Method for preparing dilute polymer solutions

Abstract From the Canadian patent

A method for preparing dilute aqueous polymer solutions especially, dilute aqueous partially hydrolyzed polyacrylamide solutions for use in, secondary and tertiary oil recovery processes. The method comprises producing a concentrated polymer solution in a polymerization reactor and diluting the resulting gel-like, relatively high concentration polymer solution to obtain a free-flowing relatively low concentration, polymer solution by means of a staged dilution process. In each stage an aqueous diluent is combined with the polymer solution to produce a nonuniform mixture which is maintained in a vessel in a quiescent state until the mixture becomes uniform. The stages are repeated as many …