Degradation agent for viscous fluid and method for producing said degradation agent
AssigneeMitsubishi Gas Chemical Company, Inc.
InventorsNorifumi Tashiro, Katsuyuki Murai
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Abstract
A degradation agent for viscous fluids to be used in hydraulic fracturing methods is provided according to one aspect of the present invention, the degradation agent comprising a persulfate and an iron salt serving as an activator for the persulfate, wherein the persulfate and the iron salt have been coated and the ratio of the coating-film thickness (Y) in the iron salt to the coating-film thickness (X) in the persulfate, Y/X, is in the range of 0.35 to 1.0. The degradation agent for viscous fluids has properties suitable for use in hydraulic fracturing methods.
Claims10
A degradation agent for a viscous fluid used in a hydraulic fracturing method, the agent comprising a persulfate and an iron salt as an activator of said persulfate, wherein:
- each of the persulfate and the iron salt is coated;
- and
- the ratio (Y/X) of the coating-film thickness of the iron salt (Y) to the coating-film thickness of the persulfate (X) is in the range of 0.35 to 1.0.
A method for producing a degradation agent for a viscous fluid used in a hydraulic fracturing method, the method comprising:
- coating a persulfate to obtain a coated persulfate;
- coating an iron salt to obtain a coated iron salt;
- and
- mixing the coated persulfate and the coated iron salt,
- wherein the ratio (Y/X) of the coating-film thickness of the iron salt (Y) to the coating-film thickness of the persulfate (X) is in the range of 0.35 to 1.0.
A method for degrading a viscous fluid used in a hydraulic fracturing method, the method comprising adding a coated persulfate and a coated iron salt as an activator of said persulfate to the viscous fluid,
- wherein the ratio (Y/X) of the coating-film thickness of the iron salt (Y) to the coating-film thickness of the persulfate (X) is in the range of 0.35 to 1.0.
Dependencies are inferred from the claim text.