A nano-reinforced siloxane polymer system for CO2 thickening, its preparation method and application

By combining ester-modified siloxane polymers with modified nanomaterials, a synergistic thickening network is formed between the ester-modified siloxane polymers and modified nano-SiO2, solving the problem of unsatisfactory thickening effect of siloxane thickeners in CO2 dry fracturing. This improves temperature resistance, shear resistance, and dispersion stability, making it suitable for CO2 dry fracturing.

CN121914702BActive Publication Date: 2026-06-05CHINA UNIV OF PETROLEUM (EAST CHINA)
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA UNIV OF PETROLEUM (EAST CHINA)
Filing Date
2026-03-26
Publication Date
2026-06-05

AI Technical Summary

Technical Problem

Existing siloxane thickeners have unsatisfactory thickening effects in CO2 dry fracturing, require large amounts of co-solvents, and have poor temperature and shear resistance, leading to increased system costs and environmental burden. Furthermore, nanomaterials tend to agglomerate and settle in CO2, resulting in insufficient dispersion stability.

Method used

Ester-modified siloxane polymers were combined with modified nano-SiO2 and prepared by ring-opening polymerization and addition reaction. The polymers were then mixed with a co-solvent and surface-functionalized nano-SiO2 was added to form a synergistic thickening network.

Benefits of technology

It improves the thickening effect of CO2, enhances temperature resistance and shear resistance, improves dispersion stability, and reduces environmental impact, making it suitable for CO2 dry fracturing.

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Abstract

The present application relates to a kind of for CO2 thickening nano reinforced siloxane polymer system and its preparation method and application, belong to oilfield development technical field.The nano reinforced siloxane polymer system for CO2 thickening, including the following components: ester group modified siloxane polymer, modified nano SiO2 And cosolvent;The mass ratio of ester group modified siloxane polymer and cosolvent is 1:0.5-3;The mass fraction of modified nano SiO2 in the nano reinforced siloxane polymer system for CO2 thickening is 0.3-1.5%.The thickening system of the present application can be used for CO2 dry fracturing, can improve the viscosity of supercritical CO2 And improve its temperature resistance and shear resistance, with good solubility / dispersion stability and application prospect.
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