A supramolecular hydrogel sealing agent constructed by host-guest interaction and its preparation method and application

The supramolecular hydrogel sealant constructed through the interaction of the host and guest solves the problem of heavy oil sealing and resolving, realizes effective sealing of the heavy oil reservoir and the safety of the wellbore, and has high strength, temperature and pressure resistance and pH response capabilities.

CN119899330BActive Publication Date: 2025-08-12CHINA UNIV OF PETROLEUM (EAST CHINA)
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Patent Information

Application Number
CN202510399678.X
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-04-01
Publication Date
2025-08-12
Estimated Expiration
2045-04-01

AI Technical Summary

Technical Problem

The existing heavy oil sealing materials cannot effectively solve the problem of heavy oil invasion into the wellbore, especially the inability to achieve reversible sealing and reblocking, which affects drilling efficiency and safety.

Method used

The supramolecular hydrogel sealant constructed by the interaction of the host and guest forms a reversible sealing layer under specific conditions through the combination of copolymerization monomers, tanninic acid-grafted polysaccharide aqueous dispersion, crosslinking agent and initiator, which can form a high-strength, high-pressure sealing layer in the wellbore and dissociate and degrade under alkaline conditions.

Benefits of technology

It achieves an effective balance between heavy oil sealing and unblocking, reduces heavy oil invasion into the wellbore, avoids annulus blockage or drilling, and has excellent mechanical properties, temperature and pressure resistance and pH response capabilities, which are suitable for sealing and unblocking of heavy oil reservoirs.

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Abstract

The present invention provides a supramolecular hydrogel sealing agent constructed by host-guest interaction, and its preparation method and application, which belong to the technical field of drilling fluid sealing. The supramolecular hydrogel sealing agent constructed by host-guest interaction of the present invention comprises the following raw materials in percentage by mass: 12-36% copolymerization monomer, 6-10% tannic acid grafted polysaccharide aqueous dispersion, 0.5-1.5% initiator, 0.3-0.6% cross-linking agent, and the balance is water; the total amount of each component is 100%. The raw materials of the present invention are cheap and easy to obtain, the raw material composition is simple, the cost is low, and it is green, safe and environmentally friendly; the preparation method is simple, the conditions are mild, and it is easy to implement. The sealing agent obtained by the present invention has excellent mechanical properties, heat and pressure resistance and outstanding pH degradation ability after cross-linking, can effectively seal the crude oil reservoir to form an integral sealing barrier, and reduce the entry of heavy oil into the wellbore; at the same time, it can effectively realize the degradation of the hydrogel to achieve unsealing.
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