Polymer Crosslinking System Comprising Soluble Zr(IV),...

Earth boring – well treating – and oil field chemistry – Well treating – Contains inorganic component other than water or clay

Reexamination Certificate

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C166S308100, C166S308300, C166S308500, C507S211000, C507S213000, C507S214000

Reexamination Certificate

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07345013

ABSTRACT:
A composition useful for making gelled fluids by crosslinking hydratable polymers is an aqueous solution of zirconium complexed with carbonate and bicarbonate as the only multidentate ligands complexed with zirconium. The composition also provides pH modifying capability and the crosslinking is delayed, so that the single composition replaces several liquid additives previously necessary for generation of fluids used, for example, in hydraulic fracturing.

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patent: 5972850 (1999-10-01), Nimerick
patent: 6737386 (2004-05-01), Moorhouse et al.
patent: 2006/0046937 (2006-03-01), Fu et al.

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