岩土分层对中深层U型对接井换热性能的影响

doi:10.13809/j.cnki.cn32-1825/te.2023.06.001

油气藏评价与开发 ›› 2023, Vol. 13 ›› Issue (6): 703-712.doi: 10.13809/j.cnki.cn32-1825/te.2023.06.001

岩土分层对中深层U型对接井换热性能的影响

高小荣¹(),李红岩^1,²,任小庆^1,³(),孙彩霞¹,卢星辰¹,刘林¹,吕强强¹,许勇¹,董文斌¹,王泽沐¹,王荣康¹,苗瑞灿¹

1.中国石化绿源地热能开发有限公司，河北保定 071800
2.西安交通大学能源与动力工程学院，陕西西安 710049
3.中国地质大学（北京）能源学院，北京 100083

收稿日期:2023-04-10 出版日期:2023-12-26 发布日期:2024-01-03
通讯作者: 任小庆（1980—），男，在读博士，高级工程师，主要从事地热勘探开发和地热尾水回灌工作。地址：河北省保定市雄县雄州路746号，邮政编码：071800。E-mail: renxiaoqing.xxsy@sinopec.com
作者简介:高小荣（1976—），男，本科，高级工程师，主要从事地热能开发利用方面研究。地址：河北省保定市雄县雄州路746号，邮政编码：071800。E-mail: gaoxiaorong.xxsy@sinopec.com
基金资助:
中国石化科技项目“‘井下换热’中深层地热能开发技术研究”(JR22010);中国石化集团新星石油有限责任公司科技项目“U型对接井换热技术研究——现场工程配套及性能分析”(10500000-21-ZC0607-0025)

Effect of rock-soil stratification on the heat transfer performance of U-shaped butted well in medium-deep layers

GAO Xiaorong¹(),LI Hongyan^1,²,REN Xiaoqing^1,³(),SUN Caixia¹,LU Xingchen¹,LIU Lin¹,LYU Qiangqiang¹,XU Yong¹,DONG Wenbin¹,WANG Zemu¹,WANG Rongkang¹,MIAO Ruican¹

1. Sinopec Green Energy Geothermal Development Co., Ltd., Baoding, Hebei 071800, China
2. School of Energy and Power Engineering, Xi'an Jiaotong University, Xi’an, Shaanxi 710049, China
3. College of Energy, China University of Geosciences, Beijing 100083, China

Received:2023-04-10 Online:2023-12-26 Published:2024-01-03

摘要/Abstract

摘要：

中深层U型对接式换热井出水温度高、取热能力大、井内流动阻力小，是理想的中深层地热能换热形式。基于热阻串联理论,建立了中深层U型对接式换热井地下换热的分层解析计算模型,并采用实测结果进行了验证。在建立解析模型的基础上,选取关中盆地作为研究区域，分析了地下3 000 m以浅深度范围内的岩土导热系数和体积比热分层变化对中深层U型对接式换热井整个采暖期内出水温度和取热量的影响。结果表明:岩土导热系数分层对地下换热特性有较大影响，根据平均导热系数计算会高估井口出水温度和取热量，偏差值介于6 %~15 %；岩土体积比热分层对地下换热特性影响较小。在中深层U型对接式换热井的设计和传热性能分析中，应考虑地下分层的影响，建议分层数量不低于8层。

关键词: 中深层地热, U型对接式换热井, 传热性能, 岩土分层, 解析模型

Abstract:

The medium-deep geothermal exchanger featuring a U-shaped pipe configuration presents an optimal solution for geothermal energy heat exchange due to its capability to deliver higher temperature water, achieve greater heat extraction rates, and maintain minimal flow resistance. A layered analytical model for such exchanger is established based on the theory of thermal resistance in series methods. Experimental results are employed to validate the accuracy of this layered analytical model. By focusing on the Guanzhong Basin in Shaanxi Province as the focal point of research, the model investigates the influence of subterranean stratification in thermal conductivity and volumetric specific heat on the outlet water temperature and heat extraction rate throughout an entire heating period for a 3 000 m deep geothermal exchanger with U-shaped pipe. The findings reveal that the underground thermal conductivity stratification has a significant impact on the heat transfer performance. A simplistic approach using average thermal conductivity, as opposed to a detailed accounting of layered conductivities, results in an overestimation of outlet water temperature and heat extraction rate by approximately 6 % to 15 %. However, specific heat stratification exerts minimal influence on the subterranean heat transfer dynamics. This underscores the importance of considering the effects of underground thermal property stratification in the design and analysis of the heat transfer performance of a medium-deep geothermal exchanger with U-shaped pipe. For precise modeling and results, it is recommended to segment the underground area into at least eight distinct layers.

Key words: medium-deep geothermal, U-shaped heat transfer butted well, thermal performance, rock-soil stratification, analytical model

中图分类号:

TE09

高小荣, 李红岩, 任小庆, 孙彩霞, 卢星辰, 刘林, 吕强强, 许勇, 董文斌, 王泽沐, 王荣康, 苗瑞灿. 岩土分层对中深层U型对接井换热性能的影响[J]. 油气藏评价与开发, 2023, 13(6): 703-712.

GAO Xiaorong, LI Hongyan, REN Xiaoqing, SUN Caixia, LU Xingchen, LIU Lin, LYU Qiangqiang, XU Yong, DONG Wenbin, WANG Zemu, WANG Rongkang, MIAO Ruican. Effect of rock-soil stratification on the heat transfer performance of U-shaped butted well in medium-deep layers[J]. Petroleum Reservoir Evaluation and Development, 2023, 13(6): 703-712.

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深度/ m	西安凹陷/ （℃/km）	咸礼凸起		临蓝凸起/ （℃/km）	固市凹陷/ （℃/km）	宝鸡凸起/ （℃/km）	蒲城凸起/ （℃/km）
深度/ m	西安凹陷/ （℃/km）	扶风—礼泉断阶/（℃/km）	杨凌—咸阳断阶/（℃/km）	临蓝凸起/ （℃/km）	固市凹陷/ （℃/km）	宝鸡凸起/ （℃/km）	蒲城凸起/ （℃/km）
1 000	36.5		45.1	32.3		28.1	27.1
1 500	30.6	35.2	24.6	28.2	39.2	25.7	26.3
2 000	33.2	33.0	21.8	23.2	38.8		26.0
2 500	31.2	30.5	29.2	29.0	37.6		25.9
3 000	29.7	27.9	25.8		35.9		25.8
4 000	26.5		25.6		31.0		25.6
5 000	25.0				28.0

地层	岩性	导热系数/ [W/（m·K）]	体积比热容/ [J/（kg·K）]
第四系秦川群	砂岩	1.90	1 256
第四系秦川群	粉质黏土	1.75	1 433
新近系蓝田灞河组	砂岩	3.00	1 500
	粉砂岩	1.89	1 000
	砂质泥岩	1.40	994
	泥岩	2.09	1 289
新近系高陵群	粗砂岩	1.97	1 072
	细砂岩	1.84	761
	砂质泥岩	1.41	1 006
古近系白鹿原组	砂岩	1.30	939
古近系白鹿原组	泥岩	1.28	1 128
古近系红河组	砂质泥岩	1.92	933

岩土分层对中深层U型对接井换热性能的影响

Effect of rock-soil stratification on the heat transfer performance of U-shaped butted well in medium-deep layers

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