FIELD: oil and gas production.
SUBSTANCE: composition for insulation of water production in gas and oil wells contains urethane pre-polymer, solvent and water. As solvent there is used hydrophilic a-proton solvent with dielectric permeability in the range 6-45 of a general formula: R1-A(O)-R2, where: R1 is methyl or ethyl group, R2=R1 or -O-R1, A is tetravalent atom of carbon or sulhur at the following ratio of components, wt parts: urethane pre-polymer 100, water 0.03-33, the said solvent 200-2000. As the said solvent there can be used acetone or ethyl-acetate or di-methyl-sulphoxide.
EFFECT: raised efficiency of selective water insulation of water-saturated zones of reservoir in gas and oil wells.
2 cl, 4 ex, 1 tbl
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