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Processes 2019, 7(4), 202; https://doi.org/10.3390/pr7040202

Numerical Investigation of Influence of Reservoir Heterogeneity on Electricity Generation Performance of Enhanced Geothermal System

1
School of Earth Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China
2
Guangdong Provincial Key Laboratory of Mineral Resources & Geological Processes, Guangzhou 510275, China
3
Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China
4
Qingdao Institute of Marine Geology, China Geological Survey, Qingdao 266071, China
*
Author to whom correspondence should be addressed.
Received: 22 February 2019 / Revised: 3 April 2019 / Accepted: 5 April 2019 / Published: 9 April 2019
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Abstract

The enhanced geothermal system (EGS) reservoir consists of a heterogeneous fracture network and rock matrix, and the heterogeneity of the reservoir has a significant influence on the system’s electricity generation performance. In this study, we numerically investigated the influence of reservoir heterogeneity on system production performance based on geological data from the Gonghe Basin geothermal field, and analyzed the main factors affecting production performance. The results show that with the increase of reservoir heterogeneity, the water conduction ability of the reservoir gradually reduces, the water production rate slowly decreases, and this causes the electric power to gradually reduce, the reservoir impedance to gradually increase, the pump power to gradually decrease and the energy efficiency to gradually increase. The fracture spacing, well spacing and injection temperature all have a significant influence on electricity generation performance. Increasing the fracture spacing will significantly reduce electric power, while having only a very slight effect on reservoir impedance and pump power, thus significantly decreasing energy efficiency. Increasing the well spacing will significantly increase the electric power, while having only a very slight effect on the reservoir impedance and pump power, thus significantly increasing energy efficiency. Increasing the injection temperature will obviously reduce the electric power, decrease the reservoir impedance and pump power, and thus reduce energy efficiency. View Full-Text
Keywords: reservoir heterogeneity; enhanced geothermal system; electricity generation; performance; influence reservoir heterogeneity; enhanced geothermal system; electricity generation; performance; influence
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Zeng, Y.; Tang, L.; Wu, N.; Song, J.; Zhao, Z. Numerical Investigation of Influence of Reservoir Heterogeneity on Electricity Generation Performance of Enhanced Geothermal System. Processes 2019, 7, 202.

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