增强型地热系统不同注采井网参数分析

doi:10.13278/j.cnki.jjuese.20170309

吉林大学学报(地球科学版) ›› 2019, Vol. 49 ›› Issue (3): 797-806.doi: 10.13278/j.cnki.jjuese.20170309

增强型地热系统不同注采井网参数分析

樊冬艳¹, 孙海¹, 姚军¹, 李华锋², 严侠¹, 张凯¹, 张林¹

1. 中国石油大学(华东)石油工程学院, 山东青岛 266580;
2. 中国石油集团测井有限公司长庆分公司, 西安 710201

收稿日期:2017-12-27 出版日期:2019-06-03 发布日期:2019-06-03
通讯作者: 孙海(1984-),男,副教授,博士,主要从事非常规油气、地热资源等数值模拟,E-mail:sunhai@upc.edu.cn E-mail:sunhai@upc.edu.cn
作者简介:樊冬艳(1985-),女,讲师,博士,主要从事裂缝性储层数值模拟、产能及试井分析,E-mail:fandongyan2010@126.com
基金资助:
国家自然科学基金项目（61573018，51774317）；中央高校基本科研业务费专项资金资助（17CX02008A）

Parametric Analysis of Different Injection and Production Well Pattern in Enhanced Geothermal System

Fan Dongyan¹, Sun Hai¹, Yao Jun¹, Li Huafeng², Yan Xia¹, Zhang Kai¹, Zhang Lin¹

1. College of Petroleum Engineering, China University of Petroleum, Qingdao 266580, Shandong, China;
2. Logging Changqing Branch, CNPC, Xi'an 710201, China

Received:2017-12-27 Online:2019-06-03 Published:2019-06-03
Supported by:
Supported by National Natural Science Foundation of China (61573018,51774317) and Fundamental Research Funds for the Central Universities (17CX02008A)

摘要/Abstract

摘要： 针对增强型地热系统中水通过复杂裂缝系统提取干热岩储层热量的过程，基于离散裂缝网络模型热流耦合构建了增强型地热系统的解析模型，利用Laplace变换得到了干热岩储层解析解，分析了在五点井网开采下注采井网参数对出口端温度及热提取的影响。研究结果表明：不同裂缝网络和井网模型下出口端温度下降幅度和热突破的时间不同；在相同裂缝网络下，井距越大，热突破时间越晚，当井距分别为50.0、100.0和150.0 m时，热突破时间分别为2.0、5.2和15.0 a；注水速率越小，温度下降越慢，当注水速率分别为0.1，0.2和0.3 kg/s时，生产20.0 a，温度下降幅度分别为53.0，34.5和26.8℃；通过正交实验分析方法得到注采参数中井距影响最大，其极差为13.15，其次为注水速率和注水温度，井网模型影响最小。

关键词: 干热岩, 增强型地热系统, 离散裂缝网络模型, 热流耦合, 解析模型

Abstract: According to the process of heat extraction of fracture system in enhanced geothermal system (EGS) dry-hot-rock reservoir, a thermal-hydraulic coupling analytical model was established based on the discrete fracture network model. The Laplace transform was used to obtain the analytical solutions. The influence of the parameters of injection and production of five spot pattern was analyzed for the temperature and heat extraction at outlet. The results show that the temperature drop at outlet and the time of thermal breakthrough are different under different fracture network and well types. Under the same fracture network, the larger the fracture spacing is, the later the thermal breakthrough time is. When the fracture spacing is 50.0, 100.0 and 150.0 m, the thermal breakthrough time is 2.0 a, 5.2 a and 15.0 a, respectively. The smaller the injection rate is, the slower the temperature decreases. When the injection rate is 0.1, 0.2 and 0.3 kg/s, in production of 20.0 a, the temperature decreases by 53.0, 34.5, and 26.8℃, respectively; Orthogonal experimental analysis shows that well spacing has the greatest influence on injection-production parameters with a range of 13.15, followed by injection rate and injection temperature, while well type has smallest influence.

Key words: hot-dry-rock, enhanced geothermal system (EGS), discrete fracture network model, thermal-hydraulic coupled, analytical model

中图分类号:

TK521

樊冬艳, 孙海, 姚军, 李华锋, 严侠, 张凯, 张林. 增强型地热系统不同注采井网参数分析[J]. 吉林大学学报(地球科学版), 2019, 49(3): 797-806.

Fan Dongyan, Sun Hai, Yao Jun, Li Huafeng, Yan Xia, Zhang Kai, Zhang Lin. Parametric Analysis of Different Injection and Production Well Pattern in Enhanced Geothermal System[J]. Journal of Jilin University(Earth Science Edition), 2019, 49(3): 797-806.

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增强型地热系统不同注采井网参数分析

Parametric Analysis of Different Injection and Production Well Pattern in Enhanced Geothermal System

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