US 7,601,675 B2
	Polyamine salts as clay stabilizing agents
David J. Poelker, Missouri City, Tex. (US); JoAnn McMahon, Arnold, Mo. (US); and John A. Schield, Missouri City, Tex. (US)
Assigned to Baker Hughes Incorporated, Houston, Tex. (US)
Filed on Oct. 16, 2007, as Appl. No. 11/872,828.
Application 11/872828 is a division of application No. 11/010759, filed on Dec. 13, 2004, granted, now 7,284,610.
Claims priority of provisional application 60/529992, filed on Dec. 16, 2003.
Prior Publication US 2008/0108523 A1, May 08, 2008
This patent is subject to a terminal disclaimer.
Int. Cl. B01F 17/00 (2006.01); C08F 20/00 (2006.01)

U.S. Cl. 507—229  [525/330.3]

11 Claims

1. A composition comprising a polyamine salt of an imide of a polymer of maleic anhydride selected from the group consisting of homopolymers of maleic anhydride and copolymers of maleic anhydride containing repeating units at least 92% of which are maleic anhydride, where the polyamine salt is at least partially neutralized with an acid selected from the group consisting of glycolic acid, methanesulfonic acid, sulfurous acid, and mixtures thereof.