Method and composition of preparing polymeric fracturing fluids

E - Fixed Constructions – 21 – B

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E21B 43/26 (2006.01) C09K 8/68 (2006.01)

Patent

CA 2628471

In the presence of certain polyols, a guar gum or similar polysaccharide thickener solution is boron crosslinked before achievement of complete hydration of the thickener, without compromising the viscosity level achieved in a fracturing fluid by the time it is pumped into the wellbore and fractures the subterranean formation adjacent the wellbore. Methods continuously involve hydrating a polysaccharide thickener to an extent of 10% to 75%, but less than full hydration. Before 75% hydration is exceeded, a boron crosslinker is added. Upon addition of the boron crosslinker, the fluid is injected into the wellbore to stimulate hydrocarbon production. Because less time is needed for hydration, well site mixing equipment is down-sized smaller to achieve better efficiency and cost savings.

Selon l'invention, en présence de certains polyols, une gomme de guar ou toute autre solution d'épaississeur de polysaccharide similaire est réticulée par du bore avant la fin d'une hydradation complète de l'épaississeur, sans compromettre le taux de viscosité dans le fluide de fracturation, lorsqu'il est pompé à l'intérieur du puits et fracture la formation souterraine adjacente au puits. L'invention concerne des procédés comprenant l'hydratation, comprise entre 10 et 75 %, d'un épaississeur de polysaccharide, l'hydratation n'étant pas complète. Avant que le taux de 75 % d'hydratation soit atteint, un agent de réticulation contenant du bore est introduit. Lors de l'ajout de l'agent de réticulation, le fluide est injecté dans le puits pour stimuler la production d'hydrocarbures. Une courte période est nécessaire pour l'hydratation, l'équipement de mélange du site de forage est de taille réduite, ce qui le rend plus efficace et permet de réduire les coûts.

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