US 12,129,424 B2
Friction reducers for high TDS brines
Roopa Tellakula, Suwanee, GA (US); Louis Rosati, Atlanta, GA (US); Ronald Robinson, Newnan, GA (US); and Samuel Hanson, Atlanta, GA (US)
Assigned to STERLING SPECIALTY CHEMICALS HOLDING UK LIMITED, (GB)
Appl. No. 17/629,729
Filed by Sterling Specialty Chemicals Holding UK Limited, Harrow (GB)
PCT Filed Jul. 20, 2020, PCT No. PCT/US2020/042719
§ 371(c)(1), (2) Date Jan. 24, 2022,
PCT Pub. No. WO2021/016155, PCT Pub. Date Jan. 28, 2021.
Claims priority of provisional application 62/876,207, filed on Jul. 19, 2019.
Claims priority of application No. 20195745 (FI), filed on Oct. 9, 2019.
Prior Publication US 2023/0019003 A1, Jan. 19, 2023
Int. Cl. C09K 8/36 (2006.01); C09K 8/68 (2006.01); C09K 8/80 (2006.01); C09K 8/88 (2006.01)
CPC C09K 8/36 (2013.01) [C09K 8/68 (2013.01); C09K 8/80 (2013.01); C09K 8/88 (2013.01); C09K 2208/28 (2013.01)] 10 Claims
OG exemplary drawing
 
1. An emulsion comprising:
water;
a water-immiscible liquid;
greater than about 10% by weight of one or more polymers comprising one or more acrylamide monomers, and at least one anionic monomer, and salts and mixtures thereof; and
about 0.1% to about 5% by weight of an inverting surfactant composition comprising one or more alkyl polyethyleneglycol ether carboxylic acid compounds or salts or esters thereof, one or more ethoxylated fatty acid compounds or salts or esters thereof, and one or more ethoxylated alcohol compounds or salts or esters thereof,
wherein the one or more ethoxylated alcohol compounds or salts or esters thereof comprises a secondary alcohol ethoxylate of the formula C11-15H23-31O(CH2CH2O)40H, and wherein the one or more ethoxylated alcohol compounds or salts or esters thereof is present in the inverting surfactant composition at a concentration of from about 10% to about 25% by weight based on the weight of the inverting surfactant composition,
wherein the one or more alkyl polyethyleneglycol ether carboxylic acid compounds or salts or esters thereof is present in the inverting surfactant composition at a concentration of about 60% to about 75% by weight based on the weight of the inverting surfactant composition,
wherein the one or more ethoxylated fatty acid compounds or salts or esters thereof is present in the inverting surfactant composition at a concentration of about 10% to about 25% by weight based on the weight of the inverting surfactant composition, and
wherein when the emulsion is present in a brine at a temperature of 77 ºF±3 ºF, and a concentration of 0.5 grams per thousand gallons of the brine, and wherein the brine has 225,000 ppm of total dissolved solids, the emulsion achieves a maximum friction reduction (Max FR) of at least about 63%, and a time to 90% friction reduction (t90) of about 21 seconds or less.