Phosphonate-containing polymers for controlling scale in underground petroleum-containing formations and equipment associated therewith

摘要

A method of removing from and preventing scale from depositing in underground petroleum containing formations and upon equipment used to inject high brine scale forming waters into such formations which comprises treating such waters with a scale inhibiting amount of an acrylic acid polymer which contains from 0-95 mole percent of acrylamide and from 1-30 mole percent of amido C.sub.1 -C.sub.6 alkyl phosphonate groups from the group consisting of:PPa) Amidomethyl phosphonate groups,PPb) Alpha-hydroxy-beta-amidoethyl phosphonate groups,PPc) Alpha-hydroxy-beta-amidoisopropyl phosphonate groups, and,PPd) Amidopropyl phosphonate groups said polymer having a molecular weight range between 1,000-100,000.