Abstract: A subterranean treatment fluid may include an invert emulsion including a clarified diutan-based gelled aqueous internal phase and a mineral oil-based external phase, and an acid composition. The acid composition may include at least one acid selected: formic acid, acetic acid, propionic acid, lactic acid, glycolic acid, and combinations thereof, at least one acid-generating compound selected from: an ester; an aliphatic polyester; an ortho ester; a poly(ortho ester); an ortho ether; a poly(ortho ether); a lactide; a poly(lactide); a glycolide; a poly(glycolide); an ?-caprolactone; a poly(?-caprolactone); a hydroxybutyrate; a poly(hydroxybutyrate); an anhydride; a poly(anhydride); an aliphatic carbonate; an aliphatic polycarbonate; an amino acid; a poly(amino acid), and combinations thereof, or a combination of the at least one acid and the at least one acid-generating compound. The subterranean treatment fluid may have a density less than water.