Calculation model and influence factors of thermal conductivity of composite cement-based materials for geothermal well

IF 2.9 2区 地球科学 Q3 ENERGY & FUELS
Yu Yang, Bo Li, Lulu Che, Menghua Li, Ye Luo, Hang Han
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Abstract

The use of cement-based composites (CBC) with high thermal conductivity for geothermal well cementing is extremely important for the efficient development and use of geothermal energy. Accurate prediction of thermal conductivity can save a lot of experimental costs and time. At present, there is no specific calculation model for the thermal conductivity of CBC. In this study, the microstructure, thermal conductivity model and influencing factors of CBC were investigated by experimental tests, theoretical analysis and numerical simulation. The results showed that the cement-based material could be simplified into a two-layer structure of hydrated and unhydrated layers. Mathematical and numerical models based on the coupled Series model and the Maxwell–Eucken model were established to calculate the thermal conductivity for CBC. The mathematical and numerical models were found to be more accurate by comparison with the conventional models and experimental test results. The cubic packing was more favorable than the spherical packing to improve the thermal conductivity of CBC. The plate material had significant anisotropy. The thermal conductivity of CBC showed a rapid decrease followed by a slow decrease, a decrease followed by a slow increase and finally a rapid decrease, a rapid increase followed by an up and down fluctuation and finally a plateau, respectively, with the increase of filler particle diameter, spacing and curing temperature. Based on these results, the effective methods and future research directions were proposed to maximize the thermal conductivity of geothermal well cementing materials in actual engineering applications. The research findings can provide some technical references for the efficient development of geothermal energy and research on CBC with high thermal conductivity.

地热井复合水泥基材料导热系数的计算模型和影响因素
使用具有高导热性的水泥基复合材料(CBC)进行地热井固井,对于高效开发和利用地热能源极为重要。准确预测导热系数可以节省大量实验成本和时间。目前,CBC 的导热系数还没有专门的计算模型。本研究通过实验测试、理论分析和数值模拟,对 CBC 的微观结构、导热系数模型和影响因素进行了研究。结果表明,水泥基材料可简化为水化层和未水化层两层结构。建立了基于耦合 Series 模型和 Maxwell-Eucken 模型的数学和数值模型来计算 CBC 的导热系数。与传统模型和实验测试结果相比,数学和数值模型更为精确。立方体填料比球形填料更有利于提高 CBC 的导热率。板材料具有明显的各向异性。随着填料颗粒直径、间距和固化温度的增加,CBC 的导热系数分别呈现出先快速下降后缓慢下降、先下降后缓慢上升最后快速下降、先快速上升后上下波动最后趋于平稳的过程。根据这些结果,提出了在实际工程应用中最大限度地提高地热井固井材料导热系数的有效方法和未来研究方向。研究成果可为地热能的高效开发和高导热系数 CBC 的研究提供一定的技术参考。
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来源期刊
Geothermal Energy
Geothermal Energy Earth and Planetary Sciences-Geotechnical Engineering and Engineering Geology
CiteScore
5.90
自引率
7.10%
发文量
25
审稿时长
8 weeks
期刊介绍: Geothermal Energy is a peer-reviewed fully open access journal published under the SpringerOpen brand. It focuses on fundamental and applied research needed to deploy technologies for developing and integrating geothermal energy as one key element in the future energy portfolio. Contributions include geological, geophysical, and geochemical studies; exploration of geothermal fields; reservoir characterization and modeling; development of productivity-enhancing methods; and approaches to achieve robust and economic plant operation. Geothermal Energy serves to examine the interaction of individual system components while taking the whole process into account, from the development of the reservoir to the economic provision of geothermal energy.
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