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Original Article | Open Access

Comparison of multi-field coupling numerical simulation in hot dry rock thermal exploitation of enhanced geothermal systems

Shichao Chen1, Bin Ding1, Liang Gong1 ( ), Zhaoqin Huang2, Bo Yu3, Shuyu Sun4
College of New Energy, China University of Petroleum (East China), Qingdao 266580, P. R. China
School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, P. R. China
Beijing Key Laboratory of Pipeline Critical Technology and Equipment for Deepwater Oil and Gas Development, Beijing Institute of Petrochemical Technology, Beijing 102617, P. R. China
Computational Transport Phenomena Laboratory (CTPL), King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Kingdom of Saudi Arabia
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Abstract

In order to alleviate the environmental crisis and improve energy structure, countries from all over the world have focused on the hot dry rock geothermal resources with great potential and with little pollution. The geothermal heat production from enhanced geothermal system comes with complex multi-field coupling process, and it is of great significance to study the temporal and spatial evolution of geothermal reservoir. In this work, a practical numerical model is established to simulate the heat production process in EGS, and the comparison of thermal-hydraulic (TH), thermal-hydraulic-mechanical (THM) and thermal-hydraulic-mechanical-chemical (THMC) coupling in geothermal reservoir is analyzed. The results show that the stable production stage of the three cases is approximately 5 years; however, compared with TH and THMC coupling, the service-life for THM coupling decreased by 1140 days and 332 days, respectively. The mechanical enhanced effects are offset by the chemical precipitation, and the precipitation from SiO 2 is much larger than the dissolution of calcite.

Keywords

Numerical simulationTH couplingTHM couplingTHMC couplingcomparative analysis

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Advances in Geo-Energy Research
Volume 3 Issue 4,
December 2019
Pages 396-409
DOI: 10.26804/ager.2019.04.07
Cite this article:
Chen S, Ding B, Gong L, et al. Comparison of multi-field coupling numerical simulation in hot dry rock thermal exploitation of enhanced geothermal systems. Advances in Geo-Energy Research, 2019, 3(4): 396-409. https://doi.org/10.26804/ager.2019.04.07

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Received: 01 December 2019
Revised: 12 December 2019
Accepted: 12 December 2019
Published: 14 December 2019
© The Author(s) 2019

This article is distributed under the terms and conditions of the Creative Commons Attribution (CC BY-NC-ND) license, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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