Patent ID: 9102866
Filing Date: 2015-08-11
Classification: C09K,E21B

Abstract:
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.