Method and means for gelled acidizing of porous subterranean formations

摘要

Gelled acidic compositions suitable for either matrix-acidizing or fracture-acidizing of subterranean formations comprising water, a water-dispersible polymer selected from cellulose ethers and polymers of acrylamides, an acid, an aldehyde, and a phenolic compound capable of causing gelation of an aqueous dispersion of the polymer, acid, aldehyde, and phenolic compound are provided. In another embodiment, guar gum, polyvinylpyrrolidone and biopolysaccharides can also be used as the polymeric component in said compositions.