Anti-fatigue carbon dioxide corrosion resistant cement slurry for well cementation, preparation method and application thereof

By combining carbon dioxide-modified slag powder and core-shell structured polymer microspheres, the corrosion and fatigue resistance of cement rings in high-concentration, high-pressure carbon dioxide environments has been solved, achieving excellent impact toughness and long-term corrosion resistance of cement stone, and ensuring the long-term sealing integrity of the wellbore.

CN121735588BActive Publication Date: 2026-06-05SHAANXI YANCHANG PETROLEUM GRP
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Patent Information

Application Number
CN202610239678.8
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2026-02-28
Publication Date
2026-06-05
Estimated Expiration
2046-02-28

AI Technical Summary

Technical Problem

Existing technologies cannot simultaneously ensure the corrosion resistance and fatigue resistance of cement sheaths in high-concentration, high-pressure carbon dioxide environments, leading to seal integrity failure and wellbore damage, which affects the service life of oil and gas wells.

Method used

A combination of carbon dioxide-modified slag powder, stress buffer, and fiber toughening agent is used to form core-shell structured polymer microspheres, which synergistically enhance the impact toughness and stress buffering capacity of cement stone. The modification treatment reduces the porosity and active sites of cement stone, generating stable corrosion-resistant products.

Benefits of technology

It significantly improves the impact toughness and carbon dioxide corrosion resistance of cement stone, extends the service life of oil and gas wells, and meets the long-term sealing requirements of complex downhole environments.

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Abstract

The application discloses an anti-fatigue carbon dioxide corrosion resistant cementing cement slurry and a preparation method and application thereof. The cementing cement slurry is composed of the following raw materials in parts by weight: oil well cement 90-100 parts, carbon dioxide modified slag powder 8-15 parts, stress buffer 5-12 parts, fiber toughening agent 0.4-0.8 parts, dispersing agent 0.5-3 parts, fluid loss reducer 1.5-2.5 parts, and water 40-50 parts. The stress buffer is a polymer microsphere with a core-shell structure, the inner core is a styrene-butadiene copolymer, and the outer shell is an epoxy resin grafting layer. The average particle size of the stress buffer is 20-50 microns. The cement formed after the cementing cement slurry is consolidated has excellent impact toughness, stress buffering capacity and carbon dioxide corrosion resistance.
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