The method of claim 21, wherein the viscoelastic surfactant is selected from the group consisting of:(a) an amine having the formula ##STR20## (b) an amine salt having the formula ##STR21## and (c) a quaternary ammonium salt having the formula ##STR22## wherein R1 is an aliphatic group having at least 16 carbon atoms which may be branched or straight chained and which may be saturated or unsaturat