Performance Study of the Downhole Coaxial Closed-Loop Heat Exchange Technology in Xiong'an New Area

被引：2
|
作者：
Song X. [1 ]
Zhang Y. [1 ]
Li G. [1 ]
Li R. [2 ]
Yu C. [1 ]
Li J. [1 ]
Guo X. [2 ]
机构：
[1] State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum-Beijing, Beijing
[2] Sinopec Star Petroleum Co., Ltd., Beijing
来源：
Tianjin Daxue Xuebao (Ziran Kexue yu Gongcheng Jishu Ban)/Journal of Tianjin University Science and Technology | 2021年 / 54卷 / 09期
基金：
中国国家自然科学基金;
关键词：
Downhole coaxial heat exchanger; Feasibility analysis; Field trial; Geothermal energy; Numerical simulation; Thermal insulation structure;
D O I：
10.11784/tdxbz202007023
中图分类号：
学科分类号：
摘要：
Geothermal energy is a resource-rich, low-cost and widely distributed energy. Xiong'an New Area is rich in geothermal resources and urgently needs efficient heat extraction technology. The downhole coaxial heat exchange technology is suitable for the development of medium-deep geothermal resources with advantages of high heat extraction efficiency and"heat extraction without water extraction". The downhole coaxial heat exchange system consists of a vertical well drilled into the geothermal formation and a central tube in the wellbore in a coaxial position. In this system, the working fluid is injected into the annulus and extracted through the insulated inner tubing, forming a reverse circulation. The working fluid inside the annulus extracts heat via heat convection and heat conduction from the hot wellbore. This paper aims at the geothermal reservoir in Xiong'an New Area and has done the following work. First, the design and development of thermal insulation structure and high thermal conductivity cement was completed. Then, based on the design results, numerical simulations were carried out to study the maximum capacity of the geothermal reservoir, the heat extraction efficiency of the downhole heat exchange system and the influence of key parameters. Finally, a field trial of downhole coaxial heat exchange technology was conducted on the basis of the previous numerical simulation, and a performance study of the downhole coaxial closed-loop heat exchange technology was completed. And a related commercial analysis of different geothermal reservoir conditions and insulation structures was carried out based on the field condition. The research results show that the downhole coaxial heat extraction technology can meet the development needs of mid-deep geothermal energy resources. The designed insulation structure and high thermal conductivity cement have a positive effect on heat extraction. And a set of efficient heat extraction technology system for geothermal well have been formed, which include well structure design, insulation structure design, and development of high-efficiency downhole heat exchangers. © 2021, Editorial Board of Journal of Tianjin University(Science and Technology). All right reserved.
引用
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页码：971 / 981
页数：10
相关论文
共 30 条
  • [1] Liu Xuezhang, Research of Enhancing Heat Transfer in Down-Hole Heat Exchanger by Convective Promoter Pipe, (2012)
  • [2] Liao Zhongli, Zhang Yujie, Chen Wenbin, Et al., Available persist exploitation and utilization of geothermal resources, China Mining Magazine, 10, pp. 8-11, (2006)
  • [3] Acuna J, Mogensen P, Palm B., Evaluation of a coaxial borehole heat exchanger prototype, 2010 the 14th International Heat Transfer Conference, pp. 343-350, (2010)
  • [4] Wood C J, Liu H, Riffat S B., Comparative performance of 'U-tube' and 'coaxial' loop designs for use with a ground source heat pump, Applied Thermal Engineering, 37, 37, pp. 190-195, (2012)
  • [5] Horne R N., Design considerations of a down-hole coaxial geothermal heat exchanger, Geothermal Resources Council Transactions, 4, pp. 569-572, (1980)
  • [6] Morita K, Osamu M, Kusunoki K., Down-hole coaxial heat exchanger using insulated inner pipe for maximum heat extraction, Geothermal Resources Council Transactions, 9, pp. 45-50, (1985)
  • [7] Morita K, Tago M., Development of the downhole coaxial heat exchanger system: Potential for fully utilizing geothermal resources, Geothermal Resources Council Transactions, pp. 83-92, (1995)
  • [8] Beier R A, Acuna J, Mogensen P, Et al., Transient heat transfer in a coaxial borehole heat exchanger, Geothermics, 51, 7, pp. 470-482, (2014)
  • [9] Morita K, Bollmeier W S, Mizogami H., Analysis of the results from the downhole coaxial heat exchanger(DCHE) experiment in Hawaii, Geothermal Resources Council Transactions, 16, pp. 17-23, (1992)
  • [10] Zhao J, Wang H, Li X, Et al., Experimental investigation and theoretical model of heat transfer of saturated soil around coaxial ground coupled heat exchanger, Applied Thermal Engineering, 28, 2, pp. 116-125, (2008)
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