US 11,718,783 B2
Method for preparing a composition comprising a hydrosoluble (co)polymer encapsulated in a shell and use of this composition in assisted oil and gas recovery
Olivier Braun, Andrezieux Boutheon (FR); and Lionel Lauber, Andrezieux Boutheon (FR)
Assigned to SNF GROUP, Andrezieux Boutheon (FR)
Appl. No. 16/768,355
Filed by SNF Group, Andrezieux Boutheon (FR)
PCT Filed Dec. 12, 2018, PCT No. PCT/EP2018/084575
§ 371(c)(1), (2) Date May 29, 2020,
PCT Pub. No. WO2019/115619, PCT Pub. Date Jun. 20, 2019.
Claims priority of application No. 1762196 (FR), filed on Dec. 14, 2017.
Prior Publication US 2020/0362229 A1, Nov. 19, 2020
Int. Cl. E21B 43/16 (2006.01); C09K 8/588 (2006.01); C09K 8/584 (2006.01); C08F 22/00 (2006.01); C08F 220/56 (2006.01)
CPC C09K 8/588 (2013.01) [C08F 220/56 (2013.01); C09K 8/584 (2013.01); E21B 43/16 (2013.01); C08F 2800/20 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for preparing a dispersion of a hydrophilic phase, comprising at least one water-soluble (co)polymer, in a lipophilic phase, comprising the following steps:
a) preparing a lipophilic phase comprising a lipophilic solvent and at least one monomer of formula (I):

OG Complex Work Unit Chemistry
wherein,
R1, R2, R3 are separately chosen from the group consisting of a hydrogen atom, a methyl group, a carboxylate group and Z—X,
Z is chosen 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 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,
b) preparing a hydrophilic phase comprising at least one monomer different from the monomer of formula (I),
c) introducing the hydrophilic phase into the lipophilic phase with stirring in order to form a dispersion of hydrophilic phase in lipophilic phase, and
d) once the dispersion is formed, polymerization of the monomers of the hydrophilic phase and polymerization of at least one monomer of formula (I).