Method of servicing a wellbore with an aqueous gel containing a friction reducer
View Patent ↗A well servicing fluid formulated with components comprising a friction reducer having at least one polymer unit chosen from acrylamide groups, acrylate groups, sulfo groups, and maleic acid groups; and an anionic surfactant, a cationic surfactant and an aqueous base capable of forming a viscoelastic gel. Methods of making the well servicing fluid and methods of employing the well servicing fluid in a well are also disclosed.
1. A method of servicing a wellbore, the method comprising:
introducing into the wellbore a well servicing fluid comprising an aqueous based gel and a friction reducer dissolved in the aqueous based gel, the friction reducer having at least one polymer unit chosen from acrylamide groups, acrylate groups, sulfo groups, and maleic acid groups; and the aqueous based gel comprising an anionic surfactant wherein the anionic surfactant is a salt of xylenesulfonate and a cationic surfactant wherein the cationic surfactant is N,N,N-trimethyl-1-octadecammonium chloride and wherein the concentration of friction reducer is about 0.5 pounds per thousand gallons or less, based on the total well servicing fluid.
2. The method of claim 1 , wherein the fluid further comprises a proppant.
3. The method of claim 2 , wherein the proppant comprises a ceramic material.
4. The method of claim 1 , wherein the friction reducer is a copolymer of sodium acrylate and acrylamide.
5. The method of claim 1 , wherein the friction reducer is a dry powder.
6. The method of claim 1 , wherein the friction reducer is anionic.
7. The method of claim 1 , wherein the friction reducer is cationic.
8. The method of claim 1 , wherein the friction reducer is nonionic.
9. The method of claim 1 , wherein the ratio by volume of anionic surfactant to cationic surfactant ranges from about 1:4 to about 4:1.
10. The method of claim 1 , wherein the aqueous base is a liquid chosen from fresh water, brine, and produced water.
11. The method of claim 1 , wherein the aqueous based gel is a fracturing fluid.
12. The method of claim 1 , wherein the fluid is formulated with at least one breaker.
13. The method of claim 1 , wherein the fluid is formulated with at least one additional compound chosen from water wetting surfactants, non-emulsifiers, additional viscosifying agents, additional surfactants, clay stabilization additives, scale dissolvers, biopolymer degradation additives, fluid loss control additives and high temperature stabilizers.
14. The method of claim 1 , wherein the fluid does not comprise mineral oil.
15. A method of fracturing a subterranean formation penetrated by a wellbore, the method comprising:
introducing into the wellbore at a pressure sufficient to initiate a fracture a well servicing fluid comprising an aqueous based gel and a friction reducer dissolved in the aqueous based gel, the friction reducer having at least one polymer unit chosen from acrylamide groups, acrylate groups, sulfo groups, and maleic acid groups; and the aqueous based gel comprising an anionic surfactant wherein the anionic surfactant is a salt of xylenesulfonate and a cationic surfactant wherein the cationic surfactant is N,N,N-trimethyl-1-octadecammonium chloride, wherein the concentration of friction reducer is about 0.5 pounds per thousand gallons or less, based on the total well servicing fluid.
16. The method of claim 15 , wherein the friction reducer is a copolymer of sodium acrylate and acrylamide.
17. The method of claim 15 , wherein the ratio by volume of anionic surfactant to cationic surfactant ranges from about 1:4 to about 4:1.
18. The method of claim 15 , wherein the aqueous base is a liquid chosen from fresh water, brine, and produced water.
19. A method of servicing a wellbore, the method comprising:
forming a well servicing fluid by blending a friction reducer having at least one polymer unit chosen from acrylamide groups, acrylate groups, sulfo groups, and maleic acid groups; an anionic surfactant, wherein the anionic surfactant is a salt of xylenesulfonate and a cationic surfactant wherein the cationic surfactant is N,N,N-trimethyl-1-octadecammonium chloride and an aqueous base under conditions sufficient to form an aqueous based gel comprising the friction reducer dissolved therein and wherein the concentration of friction reducer is about 0.5 pounds per thousand gallons or less, based on the total well servicing fluid; and introducing the well servicing fluid into the wellbore.
20. The method of claim 19 , wherein the method further comprises fracturing the wellbore with the well servicing fluid.
21. The method of claim 19 , wherein the method further comprises cleaning a tubular positioned within the wellbore with the well servicing fluid.
22. A method of reducing the friction of a viscoelastic gel during the pumping of the viscoelastic gel through pumping equipment and/or well tubulars within a wellbore, the method comprising introducing into the pumping equipment or wellbore a well servicing fluid comprising an aqueous based viscoelastic gel and a friction reducer dissolved in the aqueous based viscoelastic gel, the friction reducer having at least one polymer unit chosen from acrylamide groups, acrylate groups, sulfo groups, and maleic acid groups; and the aqueous based viscoelastic gel comprising an anionic surfactant wherein the anionic surfactant is a salt of xylenesulfonate and a cationic surfactant wherein the cationic surfactant is N,N,N-trimethyl-1-octadecammonium chloride and wherein the concentration of friction reducer is about 0.5 pounds per thousand gallons or less, based on the total well servicing fluid.
23. The method of claim 22 , wherein the ratio by volume of anionic surfactant to cationic surfactant ranges from about 1:4 to about 4:1.
24. The method of claim 22 , wherein the amount of friction reducer dissolved in the aqueous based viscoelastic gel is between from about 0.05 to about 0.25 pounds per thousand gallons (pptg).