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Analyzes of thermal characteristics of a hydrothermal coaxial closed-loop geothermal system in a horizontal well

机译：水平井中热同轴闭环地热系统的热特性分析

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摘要

The effective exploitation of deep hydrothermal resource is an emphasis in the global geothermal industry. A horizontal-well coaxial closed-loop geothermal system (CCGS) is presented to realize its efficient development by significantly increasing the heat exchange area based on a long horizontal well. However, few researchers focus on the complex convection process in the hydrothermal reservoir, making it difficult to effectively evaluate the thermal characteristics of a geothermal system. Therefore, a 3D transient flow and heat transfer model considering the forced and natural convection in the reservoir is established to achieve a comprehensive CCGS analyzes. Then, the flow and temperature fields in the formation with forced and natural convection are compared. The thermal characteristics of the horizontal-well CCGS with and without convection are discussed. Also, the influences of key factors on the heat production of the horizontal-well CCGS are investigated. The differences between the horizontal-well and vertical-well CCGSs in exploiting the hydrothermal resource are analyzed. The results show that the fluid convection in the reservoir, particularly the forced convection, can greatly enhance heat transfer by affecting heat convection. The temperature field in the reservoir may return to the original state before the next heating season when a high convection velocity occurs, which is beneficial to realize 100% sustainable heat production. The horizontal length, permeability, and reverse circulation should be the primary considerations in improving heat extraction. Compared with the limited performance of vertical-well CCGS, the horizontal-well CCGS can fully extract the heat stored in the hydrothermal reservoir via a long horizontal well. The findings provide a vital reference for the CCGS scientific study and engineering application.
机译：对深层水热源的有效开采是全球地热行业的重点。提出了一种水平阱同轴闭环地热系统（CCG）以通过基于长水平井显着增加热交换区域来实现其有效的发展。然而，很少有研究人员专注于水热储层中的复杂对流过程，使得难以有效地评估地热系统的热特性。因此，建立了考虑储层中强制和自然对流的3D瞬态流量和传热模型，以实现全面的CCGS分析。然后，比较具有强制和自然对流的形成中的流动和温度场。讨论了具有和不具有对流的水平井CCG的热特性。此外，研究了关键因素对水平井CCG的热量产生的影响。分析了水平孔和垂直井CCG在利用水热源资源之间的差异。结果表明，储层中的流体对流，特别是强制对流，可以通过影响热对流来大大提高热传递。当发生高对流速度时，储存器中的温度场可以返回到下一个加热季节之前的原始状态，这有利于实现100％可持续的热量生产。水平长度，渗透率和反向循环应该是改善热提取的主要考虑因素。与垂直井CCG的性能有限相比，水平井CCG可以通过长水平阱充分提取存储在水热储存器中的热量。该研究结果为CCGS科学研究和工程应用提供了重要的参考。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2021年第12期|121755.1-121755.12|共12页
  • 作者

    Gaosheng Wang; Xianzhi Song; Guofeng Song; Yu Shi; Chao Yu; Fuqiang Xu; Jiayan Ji; Zihao Song;

  • 作者单位

    State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum Beijing Beijing 102249 China;

    State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum Beijing Beijing 102249 China;

    State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum Beijing Beijing 102249 China;

    School of Geosciences and Environmental Engineering Southwest Jiaotong University Chengdu 611756 China;

    State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum Beijing Beijing 102249 China;

    State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum Beijing Beijing 102249 China;

    State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum Beijing Beijing 102249 China;

    State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum Beijing Beijing 102249 China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Geothermal energy; Hydrothermal resource; Horizontal well; Closed-loop; Thermal characteristics; Forced and natural convection;

    机译：地热能;水热资源;水平井;闭环;热特性;强迫自然对流;

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