Method of using borate crosslinked fracturing fluid having incre

Details Method of using borate crosslinked fracturing fluid having incre Method of using borate crosslinked fracturing fluid having incre

1992-05-18

1993-11-09

Suchfield, George A.

Wells

Processes

Placing fluid into the formation

E21B 4326

Patent

active

052594556

ABSTRACT:
The present invention extends the temporary temperature range for the use of magnesium oxide-delayed borate-cross linking of a galactomannan gum fracturing fluid by adding fluoride ion which precipitates insoluble magnesium fluoride. Alternatively, a chelant for the magnesium ion may be added. With the precipitation of magnesium fluoride, or the chelation of the magnesium ion, insoluble magnesium hydroxide cannot form at elevated temperatures which would otherwise lower the pH and reverse the boron-crosslinking reacting. The addition effectively extends the use of such fracturing fluids to temperatures of about 275.degree. to 300.degree. F.

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patent: 4514309 (1985-04-01), Wadhwa
patent: 4619776 (1986-10-01), Mondshine
patent: 5160445 (1992-11-01), Sharif
patent: 5165479 (1992-11-01), Harris et al.

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