METHOD FOR INHIBITING THE PERMEATION OF WATER IN AN EXTRACTION WELL OF A HYDROCARBON FLUID FROM AN UNDERGROUND RESERVOIR

摘要

The present invention relates to a method for inhibiting the permeation of water in an extraction well of a hydrocarbon fluid from an underground reservoir which comprises: a) injecting into said reservoir at least one treatment fluid comprising at least one dispersion, in particular one emulsion in an organic solvent of at least one copolymer from a first monomer selected from acrylic acid or methacrylic acid, and a second monomer comprising at least one ethylene unsaturation and at least one polyoxyethylene chain and having the following formula (I): CH₂=CR₁-CO-X-(CH₂CH₂O)_n-R₂ (I), wherein R₁ is H or CH₃; R₂ is H or C₁-C₄-alkyl; X is O: n is an integer ranging from 4 to 200, and wherein the organic solvent is substantially insoluble in water and soluble or partially soluble in oil, and wherein the organic solvent has a water solubility at 25°C lower or equal to 5 g/L and a solubility in oil at 25°C equal to or higher than 100 g/L. The present invention also relates to dispersions, and in particular emulsions of copolymers usable in the above-mentioned method.