Stepan Company

M-i Drilling Fluids UK Limited

Stepan UK Limited

Mathieu Pepin

Neil Grainger

Elodie Shaw

José Santiago

Alyn Jenkins

Laure Canal

Alla Crabtree

Michael Blezard

Milan Bartos

Maxime Feche

Jose Santiago

A method for inhibiting corrosion of pipelines and other metal surfaces, particularly those used in the oil-and-gas industry, is disclosed. The method comprises treating a brine-exposed metal surface with a film-forming composition. The composition comprises a quaternary surfactant, which is made by reacting a polyalkylene glycol (PAG), a haloalkanoic acid, and a tertiary fatty amine that optionally incorporates amide or ester functionality. The surfactant comprises a PAG monoester quat and a PAG diester diquat and may have other components. The quaternary surfactants provide good corrosion protection and can partition effectively from an oily phase into a brine phase in the absence of agitation. The surfactants are easy to synthesize economically and have structures that can be tailored to meet local HLB requirements.

Corrosion-inhibiting surfactants

The present invention relates to a corrosion inhibitor for use in the oil and gas exploration, recovery and processing industries. In particular, the invention relates to a quaternary ammonium compound suitable for use as such a corrosion inhibitor, to the manufacture of the quaternary ammonium compound, to compositions containing it, and to methods of using it. Quaternary ammonium compounds of the invention have the formula (I) in which R is Calkyl, Calkenyl, aryl, aralkyl; X, Y, and Z are each independently hydrogen, or R1CO&#x2014;, provided that at least one of X, Y and Z is R1CO, where R1 is Calkyl or alkenyl containing 0, 1, 2 or 3 double bonds; D is Calkylene; E is Calkylene; p, q and r are each, independently, integers from 0 to 20, with the proviso that p+q+r is from 3 to 20; and Ais an anion. 

Quaternary ammonium corrosion inhibitor

Growing community of inventors

Grenoble, France

Mathieu Pepin