A synergistic supramolecular inclusion polymer oil displacement system, and a preparation method and application thereof

By combining specific types of host polymers, guest amphiphilic polymers, and amphoteric surfactants, an enhanced supramolecular inclusion polymer flooding system is formed, which solves the problems of viscosity reduction and insufficient interfacial tension under high temperature and high salinity, and achieves a high-efficiency improvement in crude oil recovery.

CN117946652BActive Publication Date: 2026-07-24CHINA UNIV OF PETROLEUM (EAST CHINA)
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Patent Information

Application Number
CN202311700382.4
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-12-12
Publication Date
2026-07-24
Estimated Expiration
2043-12-12

AI Technical Summary

Technical Problem

Existing supramolecular inclusion polymer flooding systems suffer from reduced viscosity, high cost, limited ability to reduce oil-water interfacial tension, low oil washing efficiency, and poor crude oil recovery under high temperature and high salinity conditions.

Method used

By employing specific types of host polymers, guest amphiphilic polymers, and amphoteric surfactants, an enhanced supramolecular inclusion polymer oil displacement system is formed through host-guest inclusion and electrostatic interactions, thereby reducing the polymer concentration used, increasing viscosity, and reducing interfacial tension.

Benefits of technology

Achieving high viscosity and ultra-low interfacial tension at low concentrations improves swept volume and oil washing efficiency, significantly enhancing crude oil recovery.

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Abstract

The application provides a synergistic supramolecular inclusion polymer oil displacement system and a preparation method and application thereof. The synergistic supramolecular inclusion polymer oil displacement system comprises the following raw materials: a host polymer, a guest amphiphilic polymer, an amphoteric surfactant and mineralized water; the host polymer is a beta-cyclodextrin polymer; the guest amphiphilic polymer is a salt-tolerant adamantyl amphiphilic polymer; and the amphoteric surfactant is selected from betaine type amphoteric surfactants. The application takes specific types of host polymers, specific types of guest amphiphilic polymers and specific types of surfactants as building units, forms a synergistic supramolecular inclusion polymer oil displacement system through host-guest inclusion and electrostatic interaction and other non-covalent bond forces, can reduce the polymer use concentration and cost, and has the performances of high viscosity and ultra-low interfacial tension, can effectively improve the oil recovery ratio by improving the sweep volume and oil washing efficiency.
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