Patent ID: 6722434
Filing Date: 2004-04-20
Classification: C04B,C09K,Y10S

Abstract:
An improved method of generating gas in and foaming an alkaline well treating fluid introduced into a subterranean zone penetrated by a well bore comprising the steps of:(a) combining one or more gas generating chemicals with said well treating fluid; (b) combining one or more delayed encapsulated activators having selected release times with said well treating fluid containing said gas generating chemicals formed in step (a) so that said gas generating chemicals react with said one or more delayed encapsulated activators and gas and foam are formed in said treating fluid while said treating fluid is being pumped or at one or more times after said treating fluid has been placed in said subterranean zone, or both; and (c) pumping said treating fluid formed in step (b) into said well bore and into said subterranean zone.