Modified lignosulfonate surfactant and application thereof

By combining modified lignin sulfonate surfactants with amphiphilic nano-silica, the interfacial instability problem of chemical flooding agents in high-salt environments was solved, and efficient reservoir recovery was achieved.

CN121405973APending Publication Date: 2026-01-27ANHUI FENGCHEN BIOENGINEERING CO LTD
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Patent Information

Application Number
CN202511849780.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-09
Publication Date
2026-01-27

AI Technical Summary

Technical Problem

Existing chemical flooding agents are prone to interfacial instability and decreased displacement efficiency in high-salt environments, leading to reduced reservoir recovery.

Method used

By designing alkylamide quaternary ammonium salts containing double bonds to perform free radical grafting modification of lignin sulfonate, and combining it with amphiphilic nano-silica and polyacrylamide, a composite oil displacement agent system was constructed to enhance interfacial stability and displacement efficiency.

Benefits of technology

In high-salt environments, oil recovery is significantly improved by synergistic assembly of modified lignin sulfonate surfactants and amphiphilic nano-silica to form a stable interfacial film, thereby enhancing interfacial stability and displacement efficiency.

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Abstract

The invention discloses a modified lignosulfonate surfactant and application thereof, and belongs to the technical field of surfactant preparation.Dimethylaminopropylamine and lauroyl chloride are acylated to obtain an amide intermediate, then the amide intermediate and 2-bromoethyl acrylate are quaternized, a double-bond structure capable of participating in a free radical reaction is introduced, and the modified lignosulfonate surfactant is obtained. The preparation method comprises the following steps: adding alkyl amide quaternary ammonium salt containing double bonds to form alkyl amide quaternary ammonium salt containing double bonds, introducing the double bonds to subsequently realize free radical grafting with lignosulfonate and improve the structural stability and surface activity, and then grafting the quaternary ammonium salt containing double bonds to a lignosulfonate skeleton under the initiation of potassium persulfate to obtain the modified lignosulfonate surfactant. The obtained modified lignosulfonate surfactant is compounded with amphiphilic nano silicon dioxide and polyacrylamide to construct the oil displacement agent, and the oil displacement agent has better interface stability and higher displacement efficiency in a high-salt environment due to the overall synergistic effect.
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