Carboxyalkyl substituted polygalactomannan fracturing fluids
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United States of America Patent
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Dec 16, 1997
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app pub date -
Feb 26, 1997
filing date -
Apr 25, 1995
priority date (Note) -
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Abstract
A novel fracturing fluid composition comprising: (1) a carboxyalkyl derivatized polygalactomannan having a degree of substitution of between about 0.01 and about 3.0; (2) a zirconium salt crosslinking agent; (3) one or more thermal stabilizing agents; (4) one or more pH buffers; and (5) water; wherein said fluid is capable of maintaining at least 10 percent of its original cross-linked viscosity after three hours at a temperature greater to or equal to 250.degree. F. is provided.
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