Clay stabilizer, preparation method and water-based working fluid

By leveraging the synergistic effect of carboxyl groups and quaternary ammonium salt substituents in quaternized chitosan zwitterionic polymers, the technical challenges of clay stabilizers in inhibiting hydration swelling and controlling fine particle migration have been addressed. This has enabled the clay stabilizer to achieve long-term effectiveness and improve the permeability and productivity of conglomerate reservoirs.

CN122444893AActive Publication Date: 2026-07-24CHINA UNIV OF PETROLEUM (BEIJING)
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Patent Information

Application Number
CN202610943670.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-06-29
Publication Date
2026-07-24
Estimated Expiration
2046-06-29

AI Technical Summary

Technical Problem

Existing clay stabilizers are not effective in inhibiting clay hydration and swelling and controlling the migration of fine clay particles, and are prone to clogging problems, making it difficult to meet the development needs of highly water-sensitive conglomerate reservoirs.

Method used

Quaternized chitosan zwitterionic polymer is used as a clay stabilizer. Through the synergistic effect of carboxyl substituents and quaternary ammonium salt substituents, multi-point hydrogen bonds and electrostatic adsorption are formed. Combined with molecular chain bridging and zwitterionic charge regulation, dynamic coating and aggregation of clay particles are achieved, forming stable clusters and inhibiting clay hydration swelling and fine particle migration.

Benefits of technology

It effectively improved the clay stability rate, reduced the probability of clay fine particles entering deep pore throats, increased the permeability and single-well productivity of conglomerate reservoirs, and met the needs of long-term anti-swelling and migration control.

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Abstract

The invention provides a clay stabilizer, a preparation method and a water-based working solution. The clay stabilizer comprises a quaternized chitosan zwitterionic polymer, the quaternized chitosan zwitterionic polymer comprises a chitosan main chain, a carboxyl substituent grafted on the chitosan main chain and a quaternary ammonium salt substituent grafted on the chitosan main chain, the substitution degree of the carboxyl substituent is 60-80%, and the substitution degree of the quaternary ammonium salt substituent is 60-80%. The quaternary ammonium salt substituent accounts for 30-60% of the mass of the quaternized chitosan zwitterionic polymer, and the polydispersity coefficient of the quaternized chitosan zwitterionic polymer is 2.2-2.5. The clay stabilizer has the advantages that the clay stabilizer is capable of inhibiting hydration expansion of clay and coordinating and controlling dispersion, migration and deposition behaviors of fine particles under fluid scouring, dynamic migration regulation and control of the fine particles of the clay are realized, and blockage caused by the fact that the fine particles of the clay enter deep narrow pore throats is reduced.
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