Stabilizing crosslinked polymer guars and modified guar...

C - Chemistry – Metallurgy – 09 – K

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C09K 8/68 (2006.01) C09K 8/08 (2006.01) C09K 8/514 (2006.01) C09K 8/575 (2006.01) C09K 8/60 (2006.01) C09K 8/74 (2006.01)

Patent

CA 2576157

An aqueous, viscoelastic treating fluid gelled with a crosslinked guar or guar derivative is stabilized and improved with an effective amount of a glycol, such as ethylene glycol. These fluids are more stable in that viscosity is maintained, particularly at elevated temperatures. The additives may also increase viscosity to the point where less of a crosslinked guar or guar derivative gelling agent is required to maintain a given viscosity. These stabilized, enhanced, aqueous, viscoelastic fluids may be used as treatment fluids for subterranean hydrocarbon formations, such as in hydraulic fracturing.

Un fluide de traitement aqueux viscoélastique gélifié au moyen de guar réticulé ou de dérivé de guar est stabilisé et amélioré à l'aide d'une quantité efficace de glycol, tel que l'éthylène glycol. Ces fluides sont plus stables du fait que leur viscosité est préservée, particulièrement à températures élevées. Les additifs peuvent également augmenter la viscosité à tel point qu'une moindre quantité d'agent de gélification de guar réticulé ou de dérivé de guar est utilisée pour maintenir une viscosité donnée. Ces fluides stabilisés, améliorés, aqueux et viscoélastiques peuvent servir de fluides de traitement pour les formations d'hydrocarbures souterraines, notamment dans la fracturation hydraulique.

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