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US Patent 7732382 Cross-linking composition and method of use

Patent 7732382 was granted and assigned to E.I. Du Pont De Nemours And Company on June, 2010 by the United States Patent and Trademark Office.

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Patent abstract

A cross-linking composition comprises (a) an aqueous liquid, (b) a pH buffer, (c) a cross-linkable organic polymer, (d) a cross-linking agent which comprises an organic titanate, an organic zirconate, or combinations thereof, and (e) a delay agent which is a hydroxyalkylaminocarboxylic acid. The composition provides flexibility in rate of cross-linking and can be used over a wide range of pH. Further disclosed are methods to use the composition in oil field applications for hydraulic fracturing and plugging of permeable zones and leaks in subterranean formations.

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