Method for modifying the water permeability of a subterranean formation

A method for modifying 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):
• in which,
• R1, R2, R3 are independently selected from the group consisting of a hydrogen atom, a methyl group and Z—X,
• Z is selected from the group consisting of 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 having from 1 to 20 carbon atoms which may have one or more heteroatoms selected from nitrogen and oxygen,
• X is a group chosen from alkanolamides, sorbitan esters, ethoxylated sorbitan esters, glyceryl esters, and polyglycosides;
• and comprising a saturated or unsaturated, linear, branched or cyclic, optionally aromatic, hydrocarbon chain,
• injecting the injection fluid into the subterranean formation, said cross-linked (co)polymer PR forming a hydrogel in the presence of water.