Abstract: The invention relates to a method for modifying the water permeability of a subterranean formation, comprising at least the following steps: Preparing an injection fluid from a dispersion of a hydrophilic phase in a lipophilic phase, with water or brine, the dispersion comprising: a hydrophilic phase comprising at least one cross-linked (co)polymer PR, a lipophilic phase, at least one interface polymer composed of at least one monomer of formula (I): Injecting the injection fluid into the subterranean formation, said cross-linked (co)polymer PR forming a hydrogel in the presence of water.

Abstract: The invention relates to a method for modifying the water permeability of a subterranean formation, comprising at least the following steps: Preparing an injection fluid from a dispersion of a hydrophilic phase in a lipophilic phase, with water or brine, the dispersion comprising: a hydrophilic phase comprising at least one cross-linked (co)polymer PR, a lipophilic phase, at least one interface polymer composed of at least one monomer of formula (I): Injecting the injection fluid into the subterranean formation, said cross-linked (co)polymer PR forming a hydrogel in the presence of water.

Abstract: The invention concerns a method for preparing a dispersion of a hydrophilic phase in a lipophilic phase, comprising:—a hydrophilic phase comprising at least one water-soluble (co)polymer, —a lipophilic phase, —at least one interface polymer consisting of at least one monomer of formula (I): Formula (I) in which, —R1, R2, R3 are separately a hydrogen atom, a methyl group, a carboxylate group and Z—X, —Z is chosen from the group comprising C(?O)—O; C(?O)—NH; O—C(?O); NH—C(?O)—NH; NH—C(?O)—O; and a saturated or unsaturated, substituted or unsubstituted carbon chain comprising 1 to 20 carbon atoms capable of comprising one or more heteroatoms chosen from nitrogen and oxygen, —X is a group chosen from the alkanolamides, sorbitan esters, ethoxylated sorbitan esters, glyceryl esters, and polyglycosides; and comprising a saturated or unsaturated, linear, branched or cyclic, optionally aromatic, hydrocarbon chain.

Abstract: The present invention relates to a method for modifying the water permeability of a subterranean formation which comprises oil, said method comprising at least the following steps: Preparing an injection fluid from a dispersion of a hydrophilic phase in a lipophilic phase, with water or brine, the dispersion comprising: a hydrophilic phase comprising at least one linear (co)polymer E, a lipophilic phase, at least one interface polymer composed of at least one monomer of formula (I): Injecting the injection fluid into the subterranean formation, comprising a linear (co)polymer E concentration, such that when released and in contact with water, the viscosity of the injection fluid is greater than the viscosity of the oil in the formation.

Abstract: The invention relates to a method for modifying the water permeability of a subterranean formation, comprising at least the following steps: Preparing an injection fluid from a dispersion of a hydrophilic phase in a lipophilic phase, with water or brine, the dispersion comprising: a hydrophilic phase comprising at least one cross-linked (co)polymer PR, a lipophilic phase, at least one interface polymer composed of at least one monomer of formula (I): Injecting the injection fluid into the subterranean formation, said cross-linked (co)polymer PR forming a hydrogel in the presence of water.

Abstract: The invention concerns a method for preparing a dispersion of a hydrophilic phase in a lipophilic phase, comprising:—a hydrophilic phase comprising at least one water-soluble (co)polymer, —a lipophilic phase, —at least one interface polymer consisting of at least one monomer of formula (I): Formula (I) in which, —R1, R2, R3 are separately a hydrogen atom, a methyl group, a carboxylate group and Z—X, —Z is chosen from the group comprising C(?O)—O; C(?O)—NH; O—C(?O); NH—C(?O)—NH; NH—C(?O)—O; and a saturated or unsaturated, substituted or unsubstituted carbon chain comprising 1 to 20 carbon atoms capable of comprising one or more heteroatoms chosen from nitrogen and oxygen, —X is a group chosen from the alkanolamides, sorbitan esters, ethoxylated sorbitan esters, glyceryl esters, and polyglycosides; and comprising a saturated or unsaturated, linear, branched or cyclic, optionally aromatic, hydrocarbon chain.