Resin plugging agent for anti-co2 pollution oil-based drilling fluid and preparation method and application thereof

The prepared resin plugging agent solved the problem of wellbore instability caused by CO2 pollution in deep and ultra-deep wells, and achieved effective plugging and wellbore stabilization under high temperature and high salinity conditions.

CN119708317BActive Publication Date: 2025-10-10CHINA UNIV OF PETROLEUM (EAST CHINA)
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Patent Information

Application Number
CN202411548186.4
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-11-01
Publication Date
2025-10-10
Estimated Expiration
2044-11-01

AI Technical Summary

Technical Problem

When existing drilling fluids encounter CO2 contamination in deep and ultra-deep wells, the plugging agents are prone to failure, causing well wall instability and making it difficult to effectively seal micropores. Traditional plugging agents are also prone to failure under high temperature and high salinity conditions.

Method used

Using styrene, hydroxyethyl methacrylate, long-chain alkyl acrylate, triallyl isocyanurate, emulsifier and initiator as raw materials, a resin plugging agent is formed through emulsification and reaction, which can effectively block micropores in CO2-polluted environments and enhance adhesion and temperature resistance.

Benefits of technology

Significantly reduce drilling fluid loss, improve plugging effect, improve wellbore stability, reduce the impact of CO2 on drilling fluid, and adapt to changes in the size and shape of formation pores and microcracks.

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Abstract

The application provides a resin plugging agent for anti-CO2 pollution oil-based drilling fluid and a preparation method and application thereof. The resin plugging agent for anti-CO2 pollution oil-based drilling fluid is prepared from the following raw materials in parts by mass: styrene 10-50 parts, hydroxyethyl methacrylate 8-20 parts, long-chain alkyl acrylate 1-10 parts, triallyl isocyanurate 0.01-2 parts, emulsifier 0.1-1.5 parts, initiator 1-5 parts, and water 50-200 parts. The application also provides a preparation method of the resin plugging agent. The resin plugging agent can significantly improve the plugging property of the oil-based drilling fluid, has excellent CO2 pollution capacity, can significantly reduce the filtration loss of the drilling fluid, effectively plugs the filtration loss of the micro-porous seam drilling fluid, effectively plugs the micro-porous seam, and improves the well wall instability problem of the oil-based drilling fluid.
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