US 11,746,277 B2
Diluted cationic friction reducers
Kailas Sawant, Mars, PA (US); Louis Villafane, Pittsburgh, PA (US); Kevin Frederick, Evans City, PA (US); Shih-Ruey Chen, Studio City, CA (US); and Randy Loeffler, Carnegie, PA (US)
Assigned to ENERGY SOLUTIONS (US) LLC, Princeton, NJ (US)
Filed by ENERGY SOLUTIONS (US) LLC, Princeton, NJ (US)
Filed on Sep. 30, 2021, as Appl. No. 17/491,044.
Application 17/491,044 is a continuation of application No. 15/755,113, granted, now 11,162,011, issued on Nov. 2, 2021, previously published as PCT/US2016/048591, filed on Aug. 25, 2016.
Claims priority of provisional application 62/210,161, filed on Aug. 26, 2015.
Prior Publication US 2022/0017808 A1, Jan. 20, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. C09K 8/64 (2006.01); C09K 8/36 (2006.01); C09K 8/82 (2006.01); C09K 8/72 (2006.01)
CPC C09K 8/36 (2013.01) [C09K 8/64 (2013.01); C09K 8/725 (2013.01); C09K 8/82 (2013.01); C09K 2208/28 (2013.01)] 9 Claims
 
1. A water-in-oil emulsion having an oil phase (0) and an aqueous phase (A) at an O/A ratio of from about 1:8 to about 10:1;
wherein the water-in-oil emulsion includes the oil phase as a continuous phase comprising an inert hydrophobic liquid, and the aqueous phase as a dispersed phase of distinct particles in the oil phase comprising water, a water soluble polymer, and at least one surfactant;
wherein the water soluble polymer consists of from 40 to 60 weight percent of (meth)acrylamide and from 40 to 60 weight percent of cationic monomers selected from the group consisting of (meth)acryloyloxyethyl trimethylammonium chloride (AETAC); (meth)acryloyloxyethyl trimethylammonium chloride (AETAC) and diallyldimethylammonium chloride (DAD MAC); (meth)acryloyloxyethyl trimethylammonium chloride (AETAC) and (meth)acrylamidopropyltrimethylammonium chloride (MAPTAC); and (m eth)acryloyloxyethyl trimethylammonium chloride (AETAC), diallyldimethylammonium chloride (DADMAC) and (meth)acrylamidopropyltrimethylammonium chloride (MAPTAC), wherein the amount is by total weight of the water-soluble polymer;
wherein the water soluble polymer is present in an amount from about 5 to about 40 weight percent of the water-in-oil emulsion; and
wherein an aqueous solution prepared by inverting the water-in-oil emulsion by adding it to water has at least comparable viscosity build to an aqueous solution made from a water-in-oil emulsion of the same composition containing 15 weight percent more water soluble polymer.