Dendrimer composition for preventing gas channeling and carbon sequestration, hydrogel and preparation method and application thereof

By combining dendritic macromolecules with NaCMC to form a three-dimensional cross-linked network, and utilizing the CO2-responsive protonation effect, the problem of insufficient sequestration rate in CO2 oil displacement and storage is solved, achieving a synergistic effect of efficient plugging and carbon fixation.

CN121950276APending Publication Date: 2026-05-01SICHUAN UNIV
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Patent Information

Application Number
CN202610016851.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-01-07
Publication Date
2026-05-01

AI Technical Summary

Technical Problem

Existing CO2 flooding and storage technologies suffer from insufficient CO2 storage rates and inadequate gel strength of CO2 thickening polymers, making it difficult to effectively block high-permeability channels and resulting in decreased oil displacement efficiency.

Method used

Dendritic macromolecules are combined with sodium carboxymethyl cellulose (NaCMC) to form polyamine compounds through iterative Michael addition reactions of ester and amine compounds, forming a three-dimensional cross-linked network. The electrostatic interaction between CO2-responsive protonated cationic quaternary ammonium salt and NaCMC is utilized to achieve the transformation of the solution into a gel, blocking hypertonic channels and fixing carbon.

Benefits of technology

It achieves efficient sealing of high-permeability channels, improves oil recovery and underground storage rates by CO2 displacement of low-permeability channels, realizes efficient synergy between CO2 oil displacement and storage processes, and has excellent CO2 absorption performance and intelligent response capabilities.

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Abstract

The invention discloses a dendritic macromolecular composition for gas channeling prevention and underground carbon sequestration, hydrogel as well as a preparation method and application of the dendritic macromolecular composition. The dendritic macromolecule composition is prepared from the following components in percentage by weight: 0.06 to 0.4 percent of dendritic macromolecules; 0.8-1.6 wt% of sodium carboxymethyl cellulose, and the balance of water. The dendritic macromolecules are at least one of second-generation and third-generation dendritic macromolecules prepared from ester monomers and amine monomers through iterative Michael addition reaction by taking amino-terminated dendritic macromolecules as cores; the ester monomer is methyl acrylate; the amine monomer is selected from one of tris (2-aminoethyl) amine, diethyltriamine and triethyltetramine. CO2 is introduced into the composition to form hydrogel with a three-dimensional network structure, the hydrogel has high-density active sites, and the reaction efficiency with CO2 can be remarkably improved, so that long-term channeling sealing and carbon sequestration performance is exerted in the CO2-EOR process, the problem of oil displacement efficiency reduction caused by gas channeling is relieved, and blocking-sealing integrated carbon sequestration is realized.
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