Product characteristics: Temperature-resistant and salt-resistant polyacrylamide is used to solve the problem of using the sewage from the tertiary oil recovery in the oil field to achieve the recycling of the recovered sewage to benefit the environment. The product uses different pre-hydrolysis and post-hydrolysis processes to achieve different product specifications.Scope of application: This product is suitable for the fields of Daqing Oilfield, Shengli Oilfield, Dagang Oilfield and other tertiary oil recovery polymers for water profile control and water shutoff.Recommended products: SH-2000, EX-2500, SHK-1, SHK-2.