中深层地热井固井导热水泥导热系数研究

doi:10.11896/cldb.19030004

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Abstract The cement-based material with a higher thermal conductivity plays an essential role for the efficient and stable operation of geothermal well. To solve the problem of low thermal conductivity of cement-based materials in geothermal well, the thermal conductivity model of cement for medium and deep geothermal well is established on the basis of previous studies. The effects of quartz powder and alumina powder on thermal conductivity of cement-based materials are studied experimentally in this work. The influence of volume fraction, particle shape and particle size of filling material on thermal conductivity of cement-based materials is studied by the numerical simulation. The results show that after adding quartz powder and alumina powder, the thermal conductivity of cement-based materials is improved to some extent. According to the model, the upper limit of thermal conductivity of cement-based materials is established. With the increase of volume fraction of filling materials, the thermal conductivity increases continuously. Improvement of thermal conductivity by filling spherical particles is worse than cubic ones. Adding small particles with small particle size helps to improve the thermal conductivity of cement-based materials. In addition, the reasonable mix of filler particle sizes can make the same filler ratio achieve different thermal conductivity enhancement effects.When the particle shape of filling materials is the same or the particle size of filling materials is different, the enhancement effect of thermal conductivity is related to the distribution of filling materials.

Key words： heat conductive cement enhancement of heat transfer model powders numerical simulation

Published: 06 November 2020

CLC number:

TU528.53

Fund:Special Fund for Authors of National Excellent Doctoral Dissertations in Institutions of Higher Learning (201440), Special Funds for Basic Scientific Research Operating Expenses of Central Universities (2242015R30004).

About author:: Yao Fang, a postgraduate student of the School of Energy and Environment, Southeast University, is mainly engaged in the research of cement for medium and deep geothermal well.
Yong Zhang,associate professor, School of Energy and Environment in Southeast University. He is mainly engaged in the thermochemical transformation of biomass energy, pollutant control and numerical simulation of multi-phase flow, focusing on the efficient utilization of medium and deep geothermal well.

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	FANG Yao
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	RAN Zhenzhen

Cite this article:

FANG Yao,ZHANG Yong,RAN Zhenzhen. Thermal Conductivity of Cementing Conductive Cement in Medium and Deep Geothermal Well[J]. Materials Reports, 2020, 34(20): 20028-20033.

URL:

http://www.mater-rep.com/EN/10.11896/cldb.19030004 OR http://www.mater-rep.com/EN/Y2020/V34/I20/20028

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