Oil displacement agent and process for preparing the same

摘要

The present invention relates to a new type of oil displacement agent and the process for preparing the same. The oil displacement agent is formed of a polyacrylamide-based polymer characterized by a partly crosslinked and partly branched structure, wherein said polyacrylamide-based polymer is obtained by aqueous copolymerization of acrylamide and N,N-dimethylaminoethyl methacrylate as a functional monomer, in the presence of a redox initiator system.

主权项

1. A process for preparing an oil displacement agent derived from a polyacrylamide-based polymer, said polyacrylamide-based polymer comprising a partly crosslinked and partly branched structure, the process comprising:
forming an aqueous solution comprising monomers, said monomers consisting of N,N-dimethylaminoethyl methacrylate and acrylamide; copolymerizing said monomers in said aqueous solution, thereby obtaining the polyacrylamide-based polymer; wherein a content of crosslinked gel in the polyacrylamide-based polymer is from 30% to 40%; wherein said copolymerization is performed in an aqueous medium, under an inert gas, in the presence of a redox initiator system consisting of potassium persulfate and sodium bisulfite; and wherein a mass ratio of acrylamide to N,N-dimethylaminoethyl methacrylate is 100:0.15-1.