Method for improving the high temperature gel stability of borat

Details Method for improving the high temperature gel stability of borat Method for improving the high temperature gel stability of borat

1991-04-08

1992-09-08

Maples, John S.

Compositions

Leather or fur treating

2523153, 166308, E21B 4326

Patent

active

051455900

ABSTRACT:
A complexor solution and method of use are shown for providing controlled delay and improved high temperature gel stability of borated fracturing fluids. 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. In addition to providing more precise control of the delay time, the complexor provides a reserve of borate which provides improved gel stability at higher temperatures.

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