Method for delaying the gellation of borated galactomannans with

Details Method for delaying the gellation of borated galactomannans with Method for delaying the gellation of borated galactomannans with

1991-12-02

1992-11-03

Stoll, Robert L.

Compositions

Leather or fur treating

2523153, 166308, E21B 4326

Patent

active

051606437

ABSTRACT:
A complexor and method of use are shown for providing controlled delay of the cross-linking reaction in an aqueous well fracturing fluid. A base fluid is first prepared by blending together an aqueous fluid and a hydratable polymer which is capable of gelling in the presence of borate ions. The complexor is prepared by mixing a cross-linking additive capable of furnishing borate ions in solution with a delay additive. The delay additive is effective, within a selected pH range, to chemically bond with both boric acid and the borate ions produced by the cross-linking additive to thereby limit the number of borate ions initially available in solution for subsequent cross-linking of the hydratable polysaccharide. The subsequent rate of cross-linking of the polysaccharide can be controlled by adjusting the pH of the complexor solution.

REFERENCES:
patent: 2879268 (1959-03-01), Jullander
patent: 3898165 (1975-08-01), Ely et al.
patent: 3960736 (1976-06-01), Free et al.
patent: 4040967 (1977-08-01), Nimerick
patent: 4974077 (1976-08-01), Free
patent: 5082579 (1992-01-01), Dawson

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