The invention discloses a multi-functional blocking remover and a preparation method thereof. The multi-functional blocking remover is composed of functional components with different percentage contents and oilfield
produced water, and a front near-well
slug blocking remover, a multi-effect degradation
slug blocking remover and a rear yield increase
slug blocking remover are prepared according to a certain proportion. The multi-functional blocking remover provided by the invention has the advantages of immediate preparation, non-oxidizing property, simple construction process, high gel breaking rate (96.1% or more), wide applicable temperature range (20-120 DEG C), low
corrosion rate (lower than 0.04 g / (m<2>. h), good safety and the like, can effectively remove various blockages such as scale, polymers,
polymer gel and
oil sludge generated in the ASP flooding profile control process, realizes recycling of oilfield
produced water, is beneficial to improving the communication capacity between oil-water wells and delaying
scale deposition, and can achieve multiple effects of dissolving, plug removal, deposition prevention, low-permeability reservoir
pollution reduction, injection increase and
pressure reduction and the like during application.