深层埋管换热岩土温度响应及影响半径

doi:10.13809/j.cnki.cn32-1825/te.2022.06.004

摘要/Abstract

摘要：

为了分析深层埋管换热时的岩土温度响应及换热影响半径，研究结合西安某个实际深层埋管供暖工程，基于钻井测井温度、岩土岩性解释以及现场实验建立了埋管换热的全尺寸数值模型。通过对埋管在5 a，即5个供暖期和4个恢复期换热的数值分析，给出了埋管周围岩土温度波动（ΔT）在不同深度上随运行时间的变化情况。在此基础上，考虑到理论研究及工程应用，选择了3种不同的ΔT限值来确定埋管的换热影响半径，同时分析了影响半径的影响因素。结果表明，在ΔT限值足够小至接近0时，埋管换热的影响半径主要受埋管周围岩土自身参数的影响；当ΔT限值增大时，影响半径主要受ΔT限值的影响。

关键词: 地热能, 深层埋管换热, 岩土温度响应, 换热影响半径, 数值模型

Abstract:

In order to analyze the ground temperature response and thermal effect radius of the heat transfer of the deep buried pipe, a full-scale numerical model of buried pipe heat transfer is established based on the well logging temperature, ground lithology interpretation, and field heat transfer experiments of an actual deep-buried pipe heating project in Xi’an. By the numerical analysis of the heat transfer of the buried pipes in five years, namely five heating periods and four recovery periods, the variation of ground temperature fluctuation （ΔT） around the buried pipe at different depths with running time is summarized. On this basis, by considering the theoretical research and engineering application, three different ΔT limits are selected to determine the thermal effect radius, and the factors affecting the thermal effect radius are analyzed. The results show that when ΔT limit is small enough to close to zero, the thermal effect radius is mainly affected by the geotechnical parameters around the buried pipe, and when ΔT limit increases, the thermal effect radius is mainly affected by ΔT limit.

Key words: geothermal energy, deep-buried pipe heat exchange, ground temperature response, thermal effect radius, numerical model

中图分类号:

TE965

李超,江超,官燕玲等. 深层埋管换热岩土温度响应及影响半径[J]. 油气藏评价与开发, 2022, 12(6): 859-868.

Chao LI,Chao JIANG,Yanling GUAN, et al. Ground temperature response and thermal effect radius of heat transfer of deep buried pipe[J]. Petroleum Reservoir Evaluation and Development, 2022, 12(6): 859-868.

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径向距离（m）	ΔT（℃）
径向距离（m）	第一年供暖期结束	第一年恢复期结束	第二年供暖期结束	第二年恢复期结束	第三年供暖期结束	第三年恢复期结束	第四年供暖期结束	第四年恢复期结束	第五年供暖期结束
14.76	0.001	0.049	0.070	0.130	0.150	0.204	0.221	0.269	0.283
16.25	0	0.030	0.048	0.094	0.114	0.158	0.177	0.217	0.233
17.89	0	0.016	0.031	0.065	0.083	0.119	0.137	0.170	0.186
19.70	0	0.008	0.018	0.043	0.057	0.086	0.102	0.130	0.145
21.69	0	0.004	0.010	0.026	0.037	0.060	0.072	0.096	0.108
23.69	0	0.001	0.005	0.016	0.024	0.041	0.050	0.070	0.080
25.69	0	0.001	0.002	0.009	0.015	0.028	0.035	0.050	0.059
27.69	0	0	0.001	0.005	0.009	0.018	0.024	0.036	0.042
29.70	0	0	0	0.003	0.005	0.012	0.016	0.025	0.030
31.70	0	0	0	0.002	0.003	0.008	0.010	0.018	0.022
33.70	0	0	0	0.001	0.002	0.005	0.007	0.012	0.015
35.70	0	0	0	0	0.001	0.003	0.004	0.008	0.010
37.71	0	0	0	0	0	0.002	0.003	0.005	0.007
39.71	0	0	0	0	0	0.001	0.002	0.004	0.005
41.71	0	0	0	0	0	0.001	0.001	0.002	0.003
43.71	0	0	0	0	0	0	0.001	0.001	0.002
45.71	0	0	0	0	0	0	0	0.001	0.001
47.72	0	0	0	0	0	0	0	0.001	0.001

埋管深度（m）	影响半径（m）
埋管深度（m）	第一年供暖期结束	第一年恢复期结束	第二年供暖期结束	第二年恢复期结束	第三年供暖期结束	第三年恢复期结束	第四年供暖期结束	第四年恢复期结束	第五年供暖期结束
500	14.76	25.69	29.70	35.70	39.71	43.71	45.71	49.72	51.72
1 000	14.76	23.69	27.69	33.70	35.70	41.71	43.71	45.71	47.72
1 500	14.76	25.69	27.69	33.70	37.71	41.71	43.71	47.72	49.72
2 000	16.25	29.70	33.70	39.71	43.71	47.72	51.72	55.73	57.73
2 500	14.76	25.69	29.70	35.70	37.71	43.71	45.71	49.72	51.72

埋管深度（m）	影响半径（m）
埋管深度（m）	第一年供暖期结束	第一年恢复期结束	第二年供暖期结束	第二年恢复期结束	第三年供暖期结束	第三年恢复期结束	第四年供暖期结束	第四年恢复期结束	第五年供暖期结束
500	7.48	12.16	12.16	14.76	16.25	17.89	19.70	19.70	21.69
1 000	9.09	14.76	16.25	17.89	19.70	21.69	23.69	25.69	25.69
1 500	8.25	13.40	16.25	17.89	19.70	21.69	23.69	25.69	25.69
2 000	9.09	14.76	16.25	19.70	19.70	23.69	23.69	25.69	27.69
2 500	10.02	17.89	19.70	23.69	23.69	27.69	29.70	31.70	31.70

埋管深度（m）	影响半径（m）
埋管深度（m）	第一年供暖期结束	第一年恢复期结束	第二年供暖期结束	第二年恢复期结束	第三年供暖期结束	第三年恢复期结束	第四年供暖期结束	第四年恢复期结束	第五年供暖期结束
500	5.58	3.07	6.79	7.48	8.25	9.09	9.09	11.04	11.04
1 000	6.79	9.09	10.02	12.16	13.40	14.76	14.76	16.25	17.89
1 500	6.79	10.02	11.04	13.40	14.76	16.25	16.25	17.89	17.89
2 000	7.48	11.04	12.16	14.76	16.25	17.89	17.89	19.70	19.70
2 500	9.09	13.40	14.76	17.89	19.70	21.69	21.69	23.69	23.69

进水温度工况	影响半径（m）
进水温度工况	第一年供暖期结束	第一年恢复期结束	第二年供暖期结束	第二年恢复期结束	第三年供暖期结束	第三年恢复期结束	第四年供暖期结束	第四年恢复期结束	第五年供暖期结束
GK-7	16.25	29.70	33.70	39.71	43.71	47.72	51.72	55.73	57.73
GK-12	16.25	29.70	33.70	39.71	43.71	47.72	49.72	55.73	57.73
GK-17	16.25	27.69	31.70	39.71	41.71	47.72	49.72	55.73	57.73