Improved fracturing fluid and method of use

C - Chemistry – Metallurgy – 09 – K

Patent

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C09K 8/68 (2006.01) E21B 43/26 (2006.01) E21B 43/267 (2006.01)

Patent

CA 2540988

Improved aqueous fracturing fluids are disclosed that are useful to fracture tight (low permeability) subterranean formations. Gas wells treated with these fracturing fluids have rapid cleanup and enhanced production. The fluids contain small but sufficient amounts of certain amine oxides to aid in the removal of fracturing fluid from the formation. By facilitating the removal of fluid from invaded zones, the damage to fracture faces in the formation is minimized. The amine oxides correspond to formula I, wherein R1 is an aliphatic group of from 6 to about 20 carbon atoms, and R2 and R3 are each independently alkyl of from 1 to about 4 carbon atoms. The amine oxides in which R1 is an alkyl group are preferred, and those in which R1 is an alkyl group of from 8 to 10 carbon atoms and R2 and R3 are each methyl or ethyl groups are most preferred.

L'invention concerne des liquides de fracturation aqueux améliorés qui permettent de fracturer des formations souterraines étroites (à basse perméabilité). Des puits de gaz traités au moyen de ces liquides de fracturation présentent des propriétés d'épuration rapides et une meilleure production. Ces liquides contiennent des quantités réduites mais suffisantes de certains oxydes d'amine afin de faciliter l'élimination du liquide de fracturation de la formation. En facilitant l'élimination du liquide des zones envahies, les dommages aux faciès de fracture pratiqués dans la formation sont minimisés. Les oxydes d'amine correspondent à la formule I, dans laquelle R¿1? représente un groupe aliphatique comprenant entre environ 6 et environ 20 atomes de carbone et R2 et R3 représentent chacun indépendamment alkyle compris entre environ 1 et environ 4 atomes de carbone. Les oxydes d'amine dans lesquels R¿1? représente un groupe alkyle sont préférables et les oxydes d'amine dans lesquels R¿1? représente un groupe alkyle comprenant entre environ 8 et 10 atomes de carbone et R¿2? et R¿3? représentent chacun des groupes méthyle ou éthyle sont idéaux.?¿

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