| 地热井固井材料导热性能影响因素 |
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| 引用本文： | 张浩,徐拴海,杨雨,韩永亮,张卫东,李永强.地热井固井材料导热性能影响因素[J].煤田地质与勘探,2020,48(2):195-201. |
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| 作者姓名： | 张浩 徐拴海 杨雨 韩永亮 张卫东 李永强 |
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| 作者单位： | 煤炭科学研究总院,北京 100013;中煤科工集团西安研究院有限公司,陕西 西安 710077;中煤科工集团西安研究院有限公司,陕西 西安 710077 |
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| 基金项目： | 天地科技股份有限公司科技创新基金;科技创新基金 |
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| 摘 要： | 固井材料导热性能是影响地热井取热效果的因素之一。为提升地热井固井材料导热系数,采用正交试验,借助层次分析-指标重复性相关(AHP-CRITIC)混合加权法和极差分析,进行固井材料导热性能研究。结果表明:添加天然鳞片石墨、铁粉和石英砂均可提高固井材料导热系数,其中石墨对导热系数的提升作用最为显著,铁粉次之,石英砂最小;石墨掺量和水固比分别是影响固井材料综合性能的主次要因素;随着石墨掺量递增,其导热系数递增、48h抗压强度和流动度均递减;得出高导热固井材料的优选配合比为:水固比值0.44,石墨、铁粉和石英砂掺量分别占水泥质量的7.5%、3%、2%,其导热系数可达1.87 W/(m-K),较常规固井材料提高约70%。研究成果可为地热能高效开发利用提供参考。
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| 关 键 词： | 地热能 固井材料 导热系数 正交试验 层次分析-指标重复性相关(AHP-CRITIC)混合加权法 极差分析 |
| 收稿时间： | 2019-12-16 |
Influencing factors of thermal conductivity of cementing materials for geothermal wells |
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| ZHANG Hao,XU Shuanhai,YANG Yu,HAN Yongliang,ZHANG Weidong,LI Yongqiang.Influencing factors of thermal conductivity of cementing materials for geothermal wells[J].Coal Geology & Exploration,2020,48(2):195-201. |
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| Authors: | ZHANG Hao XU Shuanhai YANG Yu HAN Yongliang ZHANG Weidong LI Yongqiang |
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| Institution: | (China Coal Research Institute,Beijing 100013,China;Xi’an Research Institute Co.Ltd.,China Coal Technology and Engineering Group Corp.,Xi’an 710077,China) |
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| Abstract: | The thermal conductivity of cementing materials is one of the factors that affect the heat removal effect of geothermal wells. In order to improve the thermal conductivity of cementing materials for geothermal wells, orthogonal test was used to study the thermal conductivity of cementing materials based on the AHP-CRITIC mixed weighting method and range analysis. The results show that the thermal conductivity of cementing materials can be improved by adding natural flake graphite, iron powder and quartz sand. The content of graphite and the ratio of water to solid are the primary and secondary factors that affect the comprehensive properties of cementing materials. With the increase of graphite content, the thermal conductivity, the 48 hours compressive strength and the fluidity decreased. The results show that the optimal mix ratio of high thermal conductivity cementing materials is:water solid ratio is 0.44, the amount of graphite, iron powder and quartz sand accounted for 7.5%, 3%, and 2% of the cement mass, respectively, its thermal conductivity can reach 1.87 W/(m·K), which is about 70% higher than conventional cementing materials. It can provide reference for the efficient development and utilization of geothermal energy. |
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| Keywords: | geothermal energy cementing material thermal conductivity orthogonal test AHP-CRITIC mixed weighting method range analysis |
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