Method Of Chemically Delaying Peroxygen Based Viscosity Reduction Reactions
AssigneeOrin Technologies, LLC
InventorsAdam Mohs, Marc Baures, Larry Kinsman
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Abstract
A method of time delayed reduction in the molecular weight of polymers in a viscosified fluid and a method of time delayed breaking of viscosified fluids through treatment of the viscosified fluid with a viscosity breaking composition. The viscosity breaking composition is formed from a peroxygen compound, a peroxygen inhibiting agent and a peroxygen catalyzing agent, where the relative concentration of the components determines the duration of the a time interval require for breaking the viscosified fluid.
Claims23
A method of time delayed breaking viscosified fluids in an underground formation comprising the steps of:
- (a) treating a viscosified fluid with a viscosity breaking composition to provide a time delayed reduction of viscosity of the viscosified fluid occurring over a predetermined interval of time resulting in a reduced viscosity fluid;
- (b) before expiration of the predetermined interval of time, introducing the viscosified fluid treated with the viscosity breaking composition underground;
- and
- (c) over the predetermined interval of time, converting the viscosified fluid to a reduced viscosity fluid having a viscosity lower than the viscosified fluid.
A viscosity breaking composition for reducing a molecular weight of polymers in a viscosified fluid, the composition comprising:
- a first volume of a peroxygen compound selected from a group consisting of organic peroxides, inorganic peroxides, persulfate salts, percarbonate salts, perborate salts, and combinations thereof;
- and
- a second volume of a peroxygen inhibiting agent selected from a group consisting of phosphoric acid, stannic acid, stannate, nitrates, organophosphates, phosphate salts and combinations thereof.
- wherein a relative ratio of the first and second volumes determine a time delay for reducing the molecular weight of polymers in the viscosified fluid after introducing the viscosity breaking composition to the viscosified fluid.
Dependencies are inferred from the claim text.