Oxidation of sulfides in polymer-thickened aqueous solution
CA 1262783 C · Owner: Fmc Corporation · Inventors: Norris, Robert D.; Brown, Richard A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for preferentially oxidizing sulfide in a viscous, aqueous solution of a hydratable polymeric material suitable for use in hydraulically treating subterranean formations. The sulfide is oxidized by incorporating hydrogen peroxide and a free radical scavenger into the aqueous solution at a pH between 3 and 10. After oxidation of the sulfide the stability of hydratable polymers is at least as good as in the original solution.
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted November 7, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 7, 2006.
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.