Viscosity reduction of viscoelastic surfactant based fluids

E - Fixed Constructions – 21 – B

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Details

E21B 43/25 (2006.01) C09K 8/52 (2006.01) C09K 8/68 (2006.01)

Patent

CA 2492317

Methods and compositions are disclosed for controlled addition of components that decrease the viscosity of the viscoelastic surfactant fluids or for controlled changes in the electrolyte concentration or composition of the viscoelastic surfactant fluids. One aspect of the invention relates to the use of internal breakers with a delayed activation. Another aspect of the invention relates to the use of precursors that release a breaking system such as alcohol by a process such as melting, slow dissolution, reaction with a compound present in the fluid or added to the fluid during or after the step of injecting, rupture of an encapsulating coating and de-adsorption of a breaking agent absorbed into solid particles. In another aspect of the invention, alcohols are included in a pad to reduce the low-shear viscosity and reduce the resistance to flow of the treatment fluids during a desired phase of the treatment.

L'invention concerne des procédés et des compositions utilisés dans l'addition contrôlée de composants destinés à réduire la viscosité des fluides à agents de surface viscoélastiques, ou les changements contrôlés de la concentration électrolytique ou la composition des fluides à agents de surface viscoélastiques. Un aspect de l'invention concerne l'utilisation d'agents de fragmentation internes à activation retardée. Un autre aspect de l'invention concerne l'utilisation de précurseurs libérant un système de fragmentation, par exemple un alcool, par un procédé tel que la fusion, la dissolution lente, la réaction avec un composé présent dans le fluide ou ajouté au fluide au cours de ou après l'étape d'injection, la rupture d'un revêtement d'encapsulation, et la désabsorption d'un agent de fragmentation absorbé dans des particules solides. Dans un autre aspect de l'invention, les alcools sont inclus dans un tampon afin de réduire la viscosité à faible cisaillement, et réduire la résistance à l'écoulement des fluides de traitement au cours d'une phase désirée du traitement.

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