Polymer Crosslinking System Comprising Soluble Zr(IV), Carbonate and Bicarbonate Ions
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United States of America Patent
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Mar 18, 2008
Grant Date -
Aug 24, 2006
app pub date -
Feb 23, 2005
filing date -
Feb 23, 2005
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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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