US 11,773,199 B2
Auto-invertible inverse polymer emulsion
Cédrick Favero, Andrezieux Boutheon (FR); Olivier Braun, Andrezieux Boutheon (FR); and Thierry Leblanc, Andrezieux Boutheon (FR)
Assigned to SNF GROUP, Andrezieux Boutheon (FR)
Filed by SNF Group, Andrezieux Boutheon (FR)
Filed on Dec. 21, 2022, as Appl. No. 18/69,623.
Application 18/069,623 is a division of application No. 17/288,962, granted, now 11,584,819, previously published as PCT/FR2019/052606, filed on Nov. 4, 2019.
Claims priority of application No. 1860204 (FR), filed on Nov. 6, 2018.
Prior Publication US 2023/0126767 A1, Apr. 27, 2023
Int. Cl. E21B 43/20 (2006.01); E21B 43/267 (2006.01); C09K 8/588 (2006.01); C09K 8/60 (2006.01); C09K 8/80 (2006.01); C08F 220/56 (2006.01); C09K 8/64 (2006.01)
CPC C08F 220/56 (2013.01) [C09K 8/588 (2013.01); C09K 8/64 (2013.01); C09K 8/80 (2013.01); E21B 43/20 (2013.01); E21B 43/267 (2013.01); C08F 2800/10 (2013.01)] 17 Claims
OG exemplary drawing
 
1. An auto-invertible inverse emulsion comprising:
oil;
water;
at least one water-in-oil surfactant; and
at least one polymer having a molecular weight of between 5 and 30 million g/mol and containing:
monomer units of at least one water-soluble monomer selected from acrylamide, 2-acrylamido 2-methylpropane sulfonic acid (ATBS), acrylic acid (AA), and quaternized or salified dimethylaminoethyl acrylate (ADAME), and
10−5 to 5 mol % of a lower critical solution temperature (LCST) macromonomer, said LCST macromonomer having a molecular weight of between 500 and 200,000 g/mol and having units from:
at least one monomer selected from AA, ATBS, and quaternized or salified dimethylaminoethyl methacrylate (MADAME); and
at least one LCST monomer selected from diethylacrylamide, N-isopropylacrylamide, dimethylacrylamide, and ter-butylacrylamide,
provided that where the monomer units of the at least one water-soluble monomer are units of ATBS, the LCST macromonomer does not have units from AA or ATBS.