CPC C09K 8/44 (2013.01) | 11 Claims |
1. 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 non-cross-linked (co)polymer NR,
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 and a cross-linking agent for the (co)polymer NR into a subterranean formation,
said (co)polymer NR, once cross-linked, forming a hydrogel in the presence of water.
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