废弃油气井改造地热井换热性能分析及内管设计优化

doi:10.13809/j.cnki.cn32-1825/te.2024.06.006

油气藏评价与开发 ›› 2024, Vol. 14 ›› Issue (6): 864-871.doi: 10.13809/j.cnki.cn32-1825/te.2024.06.006

废弃油气井改造地热井换热性能分析及内管设计优化

金光¹^,²(), 滕宏泉¹^,², 郭鸿¹^,², 夏晴³, 申振坤⁴, 刘强⁴, 李双涛⁴, 牛剑波⁴, 蔡皖龙³()

1.陕西省地调院水工环地质调查中心，陕西西安 710068
2.陕西省城市地质与地下空间工程技术研究中心，陕西西安 710068
3.西安交通大学人居环境与建筑工程学院，陕西西安 710049
4.中国石油长庆油田第五采油厂，陕西西安 710000

收稿日期:2024-04-10 发布日期:2024-12-10 出版日期:2024-12-26
通讯作者: 蔡皖龙 E-mail:wanlongcai@mail.xjtu.edu.cn
作者简介:金光（1982—），男，本科，高级工程师，主要从事水工环境地质方面工作。地址：陕西省西安市碑林区友谊西路243号陕西省水工环地质调查中心，邮政编码：710068。E-mail：303198096@qq.com
基金资助:
国家自然科学基金项目“中深层地埋管群取储热岩土热运移机理及能效调控方法研究”(52306274);中国博士后基金项目“地埋管群取储热长期运行换热机理及耦合热泵系统设计优化方法研究”(2023TQ0262);陕西省博士后基金项目“实际运行场景下中深层地埋管供热系统设计方法重构”(2023BSHYDZZ27);陕西省城市地质与地下空间工程技术研究中心和陕西省公益性地质调查项目“陕北废弃油气井地热能开发利用研究”(202116)

Analysis of heat exchange performance and optimization of inner pipe design in geothermal wells reconstructed from depleted oil and gas wells

JIN Guang¹^,²(), TENG Hongquan¹^,², GUO Hong¹^,², XIA Qing³, SHEN Zhenkun⁴, LIU Qiang⁴, LI Shuangtao⁴, NIU Jianbo⁴, CAI Wanlong³()

1. Shaanxi Hygrogeology Engineering Environment, Shaanxi Institute of Geological Survey, Xi’an, Shaanxi 710068, China
2. Shaanxi Engineering Technology Research Center for Urban Geology and Underground Space, Xi’an, Shaanxi 710068, China
3. School of Human Settlements and Civil Engineering, Xi’an Jiaotong University, Xi’an, Shaanxi 710049, China
4. No. 5 Oil Production Company of PetroChina Changqing Oilfield Company, Xi’an, Shaanxi 710000, China

Received:2024-04-10 Online:2024-12-10 Published:2024-12-26

摘要/Abstract

摘要：

中深层地热井钻井成本高昂，利用现有废弃油气井进行地热井改造可大幅度降低钻井成本。研究基于陕北地区某废弃油气井改造地热井换热试验工程参数及测试数据，开展了长期取热性能数值模拟，探讨了内管设计参数对取热性能的影响。研究发现内管保温性能提升对地热井取热功率影响随深度增加及流量减少而更加明显，但对于内管管径而言，其对取热性能影响较小，且对深度及流量变化不敏感，因此，总体影响程度有限。此外，研究量化了内管管材选取对系统全生命周期经济性的影响，结果表明：给定工况下，内管热导率从0.2 W/（m·K）降至0.02 W/（m·K），一个供暖季内地热井埋管出口水温可提升0.66 ℃，但全生命周期平均供热成本增加了0.035元/（kW·h），投资回收期延长了1.83 a。因此，考虑采用高保温性能内管材料增益作用有限，建议应在优先考虑耐温承压条件下进行废弃油气井改造地热井内管设计。

关键词: 废弃油气井, 地热提取, 内管材料, 取热性能, 生命周期分析

Abstract:

Drilling medium-deep geothermal wells is costly, but converting existing depleted oil and gas wells into geothermal wells can significantly reduce these costs. This study analyzed heat extraction performance based on the engineering parameters and test data of a geothermal well reconstructed from a depleted oil and gas well in the northern Shaanxi region. Long-term heat extraction performance was simulated numerically to explore the impact of inner pipe design parameters. The study found that improving the thermal insulation of the inner pipe had a more significant impact on geothermal well heat extraction power as depth increased and flow rate decreased. However, the diameter of the inner pipe had a minimal influence on heat extraction performance and was less sensitive to changes in depth and flow rate, resulting in a limited overall impact. Additionally, the study quantified the effect of inner pipe material selection on the system's economic performance throughout its life cycle. Results indicated that reducing the inner pipe's thermal conductivity from 0.2 W/（m·K） to 0.02 W/（m·K） under certain working conditions could increase the outlet water temperature by 0.66 °C during one heating season. However, it also raised the average heating cost by 0.035 RMB/（kW·h） and extended the payback period by 1.83 a. Therefore, considering the limited benefits of using high-insulation inner pipe materials, it is recommended to prioritize temperature and pressure resistance when designing inner pipes for geothermal wells reconstructed from depleted oil and gas wells.

Key words: depleted oil and gas wells, geothermal extraction, inner pipe material, heat extraction performance, life cycle analysis

中图分类号:

TU833

金光,滕宏泉,郭鸿等. 废弃油气井改造地热井换热性能分析及内管设计优化[J]. 油气藏评价与开发, 2024, 14(6): 864-871.

JIN Guang,TENG Hongquan,GUO Hong, et al. Analysis of heat exchange performance and optimization of inner pipe design in geothermal wells reconstructed from depleted oil and gas wells[J]. Petroleum Reservoir Evaluation and Development, 2024, 14(6): 864-871.

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类型	参数	选值
钻孔	钻孔直径/m	0.241 6
钻孔	钻井深度/m	2 300
地热井	内管内径/m	0.062
	内管外径/m	0.089
	内管壁厚/m	0.013 5
	内管热导率（PE-RT管）/[W/（m·K）]	0.2
	原始内管综合热导率（真空保温钢管）/[W/（m·K）]	0.02
	外管内径/m	0.124 3
	外管外径/m	0.139 7
	外管壁厚/m	0.001 54
	外管热导率/[W/（m·K）]	45
回填材料	密度/（kg/m³）	1 860
	比热容/[J/（kg·K）]	2 500
	热导率/[W/（m·K）]	1.5
循环流体	密度/（kg/m³）	998
	比热容[J/（kg·K）]	4 190
	热导率/[W/（m·K）]	0.6
	进口水温/℃	15
	流量/（m³/s）	0.005 56
	动力黏度/[kg/（m·s）]	0.000 931

热导率/ [W/（m·K）]	初投资/ 万元	运行费用/ 万元	15 a系统总供热量/ GJ	平均供热成本/ [元/（kW·h）]	15 a供暖收益/ 万元	15 a减排收益/ 万元	15 a总收益/ 万元	投资回收期/ a
0.2	72	152.15	84 870.53	0.107	427.09	9.07	436.16	2.84
0.02	152	179.13	91 320.27	0.142	459.54	14.23	473.77	4.67

废弃油气井改造地热井换热性能分析及内管设计优化

Analysis of heat exchange performance and optimization of inner pipe design in geothermal wells reconstructed from depleted oil and gas wells

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