Viscoelastic surfactant rheology modification

Details Viscoelastic surfactant rheology modification Viscoelastic surfactant rheology modification

C - Chemistry, Metallurgy

09

K

C09K 8/62 (2006.01) C09K 8/80 (2006.01) E21B 43/26 (2006.01) E21B 43/267 (2006.01)

Patent

CA 2629918

Methods for treating a subterranean formation penetrated by a wellbore where shear recovery time of viscoelastic surfactant treatment fluids is shorten by adding an effective amount of an fiber based rheology enhancer. The rheology enhancer also increases fluid viscosity. Further, the rheology enhancer also improves proppant settling. Some examples of surfactants are betaines and quaternary amines, and an example of fiber based rheology enhancer is polylactic acid fiber. The fluids are useful in oilfield treatments, as well as methods of preparing viscoelastic surfactant based fluids.

La présente invention concerne des procédés pour traiter une formation souterraine pénétrée par un sondage où un temps de restitution de cisaillement de fluides de traitement d~agent de surface viscoélastique est raccourci en ajoutant une quantité efficace d~un amplificateur rhéologique à base de fibre. L~amplificateur rhéologique augmente également la viscosité de fluide. En outre, l~amplificateur rhéologique optimise la sédimentation d~agent de soutènement. Des exemples d~agents de surface sont les bétaïnes et amines quaternaires, et un exemple d~amplificateur rhéologique à base de fibre est la fibre d~acide polylactique. Les fluides sont utiles dans des traitements de champ pétrolifère ainsi que des procédés de préparation de fluides à base d~agent de surface viscoélastique.

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