Delayed borate crosslinked fracturing fluid having increased temperature range
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United States of America Patent
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Aug 29, 1995
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N/A
app pub date -
Mar 15, 1994
filing date -
Mar 15, 1994
priority date (Note) -
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Abstract
The crosslinking of galactomannan gum fracturing fluids by borate ion is delayed for high-temperature applications by encapsulating the boron with a polymer coating. The crosslink-delay time is further adjusted by varying the concentration of an organic polyol. The polyol also acts as a stabilizer for the crosslinked fluid at elevated temperatures. Low pumping friction pressures are achieved by the delay in the crosslinking with the boron available at high temperatures to add high temperature stability to the fracturing fluid at temperatures ranging up to about 350.degree. F.
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