Research progress on heat extraction technology for developing medium-deep geothermal energy

SONG Xianzhi; LI Gensheng; WANG Gaosheng; SHI Yu; YANG Ruiyue

doi:10.3981/j.issn.1000-7857.2022.20.006

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Science & Technology Review ›› 2022, Vol. 40 ›› Issue (20) : 42-51. DOI: 10.3981/j.issn.1000-7857.2022.20.006

Exclusive: Deep geothermal reservoir stimulation technology

Research progress on heat extraction technology for developing medium-deep geothermal energy

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1. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing, Beijing 102249, China;
2. Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 611756, China

Abstract

The medium-deep geothermal energy in China is abundant, with a great potential for development and utilization. To accelerate the exploitation of the medium-deep geothermal energy is important for promoting the rapid development of China's clean heating industry, with a diversified energy supply system and with the goals of the"carbon peaking and carbon neutrality" in the future. In the context of the efficient exploitation of the medium and deep geothermal energy, this paper reviews the researches of the heat extraction technology for exploiting the medium-deep geothermal energy, including various heat extraction technologies based on the doublet-well circulation, the closed-loop circulation in a single well, the circulation in a gravity heat pipe, the open-loop circulation in a single well, the circulation in a U-shaped well and the circulation in a multilateral radial well. The characteristics, the application conditions and the future researches of key heat extraction technologies are analyzed, as well as the development stage and the application scenarios of different heat extraction technologies. The suggestions for efficient exploitation of the medium-deep geothermal energy are proposed.

Key words

medium-deep geothermal energy / heat extraction technology / clean energy

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SONG Xianzhi, LI Gensheng, WANG Gaosheng, SHI Yu, YANG Ruiyue. Research progress on heat extraction technology for developing medium-deep geothermal energy[J]. Science & Technology Review, 2022, 40(20): 42-51 https://doi.org/10.3981/j.issn.1000-7857.2022.20.006

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