FIELD: oil and gas industry, particularly to isolate reservoirs in water inflow zones with the use of plugging compositions based on artificial resin curable under reservoir conditions.
SUBSTANCE: method involves injecting plugging composition curable under reservoir conditions in production or injection well; forcing thereof to isolation interval and holding the plugging composition in isolation interval to provide curing and strength development thereof. The plugging composition includes artificial resin, hardener and water. The artificial resin is urea-formaldehyde resin. The hardener is drilling reagent Okzil-SM and aluminum salt crystalline hydrate: chloride AlCl3·6H2O or sulfate Al2(SO4)3·18H2O or alum - Al(K)(SO4)2·12H2O. All above components are taken in the following amounts (% by weight): urea-formaldehyde resin - 60, Okzil-SM - 1.0-3.0, aluminum salt - 0.1-5.0, remainder is water.
EFFECT: increased reliability and efficiency of reservoir isolation.
2 tbl
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