Viscoelastic surfactant fluids and associated acidizing methods

Details Viscoelastic surfactant fluids and associated acidizing methods Viscoelastic surfactant fluids and associated acidizing methods

C - Chemistry, Metallurgy

09

K

C09K 8/74 (2006.01) B01F 17/00 (2006.01) C09K 8/52 (2006.01) C09K 8/584 (2006.01) C09K 8/66 (2006.01) E21B 43/27 (2006.01)

Patent

CA 2598073

Provided are treatment fluids that comprise an aqueous base fluid, an acid, and a methyl ester sulfonate surfactant, and associated methods of use. In one embodiment, the present invention provides a method of acidizing a subterranean formation comprising: providing a treatment fluid comprising an aqueous base fluid, an acid, and a methyl ester sulfonate surfactant; introducing the treatment fluid into a well bore that penetrates the subterranean formation; and allowing at least a portion of the treatment fluid to react with at least a portion of the subterranean formation so that at least one void is formed in the subterranean formation. In some instances, the treatment fluids exhibit viscoelastic behavior which may be due, at least in part, to the association of at least a portion of the methyl ester sulfonate surfactant into a plurality of micellar structures.

L'invention concerne des fluides de traitement comprenant un fluide à base aqueuse, un acide et un tensioactif à base de méthyl-ester-sulfonate, ainsi que des méthodes d'utilisation associées. Un mode de réalisation concerne un procédé d'acidification d'une formation souterraine, ce procédé consistant à préparer un fluide de traitement comprenant un fluide à base aqueuse, un acide et un tensioactif à base de méthyl-ester-sulfonate, introduire ce fluide de traitement dans un puits de forage qui traverse la formation souterraine et faire réagir au moins une partie du fluide de traitement avec au moins une partie de la formation souterraine de sorte qu'au moins un vide soit formé dans ladite formation. Dans certains exemples, les fluides de traitement présentent un comportement viscoélastique pouvant être dû, au moins en partie, à l'association d'au moins une partie du tensioactif à base de méthyl-ester-sulfonate sous la forme d'une pluralité de structures micellaires.

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