US 11,987,744 B2
Method for modifying the water permeability of a subterranean formation
Cédrick Favero, Andrezieux Boutheon (FR); Olivier Braun, Andrezieux Boutheon (FR); and Lionel Lauber, Andrezieux Boutheon (FR)
Assigned to SNF GROUP, Andrezieux Boutheon (FR)
Filed by SNF Group, Andrezieux Boutheon (FR)
Filed on Aug. 18, 2023, as Appl. No. 18/452,258.
Application 18/452,258 is a division of application No. 17/422,840, granted, now 11,767,460, previously published as PCT/FR2020/050134, filed on Jan. 29, 2020.
Claims priority of application No. 1901021 (FR), filed on Feb. 1, 2019.
Prior Publication US 2023/0392066 A1, Dec. 7, 2023
Int. Cl. C09K 8/44 (2006.01); E21B 43/16 (2006.01)
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):

OG Complex Work Unit Chemistry
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.