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.

Abstract: Treatment fluids employing stabilized heteropolysaccharide-based gels in brines are used as part of gravel packing and combined gravel packing-fracturing operations; a method includes providing a treatment fluid which includes an aqueous brine base, a heteropolysaccharide including one selected from the group consisting of diutan, scleroglucan, and succinoglycan, and a protein present in an amount sufficient to stabilize the heteropolysaccharide and hence minimizing the salting out phenomenon, the method including placing the treatment fluid in a subterranean formation.

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.

Abstract: Fluids with high carrying capacity for particulates in high pressure environments that may also be high temperature environments may include a viscosified base fluid having a density of about 14 ppg to about 20 ppg and comprises an aqueous fluid, a salt, a gelling agent, and an oxygen scavenger. Such fluids may be utilized in methods that involve providing a sand control screen assembly disposed within a wellbore penetrating a subterranean formation; and forming a gravel pack proximal to the sand control screen assembly with a treatment fluid, wherein the treatment fluid comprises the viscosified base fluid and a plurality of particulates.

Abstract: Treatment fluids employing stabilized heteropolysaccharide-based gels in brines are used as part of gravel packing and combined gravel packing-fracturing operations; a method includes providing a treatment fluid which includes an aqueous brine base, a heteropolysaccharide including one selected from the group consisting of diutan, scleroglucan, and succinoglycan, and a protein present in an amount sufficient to stabilize the heteropolysaccharide and hence minimizing the salting out phenomenon, the method including placing the treatment fluid in a subterranean formation.