兰州盆地 DR2 地热井无干扰换热试验结果与分析

朱俊宇; 杨永辉; 刘文辉; 王 辉; 李 松; 杨建慧

朱俊宇,杨永辉,刘文辉,王辉,李松,杨建慧.兰州盆地 DR2 地热井无干扰换热试验结果与分析[J].甘肃地质,2026,35(1):72-80

兰州盆地 DR2 地热井无干扰换热试验结果与分析

RESULTS AND ANALYSIS OF NONINTERFERENCE HEAT EXCHANGE TEST ON DR2 GEOTHERMAL WELL IN LANZHOU BASIN

DOI：10.27027/j.cnki.ISSN2097-6704.2026.01.009

英文关键词:medium-deep geothermal energy noninterference heat exchange test coaxial casing pipe heat exchange Lanzhou Basin

基金项目:甘肃省科技计划项目（22YF11GA321），甘肃省自然资源厅科技创新项目（202412）资助。

作者	单位
朱俊宇	1. 甘肃省地质矿产勘查开发局第二地质矿产勘查院,甘肃兰州 730020； 2. 甘肃水文地质工程地质勘察院有限责任公司,甘肃兰州 730020；
杨永辉	1. 甘肃省地质矿产勘查开发局第二地质矿产勘查院,甘肃兰州 730020； 2. 甘肃水文地质工程地质勘察院有限责任公司,甘肃兰州 730020；
刘文辉	1. 甘肃省地质矿产勘查开发局第二地质矿产勘查院,甘肃兰州 730020； 2. 甘肃水文地质工程地质勘察院有限责任公司,甘肃兰州 730020；
王辉	1. 甘肃省地质矿产勘查开发局第二地质矿产勘查院,甘肃兰州 730020； 2. 甘肃水文地质工程地质勘察院有限责任公司,甘肃兰州 730020；
李松	1. 甘肃省地质矿产勘查开发局第二地质矿产勘查院,甘肃兰州 730020； 2. 甘肃水文地质工程地质勘察院有限责任公司,甘肃兰州 730020； 3. 甘肃省地热资源勘查开发技术创新中心,甘肃兰州 730020；
杨建慧	4. 兰州热力集团有限公司,甘肃兰州 730020

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中文摘要:

在能源短缺与环境污染的严峻挑战下，地热能作为清洁可再生能源备受关注，“地热开发取热不取水”成为政策导向。针对兰州部分地热井回灌困难导致闲置的问题，本研究以兰州市七里河区彭家坪 DR2 地热井为对象，通过构建以同轴套管换热器系统为核心的井下换热装置开展无干扰换热试验，分析注水流量、进出水温差等参数对换热量及换热效率的影响。结果表明，循环水进出温差、换热效率与注水流量呈负相关，换热量随注水流量和进出水温差的增加均呈现先升后降趋势。确定最佳换热工况为注水流量 11. 40 m3 ／ h、进出水温差 16. 5℃，此时换热量达 215kWh 左右，换热效率为 0. 279。本试验为兰州盆地闲置地热井的有效再利用提供了新思路与数据支撑，对推动地热能清洁高效利用具有重要意义。

英文摘要:

Under the severe challenges of energy shortages and environmental pollution, geothermal energy has attracted significant attention as a clean and renewable energy source. The policy direction of Heat Extraction Without Water Extraction in geothermal development has gained prominence. In response to the issue of difficult reinjection leading to the idling of some geothermal wells in Lanzhou, this study focused on the Pengjiaping DR2 geothermal well in Qilihe District of Lanzhou. A downhole heat exchange device centered on a coaxial casing heat exchanger system was constructed to conduct non -interference heat exchange experiments. The influence of parameters such as water injection flow rate and temperature difference between inlet and outlet on heat exchange capacity and efficiency was analyzed. The results show that the temperature difference between the inlet and outlet of the circulating water, as well as the heat exchange efficiency, are negatively correlated with the water injection flow rate. The heat exchange capacity initially increases and then decreases with the rise in both water injection flow rate and temperature difference between the inlet and outlet. The optimal heat exchange condition was determined to be a water injection flow rate of 11. 40 m3 ／ h and a temperature difference of 16. 5°C between the inlet and outlet, achieving a heat exchange capacity of approximately 215 kWh and a heat exchange efficiency of 0. 279. This experiment provides new ideas and data support for the effective reuse of idle geothermal wells in the Lanzhou Basin, contributing significantly to promoting the clean and efficient utilization of geothermal energy.

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