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

Abstract

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

CLC Number:

TU833

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

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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References 31

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