预钻孔热探头测试设备的研制与测试_刘益平.pdf （点击标题查看论文）

电力勘测设计

DOI: 10.13500/j.dlkcsj.issn1671-9913.2023.05.009

预钻孔热探头测试设备的研制与测试

刘益平，陈华治，张勇

（1.中国能源建设集团江苏省电力设计院有限公司，江苏 南京 211102;

2.中国电力工程顾问集团华北电力设计院有限公司，北京 100120)

摘要：近年来，浅层地热资源开发利用取得较大发展，浅层岩土体热物性参数的快速准确获取是高效利用浅层地热能的重要前提。为完善浅层地热能勘察原位测试设备，基于旁压仪和地埋管换热器工作原理，研制开发预钻孔热探头测试设备，该设备包括热传导探头、压力控制系统、温度控制系统、一体化转换控制装置和同轴导压管连接管路。建立热传导探头三维传热数值仿真分析模型，基于温度消散原理，提出预钻孔热探头的岩土体导热系数测试方法。分别开展干燥和饱和状态下标准砂的预钻孔热探头室内模型试验和导热测试仪对比试验，预钻孔热探头的测试结果为0.495W/(m·℃)和0.833W/(m·℃),导热测试仪测试结果为0.458W/(m·℃)和0.807W/(m·℃),两种方法测试相对误差分别为8.1%和3.2%,验证预钻孔热探头测试设备和温度消散原理测试岩土体导热系数的可靠性。该原位测试设备不但可以用于地热勘察中地层的导热系数测试，也可用于岩体地下工程中围岩的导热系数测试，具有广阔应用前景。

关键词：浅层地热能；预钻孔热探头；原位测试；导热系数

中图分类号：P642 文献标志码：A 文章编号：1671-9913(2023)05-44-08

Development and Test of Pre-drilling Thermal Probe in-site Test Equipment

LIU Yiping',CHEN Huazhi2,ZHANG Yong'

（1.China Energy Engineering Group Jiangsu Power Design Institute Co.,Ltd.,Nanjing 211102,China;

2.North China Power Engineering Co.,Ltd.of China Power Engineering Consulting Group, Beijing 100120, China)

Abstract: In recent years, the development and utilization of shallow geothermal resources have made great progress. The rapid and accurate acquisition of thermal physical parameters of rock and soil is an important prerequisite for the efficient utilization of shallow geothermal energy. In order to improve the in-situ testing equipment for shallow geothermal energy exploration, based on the working principle of pressuremeter and ground heat exchanger, a pre-drilling thermal probe in-site test equipment is developed. The test equipment includes thermal probe, pressure control system, temperature control system,integrated conversion control device and coaxial pressure pipe connecting pipeline.A three-dimensional heat transfer numerical simulation model of thermal probe is established. Based on the principle of temperature dissipation, a test method for the thermal conductivity of rock and soil with pre-drilling thermal probe is proposed. The thermal conductivity of dry sand and saturated sand measured by the pre-drilling thermal probe is 0.495 W/m·℃ and 0.833 W/m·℃,respectively,and that of dry sand and saturated sand measured by thermal conductivity tester is 0.458 W/m·℃ and 0.807 W/m·℃,respectively.

The relative errors of the two methods are 8.1% and 3.2%, respectively,the reliability of the pre-drilled thermal probe test equipment and the principle of temperature dissipation to test the thermal conductivity of rock and soil is verified. The in-situ test equipment can be used not only forthermal conductivity test of strata in geothermal energy exploration, but also for thermal conductivity test of surrounding rock in underground rock engineering, and has a broad application prospect.

Keywords:shallow geothermal energy; pre-drilling thermal probe; in-situ test;thermal conductivity

＊收稿日期：2023-02-16

基金项目：浅层地热测试评估与应用关键技术研究，中国能源建设集团规划设计有限公司科研项目（GSKJ2-G01-2021)。