Phillips Petroleum Company

Chester C Johnston

Brent J Bertus

James E Hessert

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

Method for acidizing subterranean formations

A method for altering the permeability of a subterranean formation in which aqueous polymer solution and encapsulated reacting agent is passed into the formation with subsequent release of reacting agent in response to formation conditions causing a reaction that thickens the polymer solution.

Growing community of inventors

Dewey, OK, United States of America

Chester C Johnston