Phillips Petroleum Company

Chester C Johnston, Jr

James E Hessert

Brent J Bertus

Excessive water production from a producing gas well is substantially reduced by the injection of a hydrocarbon-diluted water-in-oil emulsion comprising a viscosifying polymer such as polyacrylamide, the injected emulsified polymer swelling on contact with connate water in the subsurface gas producing formation to restrict transfer of water therethrough toward the producing gas well.

Treatment of subsurface gas-bearing formations to reduce water

Gelled acidic compositions suitable for either matrix-acidizing or fracture-acidizing of subterranean formations, and methods of using said compositions in acidizing operation, 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.

Composition for acidizing subterranean formations

Aqueous gelable compositions comprising water, a polymer, a polyvalent metal compound wherein the metal can be reduced to a lower polyvalent valence state, a reducing agent, and a complexing agent for complexing with newly reduced ions of said metal and increasing the gelation time of said compositions; and methods of preparing said compositions.

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Bartlesville, OK, United States of America

Chester C Johnston, Jr