Patent ID: 7514390
Filing Date: 2009-04-07
Classification: C09K

Abstract:
1. A composition for producing a stable acidic foam for use in removing filter cake from a horizontal wellbore in a subterranean formation, the foam being stable at 200° F. for at least about 3 to about 4 hours, the composition consisting essentially of: a) an acidic material selected from the group consisting of from about 1 to about 20 weight percent of an inorganic acid, from about 1 to about 30 weight percent of an organic acid and mixtures thereof; b) about 0.05 to about 3 weight percent of a cationic fluorocarbon co-surfactant; c) about 0.1 to about 4 weight percent of an alkyl alcohol containing from about 4 to about 8 carbon atoms; d) of about 0.1 to about 4 weight percent of a betaine surfactant and about 0.25 to about 10 weight percent of an alkyl polyglycoside containing alkyl groups containing from about 8 to about 16 carbon atoms and mixtures thereof and; e) water optionally containing ammonium chloride.