Cross-linking composition and method of use
AssigneeE.I. du Pont de Nemours and Company
InventorDonald Edward Putzig
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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.
Claims17
A cross-linking composition comprising (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, wherein the organic titanate is selected from the group consisting of titanium a-hydroxycarboxylic acid salt, titanium polyol complexes, titanium alkanol amine complexes, and combinations thereof;
- and wherein the organic zirconate is selected from zirconium a-hydroxycarboxylic acid salt, zirconium polyol complexes, zirconium alkanol amine complexes, zirconium hydroxyalkylated alkylenediamine complexes, and combinations thereof;
- and (e) a delay agent which is a hydroxyalkylaminocarboxylic acid.
Dependencies are inferred from the claim text.