US 12,404,446 B2
Dispersion of water-soluble polymer for hydraulic fracturing
Cédrick Favero, Andrezieux (FR); Bruno Tavernier, Andrezieux (FR); Sebastien Coccolo, Andrezieux (FR); and Siham Telilel, Andrezieux (FR)
Assigned to SNF Group, Andrezieux-Boutheon (FR)
Appl. No. 18/689,064
Filed by SNF GROUP, Andrezieux-Boutheon (FR)
PCT Filed Sep. 13, 2022, PCT No. PCT/EP2022/075444
§ 371(c)(1), (2) Date Mar. 4, 2024,
PCT Pub. No. WO2023/041539, PCT Pub. Date Mar. 23, 2023.
Claims priority of application No. 2109669 (FR), filed on Sep. 15, 2021.
Prior Publication US 2024/0384159 A1, Nov. 21, 2024
Int. Cl. C09K 8/68 (2006.01); C09K 8/88 (2006.01)
CPC C09K 8/68 (2013.01) [C09K 8/88 (2013.01); C09K 2208/28 (2013.01)] 12 Claims
 
1. An injection fluid for hydraulic fracturing comprising a synthetic water-soluble polymer with a weight average molecular weight greater than or equal to 1 million daltons, prepared according to a method comprising:
preparing, by radical polymerization, an inverse emulsion comprising between 15% and 40% by weight of the polymer, between 20% and 60% by weight of water and at least one hydrocarbon-based solvent, the percentages being expressed by weight relative to the weight of the emulsion;
distilling the emulsion to obtain a dispersion comprising between 40% and 60% by weight of particles of the polymer, less than 10% by weight of water and at least one hydrocarbon-based solvent, the percentages being expressed by weight relative to the weight of the dispersion; and
diluting the dispersion with 1% to 15% by weight of an aqueous solution comprising between 20% and 60% of salts, the percentages being expressed by weight relative to the weight of the dispersion.