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生产井井间距离对增强型地热系统影响分析
Analysis of the influence of the distance between producing Wells on the enhanced geothermal system
投稿时间:2021-08-09  修订日期:2021-09-20
DOI:
中文关键词:  EGS  生产井井间距离  产出流体温度  产热速率  储层寿命  总产热量
英文关键词:EGS  Spacing between producing Wells  Temperature of produced fluid  Heat production rate  Reservoir life  Total quantity of heat
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
作者单位邮编
唐巨鹏 辽宁工程技术大学 123000
邱于曼 辽宁工程技术大学 123000
摘要点击次数: 46
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中文摘要:
      为揭示生产井井间距离对增强型地热系统(EGS)的影响,以中国青海共和盆地增强型地热系统为研究对象,采用数值模拟方法,建立了考虑生产井井间距离不同的三维热-固-流耦合热采模型。分析得到生产井井间距离为600m,700m,800m,900m,1000m对EGS温度场、产出温度、循环质工流量、产热速率、储层寿命以及总产热量影响规律。研究结果表明:采热初期EGS产出温度与储层温度相同;随着热开采进行,储层裂隙周围岩体温度下降,第15年开始产出温度随开采年限增加而降低,实现热突破;随着热开采的进行,循环工质流量及产热速率逐渐降低,降低幅度逐渐减缓;对比不同不同生产井井间距离模型发现,当生产井井间距离增大时,产出流体温度、产热速率、储层寿命、总产热量逐渐增大。
英文摘要:
      In order to reveal the influence of the distance between producing Wells on the enhanced geothermal system (EGS), a three-dimensional thermal-solid-fluid coupling thermal recovery model considering the different distances between producing Wells was established by numerical simulation with the enhanced geothermal system in Gonghe Basin, Qinghai Province, China as the research object. The effects of the distance between producing Wells of 600m, 700m, 800m, 900m and 1000m on EGS temperature field, production temperature, circulating mass flow rate, heat production rate, reservoir life and total heat production were analyzed. The results show that the production temperature of EGS is the same as the reservoir temperature in the early stage of thermal recovery. With the development of thermal mining, the temperature of rock mass around reservoir fractures decreases, and the output temperature from the 15th year decreases with the increase of mining life, thus achieving a thermal breakthrough. With the development of thermal mining, the flow rate of circulating working medium and the heat production rate decrease gradually, and the reduction range slows down gradually. By comparing different interwell distance models, it is found that when the interwell distance increases, the temperature of produced fluid, heat production rate, reservoir life, and total heat production gradually increase.
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