Viscosity reduction of viscoelastic surfactant based fluids

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 43/25 (2006.01) C09K 8/536 (2006.01) C09K 8/62 (2006.01) C09K 8/74 (2006.01) C09K 8/92 (2006.01)

Patent

CA 2405256

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 pour l'addition contrôlée de composants qui diminuent la viscosité de fluides tensio-actifs visco-élastiques ou pour des modifications contrôlées de la concentration ou de la composition de l'électrolyte des fluides tensio-actifs visco-élastiques. Un aspect de l'invention concerne l'utilisation d'un agent de rupture interne à activation retardée. Un autre aspect de cette invention concerne l'utilisation de précurseurs qui déclenchent un système de rupture, tel que l'alcool, par un procédé comme la fusion, la dissolution lente, la réaction avec un composé présent dans le fluide ou ajouté au fluide durant ou après l'étape d'injection, la rupture d'une couche d'enrobage et la désadsorption d'un agent de rupture absorbé dans des particules solides. Selon un autre aspect de l'invention, les alcools sont compris dans un tampon pour réduire la viscosité sous une faible contrainte de cisaillement et réduire la résistance à l'écoulement des fluides de traitement durant une phase voulue du traitement.

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