Method for stabilizing an acrylamide polymer in a petroleum recovery process
AssigneeNitto Chemical Industry Co., Ltd.
InventorsShoichi Kanda, Gengiro Kawamura
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Abstract
2-Mercaptobenzoimidazole or its water-soluble salt is added to a water-soluble acrylamide polymer containing a predominant amount of acrylamide in the molecule to inhibit degradation, especially at high temperatures, in a petroleum recovery process.
Claims1
An aqueous solution of an acrylamide polymer stabilized for use in a petroleum recovery process comprising a partially hydrolyzed polyacrylamide, water, and a stabilizing effective amount of 2-mercaptobenzoimidazole or a water-soluble salt thereof having the general formula ##STR2## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 each represents a hydrogen atom or a lower alkyl group, and X represents a hydrogen atom, an alkali metal atom or an ammonium group.
Dependencies are inferred from the claim text.