John Stanley Rhudy
Engineers at Ogden, Littleton, CO

4397748, Aug 9, 1983

Nov 12, 1981

6/320447

Perry A. Argabright - Larkspur CO
John S. Rhudy - Littleton CO

Marathon Oil Company - Findlay OH

C02F 154, F17D 117

210733

A method of reducing the fluid flow friction loss of fluid waste materials in the conduits of sanitary sewer systems while at the same time maintaining the solid materials in the fluid in a flowable condition by introducing into a sewer system about 1 to about 10,000 ppm of an aqueous solution of a partially hydrolyzed polyacrylamide polymer having a preselected average molecular weight and molecular weight distribution.

4687586, Aug 18, 1987

Dec 5, 1985

6/805977

Perry A. Argabright - Larkspur CO
John S. Rhudy - Littleton CO

Marathon Oil Company - Findlay OH

C09K 300

252 8551

An on-site, in-line process and system for recovering oil from oil-bearing subterranean formations which involves the production, modification, dilution and injection of a polymer solution, preferably consisting essentially of an aqueous solution of a partially hydrolyzed polyacrylamide, having injectivity and mobility properties capable of meeting the specific permeability requirements of substantially any subterranean formation to be achieved. The polymer solutions prepared by the process and system can be used as drive fluids for displacing oil (secondary polymer flood) in an oil-bearing formation, as mobility buffers to follow micellar dispersion floods in the conjoint presence of chemical reagents in other chemical floods (e. g. , surfactant, caustic, etc. ), or they can follow a water flood.

4580627, Apr 8, 1986

Sep 19, 1983

6/533112

Perry A. Argabright - Larkspur CO
John S. Rhudy - Littleton CO

Marathon Oil Company - Findlay OH

E21B 4322

166 79

An on-site, in-line process and system for recovering oil from oil-bearing subterranean formations which involves the production, modification, dilution and injection of a polymer solution, preferably consisting essentially of an aqueous solution of a partially hydrolyzed polyacrylamide, having injectivity and mobility properties capable of meeting the specific permeability requirements of substantially any subterranean formation to be achieved. The polymer solutions prepared by the process and system can be used as drive fluids for displacing oil (secondary polymer flood) in an oil-bearing formation, as mobility buffers to follow micellar dispersion floods in the conjoint presence of chemical reagents in other chemical floods (e. g. , surfactant, caustic, etc. ), or they can follow a water flood.

RE32114, Apr 15, 1986

Jan 7, 1985

6/689346

Perry A. Argabright - Larkspur CO
John S. Rhudy - Littleton CO

Marathon Oil Company - Findlay OH

E21B 4322

166252

An on-site, in-line process and system for recovering oil from oil-bearing subterranean formations which involves the production, modification, dilution and injection of a polymer solution, preferably consisting essentially of an aqueous solution of a partially hydrolyzed polyacrylamide, having injectivity and mobility properties capable of meeting the specific permeability requirements of substantially any subterranean formation to be achieved. The polymer solutions prepared by the process and system can be used as drive fluids for displacing oil (secondary polymer flood) in an oil-bearing formation, as mobility buffers to follow micellar dispersion floods in the conjoint presence of chemical reagents in other chemical floods (e. g. , surfactant, caustic, etc. ), or they can follow a water flood.

4098337, Jul 4, 1978

Jul 1, 1977

5/812212

Perry A. Argabright - Larkspur CO
John S. Rhudy - Littleton CO
Brian L. Phillips - Littleton CO

Marathon Oil Company - Findlay OH

E21B 33138, E21B 4322

166270

Improved injectivity profiles and/or vertical conformance in flooding heterogeneous formations containing high permeability zones is obtained by injecting an aqueous polyacrylamide solution and an aqueous formaldehyde solution into the formation and allowing the polyacrylamide to react with the formaldehyde in the relatively high permeability zones to form a gel. Thereafter, improved sweep efficiency is realized in displacing hydrocarbon from the lesser permeability zones.

3937633, Feb 10, 1976

Nov 21, 1973

5/418158

Bruce L. Knight - Littleton CO
John S. Rhudy - Littleton CO
William B. Gogarty - Littleton CO

Hercules, Incorporated - Wilmington DE

C04B 702

106 90

Water loss from cement slurries is reduced by incorporating within a cement slurry a polymer obtained as a product of radiation-induced polymerization of acrylamide and/or methacrylamide and acrylic acid, methacrylic acid, and/or alkali metal salts thereof. The polymerization is preferably carried out in 10-60% aqueous monomer solution with gamma radiation. The aqueous monomer solution preferably contains 25-99% acrylamide and 75-1% sodium acrylate. The polymer can be present in concentration of about 0. 001 to about 3. 0 weight percent, based on the aqueous phase of the slurry.

4503909, Mar 12, 1985

Sep 16, 1983

6/532741

Perry A. Argabright - Larkspur CO
John S. Rhudy - Littleton CO

Marathon Oil Company - Findlay OH

E21B 4322, E21B 4900

166252

An on-site, in-line process and system for recovering oil from oil-bearing subterranean formations which involves the production, modification, dilution and injection of a polymer solution, preferably consisting essentially of an aqueous solution of a partially hydrolyzed polyacrylamide, having injectivity and mobility properties capable of meeting the specific permeability requirements of substantially any subterranean formation to be achieved. The polymer solutions prepared by the process and system can be used as drive fluids for displacing oil (secondary polymer flood) in an oil-bearing formation, as mobility buffers to follow micellar dispersion floods in the conjoint presence of chemical reagents in other chemical floods (e. g. , surfactant, caustic, etc. ), or they can follow a water flood.

4234433, Nov 18, 1980

Oct 4, 1978

5/948610

John S. Rhudy - Littleton CO
Connie L. Gibb - Evergreen CO

Marathon Oil Company - Findlay OH

E21B 4322

252 855D

Plugging of reservoirs with high molecular weight polymers, e. g. partially hydrolyzed polyacrylamide, is overcome by chemically treating a polymer having an excessively high average molecular weight prior to injection into a reservoir with an oxidizing chemical, e. g. sodium hypochlorite, and thereafter incorporating a reducing chemical, e. g. , sodium sulfite, to stop degradation of the polymer when a desired lower average molecular weight and flooding characteristics are attained.

4433727, Feb 28, 1984

Jun 19, 1981

6/275594

Perry A. Argabright - Larkspur CO
John S. Rhudy - Littleton CO

Marathon Oil Company - Findlay OH

E21B 4322

166252

An on-site, in-line process and system for recovering oil from oil-bearing subterranean formations which involves the production, modification, dilution and injection of a polymer solution, preferably consisting essentially of an aqueous solution of a partially hydrolyzed polyacrylamide, having injectivity and mobility properties capable of meeting the specific permeability requirements of substantially any subterranean formation to be achieved. The polymer solutions prepared by the process and system can be used as drive fluids for displacing oil (secondary polymer flood) in an oil-bearing formation, as mobility buffers to follow micellar dispersion floods in the conjoint presence of chemical reagents in other chemical floods (e. g. , surfactant, caustic, etc. ), or they can follow a water flood.

3938594, Feb 17, 1976

Apr 8, 1974

5/458740

John S. Rhudy - Littleton CO
Bruce L. Knight - Littleton CO

Marathon Oil Company - Findlay OH

E21B 4326

166308

Improved fracturing of subterranean formations with water-based fracturing fluids is obtained by incorporating into an aqueous fracturing fluid (1) a water-soluble, high molecular weight polymer that will crosslink in the presence of chromic ion and (2) controlled amounts of chromic ion to crosslink the polymer to form a gel of desired viscosity. Useful polymers include partially hydrolyzed polyacrylamide and copolymers of acrylamide and sodium acrylate.