Patent ID: 11939522
Assignee: S.P.C.M. SA
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C  E | IPC C  E

Claim 0:
1. A method for enhancing oil recovery in a subterranean carbonate formation comprising injecting into said subterranean carbonate formation an aqueous composition comprising at least one water-soluble polymer, wherein the water-soluble polymer is an amphoteric polymer containing acrylamidopropyltrimethylammonium chloride and at least one anionic monomer, and wherein the acrylamidopropyltrimethylammonium chloride in the water-soluble polymer has a number of polymeric units comprising between 20 and 99.9 mol % relative to total number of moles of monomer units of the water-soluble polymer.