Akzo Nobel N.v.

Douglas M Lucas

Michael D Hoey

Stanley B Mirviss

Ralph Franklin

James F Gadberry

Robert F Farmer

Maurice O Dery

Andress K Doyle

Glenda Del Carmen Vale

Randy E Dobson

Michael Engel

John P Bell

William John Parr

Ramanair S Premachandran

James F Gadberyy

A method for controlling the rheology of aqueous systems, particularly for those intended for underground use, includes injecting an aqueous viscoelastic fluid containing a surfactant gelling agent into the system. The viscoelastic surfactant composition of the invention comprises, as a gelling agent, at least one fatty aliphatic amidoamine oxide in a glycol solvent. The composition also maintains the levels of free fatty acid and free amine within critical parameters in order to achieve superior performance. The additives may be incorporated in the viscoelastic fluid to tailor its use in stimulation fluids, drilling muds, fracture fluids, and in applications such as permeability modification, gravel packing, cementing, and the like.

Viscoelastic surfactants and compositions containing same

Biocidal preservatives for use especially in preventing rotting and deterioration of wood include quaternary ammonium compounds which preferably have a fatty aliphatic substituent on the quaternary nitrogen atom. Especially preferred are cocoalkyl substituents. Other substituents can include alkoxy groups, arenes, and heterocyclic groups with or without ring substitutions, for example. The quaternary ammonium compound can also contain an amine nitrogen and can be complexed with copper.

Biocidal preservatives

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West Hempstead, NY, United States of America

Douglas M Lucas