Well treatment fluid compositions and methods for their use
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United States of America Patent
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Jan 10, 2006
Grant Date -
Jan 27, 2005
app pub date -
Aug 23, 2004
filing date -
Jan 9, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A well treatment fluid composition comprises a solvent (such as water), a polymer soluble or hydratable in the solvent, a crosslinking agent, an inorganic breaking agent, and an ester compound. Preferably, the hydratable polymer is a polysaccharide, such as galactomannan, cellulose, or derivatives thereof. The crosslinking agent is preferably a borate, titanate, or zirconium-containing compound. The inorganic breaking agent is preferably a metal-based oxidizing agent, such as an alkaline earth metal or transition metal-based oxidizing agent. The ester compound is preferably an ester of polycarboxylic acid, such as an ester of oxalate, citrate, or ethylenediamine tetraacetate. One example of a suitable ester compound is acetyl triethyl citrate.
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