Fracturing fluid viscosity-controlling agent to be used in hydraulic fracturing
AssigneeSumitomo Seika Chemicals Co., Ltd.
InventorsToru Ido, Noboru Yamaguchi
Life of this patent
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Abstract
A fracturing fluid viscosity-controlling agent maintains the high viscosity of the fracturing fluid during fracture formation in hydraulic fracturing and reduces the viscosity during recovery of the fracturing fluid. A fracturing fluid which includes the viscosity-controlling agent is provided as well as a crude oil or natural gas drilling method using the fracturing fluid with the viscosity-controlling agent. This viscosity-controlling agent contains polyalkylene oxide and a viscosity-reducing agent and is in the form of a tablet.
Claims7
A viscosity controlling agent for controlling a change in viscosity of a fracturing fluid to be used in hydraulic fracturing,
- wherein the viscosity controlling agent is in tablet form, wherein each tablet has a mass of 0.5 to 10 g, and comprises a polyalkylene oxide and a viscosity reducing agent,
- wherein the viscosity controlling agent is dissolved in the fracturing fluid, and the polyalkylene oxide has a viscosity of:
- (a) 20 to 1,500 mPa_s in a form of a 0.5 mass % aqueous solution at 25° C., or
- (b) 50 to 80,000 mPa_s in a form of a 5 mass % aqueous solution at 25° C.,
- wherein a ratio of the polyalkylene oxide in the viscosity controlling agent is 70 to 99.99% by mass relative to the total amount of the viscosity controlling agent,
- wherein the viscosity reducing agent is at least one selected from the group consisting of a radical generator, an acid and an enzyme.
Dependencies are inferred from the claim text.