Additive for viscoelastic fluid

Details Additive for viscoelastic fluid Additive for viscoelastic fluid

C - Chemistry, Metallurgy

09

K

C09K 8/68 (2006.01) C09K 8/506 (2006.01) C09K 8/575 (2006.01)

Patent

CA 2553020

Composition and method for shortening the shear recovery time of cationic, zwitterionic, and amphoteric viscoelastic surfactant fluid systems by adding an effective amount of a co-gelling agent selected from triblock oligomeric compounds having hydrophilic (for example polyether) and hydrophobic (for example alkyl) portions. The co-gelling agent also increases fluid viscosity and very low co-gelling agent concentration is needed. Preferred surfactants are betaines and quaternary amines. The fluids are useful in oilfield treatments, for example fracturing and gravel packing.

Composition et procédé permettant de réduire la durée de récupération au cisaillement des systèmes fluides tensioactifs visco-élastiques amphotères, zwitterioniques et cationiques par adjonction d'une quantité efficace d'un agent co-gélifiant choisi parmi les composés oligomères triséquencés à parties hydrophiles (par exemple polyéther) et hydrophobes (par exemple alkyle). L'agent co-gélifiant permet également d'augmenter la viscosité du fluide et il suffit d'une très faible concentration d'agent co-gélifiant. Les tensioactifs préférés sont les bétaïnes et les amines quaternaires. Ces fluides sont utilisables dans le domaine des puits de pétrole un et notamment pour la fracturation et le gravillonnage.

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