Radical trap in oil and gas stimulation operations
First Claim
1. A method for using a fracture fluid in forming subterranean fractures comprising delaying degradation of a polymer or polymeric viscosifying agent in a fracture fluid at a temperature from about 125°
- F. to about 450°
F., when the fracture fluid comprises at least one polymer or polymeric viscosifying agent, a breaker and water, by combining at least one radical scavenger with the fracture fluid, wherein the radical scavenger comprises at least one moiety selected from the group consisting of nitroxide radicals, quinones, hindered phenols, hydroxylamines, and slow polymerizing monomers, 2,2,6,6-tetramethylpiperidine-1-oxyl;
4-hydroxy-2,2,6,6-tetramethylpiperidine-1-oxyl;
nitroxide;
1-(diethoxyphosphinyl)-2,2-dimethylpropyl 1,1-dimethylethyl, mono-t-butyl hydroquinone and mixtures thereof; and
wherein the breaker is selected from the group consisting of organic peroxides, inorganic peroxides, azo initiators, bromates, chlorates, persulfates, and mixtures thereof.
1 Assignment
0 Petitions
Accused Products
Abstract
A method for using a fracture fluid in forming subterranean fractures includes delaying degradation of a polymer in a fracture fluid when the fracture fluid comprises a breaker by combining at least one radical scavenger with the fracture fluid. The mixture for use in a fracture fluid comprises a radical scavenger and a breaker. A method of fracturing a subterranean formation may include providing a fracture fluid comprising a proppant, a polymer, and a breaker and adding a radical scavenger to the fracture fluid. The fracture fluid is supplied to a desired location in the subterranean formation to form at least one fracture where the viscosity of the fracture fluid is maintained. The breaker is then allowed to degrade the polymer and reduce the viscosity of the fracture fluid at a specific time or temperature.
-
Citations
18 Claims
-
1. A method for using a fracture fluid in forming subterranean fractures comprising delaying degradation of a polymer or polymeric viscosifying agent in a fracture fluid at a temperature from about 125°
- F. to about 450°
F., when the fracture fluid comprises at least one polymer or polymeric viscosifying agent, a breaker and water, by combining at least one radical scavenger with the fracture fluid, wherein the radical scavenger comprises at least one moiety selected from the group consisting of nitroxide radicals, quinones, hindered phenols, hydroxylamines, and slow polymerizing monomers, 2,2,6,6-tetramethylpiperidine-1-oxyl;
4-hydroxy-2,2,6,6-tetramethylpiperidine-1-oxyl;
nitroxide;
1-(diethoxyphosphinyl)-2,2-dimethylpropyl 1,1-dimethylethyl, mono-t-butyl hydroquinone and mixtures thereof; and
wherein the breaker is selected from the group consisting of organic peroxides, inorganic peroxides, azo initiators, bromates, chlorates, persulfates, and mixtures thereof. - View Dependent Claims (2, 3, 4, 5, 6, 7)
- F. to about 450°
-
8. A mixture for use in a fracture fluid at a temperature from about 125°
- F. to about 450°
F., said fracture fluid comprising at least one polymer or polymeric viscosifying agent and water, said mixture comprising a radical scavenger and a breaker, wherein the radical scavenger comprises at least one moiety selected from the group consisting of nitroxide radicals, quinones, hindered phenols, hydroxylamines, and slow polymerizing monomers, 2,2,6,6-tetramethylpiperidine-1-oxyl;
4-hydroxy-2,2,6,6-tetramethylpiperidine-1-oxyl;
nitroxide, 1-(diethylphosphinyl)-2,2-dimethylpropyl 1,1-dimethylethyl, mono-t-butyl hydroquinone, and mixtures thereof; and
wherein the breaker is selected from the group consisting of organic peroxides, inorganic peroxides, azo initiators, bromates, chlorates, persulfates, and mixtures thereof. - View Dependent Claims (9, 10, 11, 12, 13)
- F. to about 450°
-
14. A fracture fluid mixture comprising:
-
a proppant; a water soluble or water swellable polymer selected from the group consisting of polysaccharides, polysaccharide derivatives, polyacrylates, polyacrylamides, acrylamide methyl propane sulfonic acid copolymers, polyvinyl alcohols, polylactic acids, polyvinyl pyrrolidones, maleic anhydride, methyl vinyl ether copolymers, polyethylene oxides; and
mixtures thereof;a radical scavenger comprising at least one moiety selected from the group consisting of nitroxide radicals, quinones, hindered phenols, hydroxylamines, and slow polymerizing monomers, 2,2,6,6-tetramethylpiperidine-1-oxyl;
4-hydroxy-2,2,6,6-tetramethylpiperidine-1-oxyl;
nitroxide, 1-(diethoxyphosphinyl)-2,2-dimethylpropyl 1,1-dimethylethyl, mono-t-butyl hydroquinone, and mixtures thereof;a breaker; and an aqueous fluid. - View Dependent Claims (15, 16, 17, 18)
-
Specification