Method for stimulating subterranean formations
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United States of America Patent
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Nov 24, 1992
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N/A
app pub date -
Jul 22, 1991
filing date -
Jul 22, 1991
priority date (Note) -
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Abstract
The present invention provides a method of treating a subterranean formation utilizing a gelled fluid containing a galactomannan gum and a crosslinking agent comprising a source of borate ions and a delayed crosslinker comprising a source of Ti(+4) or Zr(+4) ions. The combination of crosslinking agents yields a viscous fluid at elevated temperatures having a viscosity higher than attainable by either crosslinking agent alone or as the result of the additive effects of the crosslinking agents. The enhanced viscosity facilitates transport and placement of proppant material in a subterranean formation.
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