Phase-change microcapsule thermal insulation material for drilling fluid for offshore oil and gas drilling and preparation and application thereof

By using composite phase change microcapsule insulation materials and a wellbore temperature field analytical model in drilling fluid, the thermal conductivity and stability problems of traditional drilling fluids under high temperature and high pressure environments have been solved, achieving efficient temperature control and safe drilling of marine drilling fluids.

CN120966433APending Publication Date: 2025-11-18CHINA UNIV OF PETROLEUM (EAST CHINA)
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Patent Information

Application Number
CN202511025559.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-07-24
Publication Date
2025-11-18

AI Technical Summary

Technical Problem

Traditional drilling fluid systems have low mechanical strength and poor resistance to collapse under high temperature and high pressure environments, which leads to a sharp increase in thermal conductivity. This makes it impossible to effectively control the wellbore temperature, affecting drilling efficiency and causing thermal damage to the reservoir.

Method used

Phase change microcapsule insulation material is used, with n-dodecane and n-tetradecane as the core material, and acetaldehyde, urea and melamine as the wall material to construct a marine high-efficiency water-based drilling fluid system. Temperature control is achieved by dynamically adjusting the amount of insulation material added through the wellbore heat transfer equation and temperature field analytical model.

Benefits of technology

It significantly reduces drilling fluid temperature, improves enthalpy change and temperature range characteristics, provides a wider temperature control range, enhances the thermal insulation and rheological properties of drilling fluid, and ensures the safety and efficiency of the drilling process.

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Abstract

The invention relates to the technical field of offshore oil and gas exploitation, and particularly discloses a phase change microcapsule thermal insulation material for offshore oil and gas drilling fluid as well as preparation and application of the phase change microcapsule thermal insulation material. N-dodecane and n-tetradecane are compounded to serve as a core material, acetaldehyde, urea and melamine react to generate a wall material, a phase change microcapsule is prepared through the technologies of emulsification, prepolymer synthesis and the like, and the phase change microcapsule thermal insulation material is prepared. By combining with a constructed efficient water-based drilling fluid system, the heat conductivity coefficient and the rheological property are optimized, and synergistic improvement of heat insulation and stability is realized. And based on a Hasan shaft energy equation, an unsteady-state shaft heat transfer analytical model is established by applying Laplace conversion, the microcapsule addition amount is dynamically calculated, and the shaft temperature field is precisely regulated and controlled. The problems that a traditional inorganic material is low in mechanical strength and an organic material is poor in thermal stability are solved, the composite material has the advantages of efficient heat insulation, low process cost and high adaptability, and technical support is provided for safe operation of deepwater drilling.
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