Composition for acidizing subterranean formations

摘要: Gelled acidic compositions suitable for either matrix-acidizing or fracture-acidizing of subterranean formations, and methods using said in acidizing operations, are provided. Said comprise water, a water-dispersible biopolysaccharide, an acid, water-soluble compound polyvalent metal wherein the can be reduced to lower valence state cause gelation water containing biopolysaccharide reducing agent capable causing gelation.