A temperature-sensitive supramolecular host-guest complex in-situ synergistic oil displacement system, a preparation method and application thereof

By constructing a supramolecular synergistic system of silicon-based nanoparticles with cyclodextrin groups on their surface and thermosensitive grafted polymers, the problem of viscosity shear loss in oil displacement systems under high temperature and high salinity conditions was solved, and the efficient application of the oil displacement system in complex reservoirs was realized.

CN121136694BActive Publication Date: 2026-06-02CHINA UNIV OF PETROLEUM (EAST CHINA)
3 Cites 0 Cited by

Patent Information

Application Number
CN202511678928.X
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-11-17
Publication Date
2026-06-02
Estimated Expiration
2045-11-17

AI Technical Summary

Technical Problem

Existing oil displacement systems suffer severe viscosity shear loss under high temperature and high salinity conditions, making it difficult to meet the enhanced oil recovery requirements of complex reservoirs. Furthermore, they lack stage control mechanisms and have poor formation adaptability.

Method used

A supramolecular synergistic system was constructed by using silicon-based nanoparticles with cyclodextrin groups on their surface and thermosensitive grafted polymers. Through the inclusion effect of nanoparticles and grafted polymers, the shear resistance and temperature responsiveness of the system under high temperature and high salt environment were regulated.

Benefits of technology

It improves the thermal stability and shear resistance of the oil displacement system, expands reservoir adaptability and oilfield application range, reduces injection pressure and energy consumption, and improves sweep efficiency and recovery rate.

✦ Generated by Eureka AI based on patent content.
Patent Text Reader

Abstract

This invention provides a thermosensitive supramolecular host-guest inclusion in-situ enhanced oil displacement system, its preparation method, and its application, belonging to the field of oilfield production technology. First, this invention introduces polymerizable monomers onto the surface of nano-silica to prepare silicon-based nanoparticles with cyclodextrin groups on their surface. Then, using hydrophilic monomers acrylamide and weakly hydrophobic monomers diacetone acrylamide as reactants, a thermosensitive copolymer with terminal amino groups is prepared, and this copolymer is used as a grafted side chain to synthesize a thermosensitive graft polymer. Furthermore, through inclusion, a supramolecular synergistic enhancement system of silicon-based nanoparticles and thermosensitive graft polymer is constructed. This ensures the oil displacement system's high-temperature resistance and strong shear loss resistance while achieving temperature-responsive regulation between hydrophilic and hydrophobic properties at both surface and reservoir temperatures. This meets basic production requirements while improving the reservoir adaptability and practical application range of the oil displacement system in oilfields.
Need to check novelty before this filing date? Find Prior Art