Drilling fluid borehole wall stabilizer, preparation method and application

The drilling fluid wellbore stabilizer, which combines cucurbitacin and cyclodextrin, solved the problem of wellbore instability in deep shale formations, improved the dispersion recovery rate and membrane efficiency of the drilling fluid, and enhanced wellbore stability.

CN121108959APending Publication Date: 2025-12-12SINOPEC OILFIELD SERVICE CORPORATION +2
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Patent Information

Application Number
CN202410755160.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-06-12
Publication Date
2025-12-12

AI Technical Summary

Technical Problem

Existing drilling fluid wellbore stabilizers are not effective in deep shale formations, especially in addressing wellbore instability. Furthermore, traditional chemical plugging agents are pH-sensitive or not widely used, and research on physical plugging agents is still in its infancy.

Method used

Using cucurbitacin and cyclodextrin as the main raw materials, combined with surfactants, organosilicon alcohols and salt bridging agents, a drilling fluid wellbore stabilizer is prepared by mixing, stirring and drying. The cucurbitacin-cyclodextrin composite is used to rapidly adsorb and seal micro-cracks on the wellbore, thereby enhancing wellbore stability.

Benefits of technology

It significantly improves the rolling dispersion recovery rate and membrane efficiency of drilling fluid, and achieves effective wellbore stability, especially in improving the dispersibility and compaction problems in shale formations.

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Abstract

The invention provides a well wall stabilizer for drilling fluid as well as a preparation method and application thereof. The invention provides a well wall stabilizer for drilling fluid. The raw materials of the stabilizer comprise cucurbituril and cyclodextrin, the cucurbituril is an annular cage compound formed by connecting 2n methylene bridges with n glycolurils, and n is selected from 5-20. Wherein cucurbituril is called Q [n] for short. The invention provides a preparation method of a stabilizer. The preparation method of the stabilizer comprises the step of mixing water, cucurbituril, an alkali supply agent, cyclodextrin, a surfactant, organic silanol and a salt bridging agent to obtain the stabilizer. The invention provides the drilling fluid well wall stabilizer prepared from cucurbituril and cyclodextrin, the prepared drilling fluid well wall stabilizer is used in drilling fluid, the rolling dispersion recovery rate of the drilling fluid can reach 65% or above, and the membrane efficiency of the drilling fluid can reach 17% or above.
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Citation Information

Patent Citations

  • Cyclodextrin microspheres for ultra-high temperature filtration reduction in water-based drilling fluids, their preparation method, and applications in water-based drilling fluids.

    CN110257025B