Patent ID: 9018145
Filing Date: 2015-04-28
Classification: C09K,E21B

Abstract:
1. An aqueous foaming composition for use in oil field applications comprising from about 8 to about 16 wt. % of a first anionic alcohol ether sulfate surfactant comprising short chain sodium or ammonium alcohol ether sulfate surfactants having between 2 and about 10 carbon atoms, from about 40 to about 60 wt. % of a second anionic alcohol ether sulfate surfactant comprising long chain sodium or ammonium alcohol ether sulfate surfactants having between about 10 to about 24 carbon atoms, and from about 15 wt. % to about 35 wt. % of at least one zwitterionic compounds, where the composition is biodegradable, is heat stable at a temperature of 280° F., has a near zero Zeta value, produces no residuals at temperatures up to 280° F. and is capable of being recycled.