Charles W Williamson

US Patent:

51479648, Sep 15, 1992

Filed:

Apr 23, 1991

Appl. No.:

7/690044

Inventors:

David A. Huddleston - Sugar Land TX
Robert K. Gabel - Houston TX
Charles D. Williamson - Sugar Land TX

Assignee:

Nalco Chemical Company - Naperville IL

International Classification:

C08H 502

US Classification:

527400

Abstract:

A process for forming an oil well cement composition comprising: mixing cement and a vinyl grafted wattle tannin fluid loss additive, the vinyl grafted wattle tannin comprising a wattle tannin grafted with at least one vinyl monomer selected from the group consisting of: 2-acrylamido-2-methylpropanesulfonic acid and acrylamide, wherein the wattle tannin is present in an amount of between about 0. 05 to about 14 weight percent based on actives, the 2-acrylamido-2-methylpropanesulfonic acid is present in an amount of between about 68 to about 99. 95 percent, and acrylamide is present in an amount of between about 0 to about 18 percent, to form a cement blend; and mixing the cement blend with water.

US Patent:

50092677, Apr 23, 1991

Filed:

Sep 7, 1990

Appl. No.:

7/578883

Inventors:

Charles D. Williamson - Houston TX
Stephan J. Allenson - Richmond TX
Robert K. Gabel - Houston TX

Assignee:

Nalco Chemical Company - Naperville IL

International Classification:

E21B 4327

US Classification:

166271

Abstract:

A fluid loss control additive for aqueous fracturing media including a blend of two or more modified starches or a blend of one or more natural starches with one or more modified starches.

US Patent:

51342154, Jul 28, 1992

Filed:

Oct 15, 1990

Appl. No.:

7/598059

Inventors:

David A. Huddleston - Sugar Land TX
Robert K. Gabel - Houston TX
Charles D. Williamson - Sugar Land TX

Assignee:

Nalco Chemical Company - Naperville IL

International Classification:

C08H 504

US Classification:

527400

Abstract:

A process for forming an oil well cement composition comprising: mixing cement and a vinyl grafted wattle tannin fluid loss additive, the vinyl grafted wattle tannin comprising a wattle tannin grafted with at least one vinyl monomer selected from the group consisting of: 2-acrylamido-2-methylpropanesulfonic acid and acrylamide, wherein the wattel tannin is present in an amount of between about 2 to about 14 weight percent based on actives, the 2-acrylamido-2-methylpropanesulfonic acid is present in an amount of between about 84 to about 98 percent, and acrylamide is present in an amount of between about 0 to about 4 percent, to form a cement blend; and mixing the cement blend with water.

US Patent:

50322974, Jul 16, 1991

Filed:

May 19, 1989

Appl. No.:

7/354042

Inventors:

Charles D. Williamson - Sugar Land TX
Stephan J. Allenson - Richmond TX
Robert K. Gabel - Houston TX
David A. Huddleston - Sugar Land TX

Assignee:

Nalco Chemical Company - Naperville IL

International Classification:

C09K 702

US Classification:

252 8551

Abstract:

In treating oil well down hole bores, a method of treating subterranean formations by fracturing by utilization of a fluid loss additive (FLA) comprising starch or a mixture of natural and modified starches plus an enzyme which degrades the alpha linkage of starch and does not the degrade the beta linkage of guar and modified guar where used as a viscosity modifier. Natural/modified starches are utilized in a preferred ratio of 3:7 to 7:3 or 1:9 to 9:1 with optimum at 1:1, and the mix is used in the dry form for application from the surface down the bore hole.

US Patent:

49975811, Mar 5, 1991

Filed:

Nov 14, 1988

Appl. No.:

7/272237

Inventors:

Charles D. Williamson - Houston TX
Stephan J. Allenson - Richmond TX
Robert K. Gabel - Houston TX

Assignee:

Nalco Chemical Company - Naperville IL

International Classification:

E21B 4300

US Classification:

252 8551

Abstract:

A fluid loss control additive for aqueous fracturing media including a blend of two or more modified starches or a blend of one or more natural starches with one or more modified starches.

US Patent:

46785914, Jul 7, 1987

Filed:

Apr 7, 1986

Appl. No.:

6/848527

Inventors:

David M. Giddings - Sugar Land TX
Charles D. Williamson - Houston TX

Assignee:

Nalco Chemical Company - Oak Brook IL

International Classification:

C09K 702

US Classification:

252 8514

Abstract:

A method of improving high temperature fluid loss and rheology stabilization of high calcium brine clay-containing oil well drilling fluids which comprises adding thereto a stabilizing amount of a water-soluble terpolymer composition comprising: ______________________________________ Ingredients % by weight ______________________________________ NaAMPS 72-3. 8 N,N--dimethylacrylamide 13. 5-0. 7 Acrylonitrile 9. 5-0. 5 ______________________________________ said composition containing lignin, modified lignin, brown coal or modified brown coal in an amount ranging between 5-95% with the lignin, modified lignin, brown coal or modified brown coal having been present during the polymerization of the water-soluble polymer.

US Patent:

RE338567, Mar 24, 1992

Filed:

Jan 15, 1988

Appl. No.:

7/144260

Inventors:

David M. Giddings - Sugar Land TX
Charles D. Williamson - Houston TX

Assignee:

Nalco Chemical Company - Naperville IL

International Classification:

C09K 702

US Classification:

507106

Abstract:

A method of improving high temperature fluid loss and rheology stabilization of high calcium brine clay-containing oil well drilling fluids which comprises adding thereto a stabilizing amount of a water-soluble terpolymer composition comprising: ______________________________________ Ingredients % by weight ______________________________________ NaAMPS 72-3. 8 N,N-dimethylacrylamide 13. 5-0. 7 Acrylonitrile 9. 5-0. 5 ______________________________________ said composition containing lignin, modified lignin, brown coal or modified brown coal in an amount ranging between 5-95% with the lignin, modified lignin, brown cell or modified brown coal having been present during the polymerization of the water-soluble polymer.

US Patent:

50282719, Jul 2, 1991

Filed:

Feb 5, 1990

Appl. No.:

7/475386

Inventors:

David A. Huddleston - Sugar Land TX
Charles D. Williamson - Sugar Land TX

Assignee:

Nalco Chemical Company - Naperville IL

International Classification:

C04B 2434

US Classification:

106720

Abstract:

A vinyl grafted lignite fluid loss additive comprising a lignite grafted with at least one vinyl monomer selected from the group consisting of: dimethylaminopropyl methacrylamide, methacrylamido propyltrimethyl ammonium chloride, N-vinylformamide, N-vinylacetamide, diallyl dimethyl ammonium chloride, diallylacetamide, and diallylamine. The vinyl monomer may also be blended with at least one co-monomer. Preferred co-monomers are: 2-acrylamido-2-methylpropanesulfonic acid, dimethylacrylamide, acrylamide, vinylpyrrolidone, vinylacetate, acrylonitrile, dimethylaminoethyl methacrylate, styrenesulfonate, vinylsulfonate, dimethylaminoethyl methacrylate methyl chloride quaternary, acrylic acid and its salts.