Synthesis method of polyacrylamide for oil displacement

The oil displacement polyacrylamide synthesized by aqueous micellar polymerization solves the problem of viscosity reduction of polyacrylamide in high-temperature and high-salinity reservoirs by utilizing a specific monomer and initiator system, and achieves efficient oil displacement under high-salinity and high-temperature conditions.

CN121517631AActive Publication Date: 2026-02-13SHENGLI OIL FIELD FANGYUAN CHEM IND
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Patent Information

Application Number
CN202610065570.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-01-19
Publication Date
2026-02-13
Estimated Expiration
2046-01-19

AI Technical Summary

Technical Problem

Existing polyacrylamide flooding technology has insufficient resistance to salt, temperature, and shear in high-temperature, high-salt reservoirs, leading to a decrease in viscosity and affecting the oil displacement effect.

Method used

Aqueous micellar polymerization was used to synthesize polyacrylamide for oil displacement. Sodium 3-allyloxy-2-hydroxy-1-propanesulfonate, 1H,1H,2H,2H-octyl perfluoroacrylate and 1-methacryloyloxyadamantane were used as functional monomers, and potassium persulfate-sodium bisulfite solution was used as an initiator. Polyacrylamide with temperature resistance, salt resistance and shear resistance was prepared by polymerization reaction.

Benefits of technology

The prepared polyacrylamide maintains high viscosity and strong shear resistance under high salt and high temperature conditions, effectively reducing oil-water interfacial tension and improving oil displacement efficiency, making it suitable for high-temperature and high-salinity oil reservoirs.

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Abstract

The invention belongs to the technical field of polyacrylamide synthesis, and particularly relates to a synthesis method of polyacrylamide for oil displacement. The synthesis method of the polyacrylamide for oil displacement, disclosed by the invention, comprises the following steps: (1) pre-emulsifying 1H, 1H, 2H, 2H-perfluorooctyl acrylate; (2) preparing a water phase; (3) preparing an organic phase solution; (4) polymerization reaction; and (5) post-treatment. According to the synthesis method of polyacrylamide for oil displacement, acrylamide is used as a main monomer, 3-allyloxy-2-hydroxy-1-propanesulfonic acid sodium salt, 1H, 1H, 2H, 2H-octyl perfluoroacrylate and 1-methacryloyloxy adamantane are used as functional monomers, a potassium persulfate solution-sodium hydrogen sulfite solution is used as an initiator system, and the polyacrylamide for oil displacement is synthesized through a one-step method. The polyacrylamide for oil displacement, which is prepared by adopting a water-phase micelle polymerization method, has temperature resistance, salt resistance and shear resistance.
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