Carboxyalkyl substituted polygalactomannan fracturing fluids

Details Carboxyalkyl substituted polygalactomannan fracturing fluids Carboxyalkyl substituted polygalactomannan fracturing fluids

E - Fixed Constructions

21

B

E21B 43/26 (2006.01) C08B 37/00 (2006.01) C08L 5/14 (2006.01) C09K 8/68 (2006.01)

Patent

CA 2219212

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°F is provided.

Nouvelle composition d'un fluide de fracturation constitué de: 1) un polygalactomannane dérivé par carboxyalkyle présentant un degré de substitution compris entre environ 0,01 et environ 3,0; 2) un agent de réticulation sous la forme d'un sel de zirconium; 3) un ou plusieurs agents de stabilisation thermique, 4) un ou plusieurs tampons; et 5) de l'eau; ledit fluide étant capable de maintenir au moins 10 pour cent de sa viscosité de réticulation initiale après trois heures à une température supérieure ou égale à 250 DEG F.

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