said medium into one or more permeable formations so that nanoparticles form one or more aggregates plugging formation pores and blocking water flow from one or more permeable formations to the well shaft. Method for increasing oil recovery, comprising obtaining a treatment fluid containing water and a plurality of water-dispersible nanoparticles present in said medium in a concentration of about 0.1–5.0 wt. %, introducing said medium into an injection well having a borehole and one or more formations with different permeability, such that nanoparticles form one or more aggregates clogging pores in more permeable areas of one or more permeable formations, slowing the flow of fluid from the wellbore to more permeable areas of one or more permeable formations, pumping of the flooding fluid medium into the injection well so that the flooding fluid flows towards one or more production wells, displacing oil or gas or oil and gas in one or more permeable formations, and production of oil or gas or oil and gas from one or more production wells. Invention is developed in dependent items of the formula.

EFFECT: technical result is the increase in the treatment efficiency.

18 cl, 3 ex