Calgon Corporation

Christine A Costello

Gary F Matz

Shih-Ruey Tom Chen

Nancy S Sherwood

The instant invention is directed to a polymer, having an intrinsic viscosity of 1.0 to 7.0, preferably 1.5 to 5.0, dl/g in 1.0 M NaCl, prepared from:

Polymers for use as filtration control aids in drilling muds

The instant invention is directed to a polymer, having an intrinsic viscosity of 1.0 to 7.0, preferably 1.5 to 5.0, dl/g in 1.0M NaCl, prepared from:

The instant invention is directed to a polyampholyte polymer, having an intrinsic viscosity of 0.05 to 4.5 dl/g in 1.0 M NaCl, prepared from 32.5 to 90 percent acrylic acid and/or methacrylic acid, 1.5 to 65 percent, by weight, of acrylamide and 0.5 to 25 percent, by weight, of dimethyldiallyl ammonium chloride and/or diethyldiallyl ammonium chloride.

Polyampholyte polymer

The instant invention is directed to a method of recovering oil and/or gas from a subterranean formation which is penetrated by a well bore, and for reducing the concomitant production of reservoir water therefrom comprising injecting into said formation through said well bore an aqueous treating solution or emulsion containing a polyampholyte prepared from:

Use of polyampholytes to enhance oil and/or gas recovery

The instant invention is directed to a method of inhibiting the precipitation and deposition of scale in an aqueous system comprising adding an effective amount, preferably at least 0.1 ppm, of a carboxylic functional polyampholyte, or the salt thereof, to said aqueous system.

Use of a carboxylic functional polyampholyte to inhibit the

The instant invention is directed to an aqueous drilling fluid comprising an aqueous clay dispersion and a carboxylic functional polyampholyte, or the salt thereof. The instant invention is also directed to the use of the drilling fluid.

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Coraopolis, PA, United States of America

Christine A Costello