Method for inhibiting water permeation in an extraction well of a hydrocarbon oil from an underground reservoir

A method for inhibiting water permeation in an extraction well of a hydrocarbon oil from an underground reservoir which comprises injecting into said reservoir at least one polymerizable composition comprising:

• at least a first monomer selected from the group consisting of an acrylic monomer and a methacrylic monomer;
• at least a second monomer comprising at least one ethylene unsaturation and at least one polyoxoethylene chain;
• at least one hydrophilic initiator of radical polymerization with thermal activation (hydrophilic initiator), wherein the at least one hydrophilic iniator is selected from the group consisting of 2,2′-Azobis[2-(2-imidazolin-2-yl)propane]dihydro-chloride (VA-044), 2,2′-Azobis[2-(2-imidazolin-2-yl)propane]disulfate dihydrate (VA-046B), 2,2′-Azobis(2-methylpropionamidine)dihydrochloride (V50), 2,2′-Azobis[N-(2-carboxyethyl)-2-methylpropionamid-ine]tetrahydrate (VA-057), 2,2′-Azobis(2 [1-(2-hydroxyethyl)-2-imidazolin-2-yl1[propane}-dihydrochloride (VA-060), 2,2′-Azobis[2-(2-imidazolin-2-yl)propane](VA-061), 2,2′-Azobis(1-imino-1-pyrrolidine-2-ethylpropane)-dihydrochloride (VA-067), 2,2′-Azobis{2-methyl-N-[1,1-bis(hydroxymethyl)-2-hydroxyethyl]propionamide}(VA080), 2,2′-Azobis[2-methyl-N-(2-hydroxyethyl)propion-amide](VA086), ammonium persulfate, sodium persulfate, potassium persulfate, hydroxymethanesulfonic acid monosodium salt dihydrate, 4,4′-Azobis(4-cyanovaleric acid) and granular 2,2′-Azobis(2-methylpropionamidine) dihydrochloride, and
• at least one lipophilic initiator of radical polymerization with thermal activation (lipophilic initiator), wherein the at least one lipophilic initiator is selected from the group consisting of benzoyl peroxide, 2,2′-Azobis(4-methoxy-2,4-dimethyl valeronitrile) (V-70) 2,2′-Azobis(2,4-dimethyl valeronitrile) (V-65), dimethyl-2,2′-azobis(2-methylpropionate)(V-601), 2,2′-azobis(2-methylbutyronitrile) (V-59), 1,1′-azobis(cyclohexane-1-carbonitrile) (V40), 2,2′-azobis[N-(2-propenyl)-2-methylpropionamide] (VF-096) 1-[(1-cyano-1-methylethyl)azo]formamide (V-30), 9) 2,2′-azobis(N-butyl-2-methylpropionamide) (VAm-110), 2,2′-azobis(N-cyclohexyl-2-methylpropionamide) (VAm-111), dicumyl peroxide, tert-butyl peroxide, tert-butyl peroxybenzoate and lauroyl peroxide,
• wherein the lipophilic initiator and hydrophilic initiator are present in the polymerizable composition in an overall concentration to allow the polymerization of the monomers once the polymerizable composition has reached the areas of the reservoir having a temperature at least equal to the activation temperature of both of the initiators, said polymerizable composition being unable to polymerize in the presence of oil.