High viscosity friction reducer for fracturing fluid

Patent metadata

Field	Value
Publication number	US-11732185-B2
Application number	US-202117371736-A
Country	US
Kind code	B2
Filing date	Jul 9, 2021
Priority date	Jul 10, 2020
Publication date	Aug 22, 2023
Grant date	Aug 22, 2023

Abstract

A friction reducer includes a polysaccharide-graft-water-soluble polymer is provided. A polysaccharide in an amount of from about 0.1 to 50% by weight (wt. %) may make up the polysaccharide-graft-water-soluble polymer. A wellbore treatment fluid is provided that includes an aqueous base fluid and the friction reducer in an amount up to about 10% of the wellbore treatment fluid. A method of using a wellbore treatment fluid includes the step of introducing the wellbore treatment fluid as previously provided into a wellbore.

First claim

What is claimed is:

1. A friction reducer comprising a polysaccharide-graft-water-soluble polymer (polysaccharide-g-water-soluble polymer),
where a portion of the friction reducer that is polysaccharide is in a range of from about 1 to 15% by weight (wt. %), and
where a first aqueous solution comprising the friction reducer as compared to a second aqueous solution comprising the friction reducer has a difference in rotational viscosity values at a shear speed of about 300 revolutions per minute (RPM) in a range of from about 0.01 to 25%, where a concentration of the friction reducer in both the first aqueous solution and the second aqueous solution is the same and where a total dissolved solids (TDS) in the first aqueous solution is greater than 50,000 mg/L and in the second aqueous solution is less than 1,000 mg/L.

2. The friction reducer of claim 1 , where the polysaccharide of the friction reducer is selected from the group consisting of guar gum, starch, cellulose, dextran, xanthan, chitin, scleroglucan, chitosan, gellan gum, arabic gum, alginate, curdlan, hyaluronic acid, lentinan, levan, pullulan, schizophyllan, stewartan, succinoglycan, welan, derivatives thereof, and combinations thereof.

3. The friction reducer of claim 1 , where the water-soluble polymer of the friction reducer is selected from the group consisting of a homopolymer or a copolymer, where the water-soluble polymer is a polymerization product of at least one water-soluble monomer.

4. The friction reducer of claim 3 , where the at least one water-soluble monomer is selected from the group consisting of acrylamides, acrylates, acetates, acetamides, formamides, (meth)acrylamides, C 1 -C 3 N-alkyl(meth)acrylamide, N,N-dimethylacrylamide, dimethyl(meth)acrylamide, N-vinylpyrrolidone, N-vinyl acetamide, 4-acryloylmorpholine, N-isopropylacrylamide, N-(hydroxymethyl)acrylamide, N-(hydroxyethyl)acrylamide, N-[tris(hydroxymethyl)methyl]acrylamide, N-vinyl acetate, N-vinyl formamide, and derivatives thereof.

5. The friction reducer of claim 3 , where the copolymer is a polymerization product of at least one water-soluble monomer and at least one functional monomer.

6. The friction reducer of claim 5 , where the at least one functional monomer is selected from the group consisting of a cationic monomer and an anionic monomer.

7. The friction reducer of claim 6 , where the cationic monomer is selected from the group consisting of (meth)acrylamidopropyltrimethyl ammonium halides, (meth)acryloyloxyethyltrimethyl ammonium halides, (meth)acryloyloxyethyltrimethyl ammonium methyl sulfates, diallyl dimethyl ammonium halides, diallylamines, methyldiallylamines, dimethylaminoethylmethacrylates, dimethylaminopropylmethacrylamides, derivatives thereof, and combinations thereof.

8. The friction reducer of claim 6 , where the anionic monomer is selected from the group consisting of (meth)acrylic acid, salts of (meth)acrylic acid, acrylic acid, sodium acrylate, ammonium acrylate, methacrylic acid, sodium methacrylate; 2-acrylamido-2-methylpropanesulfonic acid (AMPS), sodium salt of AMPS; vinyl sulfonic acid, salts of vinyl sulfonic acid, sodium vinyl sulfonate, styrene sulfonic acid, salts of styrene sulfonic acid; sulfomethylated acrylamide, allyl sulfonate, vinylphosphonic acid, allylphosphonic acid, phosphonomethylated acrylamide, derivatives thereof, and combinations thereof.

9. The friction reducer of claim 1 , where the friction reducer is selected from the group consisting of starch-g-polyacrylamide, guar-g-polyacrylamide, and combinations thereof.

10. The friction reducer of claim 1 , where an aqueous solution comprising 0.5 wt. % of the friction reducer as compared to a similar aqueous solution that does not comprise the friction reducer has an amount of friction reduction in a range of from about 50% to about 85%.

11. A wellbore treatment fluid, comprising:
an aqueous base fluid; and
a friction reducer, where the friction reducer comprises a polysaccharide-graft-water-soluble polymer (polysaccharide-g-water-soluble polymer),
where a portion of the friction reducer that is polysaccharide is in a range of from about 1 to 15% by weight (wt. %), and
where a first aqueous solution comprising the friction reducer as compared to a second aqueous solution comprising the friction reducer has a difference in rotational viscosity values at a shear speed of about 300 revolutions per minute (RPM) in a range of from about 0.01 to 25%, where a concentration of the friction reducer in both the first aqueous solution and the second aqueous solution is the same and where a total dissolved solids (TDS) in the first aqueous solution is greater than 50,000 mg/L and in the second aqueous solution is less than 1,000 mg/L;

where an amount of the friction reducer in the wellbore treatment fluid is in a range of from about 0.01 to 10 wt. % (weight percent).

12. The wellbore treatment fluid of claim 11 , where the water-soluble polymer of the friction reducer is selected from the group consisting of a homopolymer or a copolymer, where the water-soluble polymer is a polymerization reaction product of at least one water-soluble monomer.

13. The wellbore treatment fluid of claim 12 , where the copolymer is a polymerization product of at least one water-soluble monomer and at least one functional monomer.

14. The wellbore treatment fluid of claim 11 , where the aqueous base fluid is a synthetic or natural seawater or brine having a total dissolved solids (TDS) content in a range of from about 1,000 to 350,000 mg/L (milligrams per liter).

15. The wellbore treatment fluid of claim 11 , where the friction reducer is selected from the group consisting of starch-g-polyacrylamide, guar-g-polyacrylamide, and combinations thereof.

16. A method of using a wellbore treatment fluid, comprising:
introducing the wellbore treatment fluid into the wellbore, the wellbore treatment fluid comprising an aqueous base fluid and a friction reducer, where the friction reducer comprises a polysaccharide-graft-water-soluble polymer (polysaccharide-g-water-soluble polymer),
where a portion of the friction reducer that is polysaccharide is in a range of from about 1 to 15% by weight (wt. %), and
where a first aqueous solution comprising the friction reducer as compared to a second aqueous solution comprising the friction reducer has a difference in rotational viscosity values at a shear speed of about 300 revolutions per minute (RPM) in a range of from about 0.01 to 25%, where a concentration of the friction reducer in both the first aqueous solution and the second aqueous solution is the same and where a total dissolved solids (TDS) in the first aqueous solution is greater than 50,000 mg/L and in the second aqueous solution is less than 1,000 mg/L;

where an amount of the friction reducer in the wellbore treatment fluid is in a range of from about 0.01 to 10 wt. % (weight percent).

17. The method of claim 16 , where the introduction of the wellbore treatment fluid is at a pressure greater than the fracture pressure of a hydrocarbon-bearing formation in fluid communication with the wellbore.

18. The method of claim 16 , where the friction reducer is selected from the group consisting of starch-g-polyacrylamide, guar-g-polyacrylamide, and combinations thereof, and where the aqueous base fluid is a synthetic seawater.

Assignees

• Aramco Services Co
• Saudi Aramco Oil Company

Inventors

• Li Wenwen
• Saini Rajesh
• Rimassa Shawn

Classifications

• C09K8/90 Primary

  of natural origin, e.g. polysaccharides, cellulose · CPC title

• C08F251/00

  Macromolecular compounds obtained by polymerising monomers on to polysaccharides or derivatives thereof · CPC title

• C09K2208/28

  Friction or drag reducing additives · CPC title

• C09K8/035 Primary

  Organic additives · CPC title

• C09K8/68

  containing organic compounds · CPC title