Composite blocking remover for water injection well

The invention discloses a composite blocking remover for a water injection well. The composite blocking remover comprises the following components in parts by weight: 0.5-2.5 parts of a ZYF-1 anti-swelling agent, 1-3 parts of a rock core treating agent, 1-5 parts of an active agent, 1-5 parts of polyvinyl alcohol, 5-15 parts of organic acid, 5-10 parts of an iron ion complexing agent, 15-25 partsof a sodium hypochlorite solution and 34.5-71.5 parts of water. Aiming at different blockage formation mechanisms, one composite blocking remover is adopted and the blockage problem caused by variousreasons can be solved, the cost is greatly saved, emulsification, organic scale formation, deemulsification and organic scale blockage in an oil storage layer can be effectively prevented, and crude oil extraction and water injection well augmented injection are facilitated. The composite blocking remover has good reservoir transformation characteristics and compatibility with reservoir fluid andis high in blocking removal