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1. (WO2017035317) DILUTED CATIONIC FRICTION REDUCERS
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We Claim:

1. A water-in-oil emulsion having an oil phase (O) 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 comprises from about 1 to about 60 weight

percent of one or more cationic monomers, 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.

2. The water-in-oil emulsion according to claim 1, wherein the cationic monomer is selected from the group consisting of (meth)acrylamidopropyltrimethyl ammonium halides, (meth)acryloyloxyethyltrimethyl ammonium halides,

(meth)acryloyloxyethyltrimethyl ammonium methyl sulfate, diallyl dimethyl ammonium halides, diallylamine, methyldiallylamine, dimethylaminoethylmethacrylate, and dimethylaminopropylmethacrylamide.

3. The water-in-oil emulsion according to claim 1, wherein the water soluble polymer further comprises a non-ionic monomer.

4. The water-in-oil emulsion according to claim 2, wherein the nonionic monomer is selected from the group consisting of C1-C3 alkyl (meth)acrylates, C1-C3 N-alkyl (meth)acrylamide, (meth)acrylamide, N-vinylpyrrolidone, dimethyl(meth)acrylamide, N-vinyl acetamide, and N-vinyl formamide, and salts thereof.

5. The water-in-oil emulsion according to of claim 1, wherein the water soluble polymer has a molecular weight in the range of from about 1,000,000 to about

20,000,000.

6. The water-in-oil emulsion according to claim 1, wherein the polymer has a reduced viscosity, as determined in a Ubbelhhde Capillary Viscometer at 0.05% by weight concentration of the polymer in 1M NaCl solution, at 30°C, pH 7, of from about 5 to about 40 dl/g.

7. The water-in-oil emulsion according to claim 3, wherein the water-in-oil emulsion comprises ammonium salt, 4-methoxyphenol, and an ethoxylated C12-C16 alcohol; and wherein the inert hydrophobic liquid comprises a mixture of paraffinic hydrocarbons and napthenic hydrocarbons; and wherein the surfactants comprise a tall oil fatty acid diethanol amine, a polyoxyethylene (5) sorbitan monooleate, and a sorbitan monooleate; and wherein acrylamide is present in the water soluble polymer in an amount from about 10 weight percent to about 99 weight percent, wherein the amount is by total weight of the water soluble polymer.

8. A method of treating a portion of a subterranean formation comprising the steps of:

(a) providing the water-in-oil emulsion of claim 1 ;

(b) inverting the water-in-oil emulsion by adding it to water at from about 0.1 to about 5 gallons of water-in-oil emulsion per thousand gallons of water to form a friction reducing treatment solution containing from about 0.0005 weight percent to about 0.12 weight percent water soluble polymer based on the weight of the treatment solution; and

(c) introducing the treatment solution into the portion of the subterranean formation.

9. The method of claim 7, wherein the friction reducing treatment solution is introduced into the portion of the subterranean formation at a rate and pressure sufficient to create or enhance one or more fractures in the portion of the subterranean formation.

10. The method of claim 7, wherein the water-in-oil emulsion further comprises at least one additive selected from the group consisting of inhibitors, salts, inverting surfactants, and combinations thereof.

11. The method of claim 7, wherein the water-in-oil emulsion comprises ammonium salt, 4-methoxyphenol, and an ethoxylated C12-C16 alcohol; and wherein the inert hydrophobic liquid comprises a mixture of paraffinic hydrocarbons and napthenic hydrocarbons; and wherein the surfactants comprise a tall oil fatty acid diethanol amine, a polyoxyethylene (5) sorbitan monooleate, and a sorbitan monooleate; and wherein acrylamide is present in the water soluble polymer in an amount from about 10 weight percent to about 99 weight percent, wherein the amount is by total weight of the water soluble polymer.

12. The method of claim 7, wherein the water-in-oil emulsion is present in the friction reducing treatment solution in an amount in the range of from about 0.1 to about 3 gallons of water-in-oil emulsion per thousand gallons of 2% KC1 solution (gpt).

13. The method of claim 7, wherein the water soluble polymer comprises one or more monomers selected from the group consisting of (meth)acrylamidopropyltrimethyl ammonium halides, (meth)acryloyloxyethyltrimethyl ammonium halides,

(meth)acryloyloxyethyltrimethyl ammonium methyl sulfate, diallyl dimethyl ammonium halides, diallylamine, methyldiallylamine, dimethylaminoethylmethacrylate, and dimethyl ami nopropy lmethacry 1 ami de .

14. The method of claim 7, wherein the water soluble polymer further comprises a non-ionic monomer.

15. The method of claim 14, wherein the non-ionic monomer is selected from the group consisting of C1-C3 alkyl (meth)acrylates, C1-C3 N-alkyl (meth)acrylamide, (meth)acrylamide, N-vinylpyrrolidone, dimethyl(meth)acrylamide, N-vinyl acetamide, N-vinyl formamide, reaction products, salts and combinations thereof.