THE USE OF ENCAPSULATED ACID IN ACID FRACTURING TREATMENTS

摘要

A method of fracturing a subterranean formation, in which subterranean formation being in fluid communication with the surface includes creating a fracture in the subterranean formation, the fracture having more than one fracture faces; and injecting into the fracture an encapsulated formation etching agent, wherein the encapsulated formation etching agent includes a formation etching agent and an encapsulating agent and wherein the formation etching agent etches the fracture faces of the fracture so as to form a flow channel in the formation. The formation etching agent may be selected from mineral acids and mixtures thereof, organic acids and mixtures thereof, mineral acids and mixtures of mineral acids mixed with gelling agent, organic acids and mixtures of organic acids mixed with gelling agent, water soluble hydroxides and mixtures of water soluble hydroxides, and water soluble hydroxides and mixtures of water soluble hydroxides mixed with gelling agent. The encapsulating agent may be a natural and synthetic oils, natural and synthetic polymers and enteric polymers and mixtures thereof.