Method for removing filter cake from a horizontal wellbore using acid foam

A method for removing a filter cake from a horizontal wellbore in a subterranean formation, the method comprising:

• a) forming a stable aqueous acidic foam, the foam being stable at 200° F. for at least about 3 to about 4 hours and comprising:
• i) an aqueous 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;
• ii) about 0.05 to about 3 weight percent of a cationic fluorocarbon surfactant;
• iii) about 0.1 to about 4 weight percent of an alkyl alcohol containing from about 4 to about 8 carbon atoms;
• iii) at least one 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;
• iv) water optionally containing ammonium chloride;
• b) positioning the aqueous acidic foam in the horizontal wellbore;
• and,
• c) retaining the aqueous acidic foam in the horizontal wellbore for a time from about 2 to about 4 hours.