Article
Energy & Fuels
Sangdon Lee, Wisup Bae, Asep K. Permadi, Changhyup Park
Summary: This paper discusses a case study on the enhanced geothermal system (EGS), which involves a hydraulic stimulation at Patuha geothermal field, West Java, Indonesia. The water injection conducted in three phases effectively raised the bottom hole pressure and positively influenced formation. The research showed that the hydraulic stimulation increased steam production up to 11.4% in nearby production wells.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2023)
Article
Geochemistry & Geophysics
Alfio Vigano, Giorgio Ranalli, Daniele Andreis, Silvana Martin
Summary: The friction coefficient is an important parameter for describing the strength of seismic faults, and it is related to the properties of rocks and pore fluid pressures. By using an iterative inversion procedure and analyzing datasets, the average static friction coefficient of seismic faults can be obtained, which is crucial for further understanding the behavior and stability models of seismic faults.
JOURNAL OF GEODYNAMICS
(2021)
Article
Geochemistry & Geophysics
Barnaby Fryer, Mathias Lebihain, Marie Violay
Summary: This paper proposes a new stimulation technique for Enhanced Geothermal Systems (EGSs) to reduce the likelihood of induced seismicity. By pre-conditioning the stress state through fluid production, potential nucleation and rupture events can be suppressed or halted. Laboratory-scale and meso-scale testing are recommended to further investigate the applicability of this methodology.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Environmental Sciences
Sandro Andres, David Santillan, Juan Carlos Mosquera, Luis Cueto-Felgueroso
Summary: Enhanced Geothermal Systems (EGS) can promote sustainable development by providing a green energy supply. However, hydraulic stimulation is often required to improve fluid flow and energy efficiency. This study uses numerical simulations to evaluate the seismic risk associated with hydraulic stimulation and finds that it is not only related to induced seismicity but can also cause a decline in reservoir temperature.
Article
Energy & Fuels
Li Ma, Zhenpeng Cui, Bo Feng, Xiaofei Qi, Yuandong Zhao, Chaoyu Zhang
Summary: A reactive solute transport model was established using TOUGHREACT to investigate the effect of chemical stimulation on the reconstruction of a granite-hosted enhanced geothermal system reservoir. The results showed that chemical stimulation with mud acid improved the permeability of fractures near the injection well, with an effective penetration distance of over 20 m after 5 days. The enhancement of porosity and permeability was mainly due to the dissolution of feldspar and chlorite. The method of chemical enhancement can serve as a reference for future enhanced geothermal system engineering designs.
Article
Green & Sustainable Science & Technology
Yu Zhang, Yanjun Zhang, Ling Zhou, Zhihong Lei, Liangliang Guo, Jian Zhou
Summary: The study indicates that gel-proppant hydraulic fracturing and a two-horizontal-well system prove feasible for the granodiorite reservoir in the ZR2 well at the Zhacang geothermal field, China. These methods can optimize reservoir stimulation, reduce greenhouse gas emissions, lower the cost of electricity, and show significant development potential from an economic perspective.
Article
Geochemistry & Geophysics
Nitin Sharma, Vincenzo Convertito, Raffaella De Matteis, Paolo Capuano
Summary: This study aims to develop ground-motion prediction equations (GMPEs) specifically for induced earthquakes in the St. Gallen geothermal area, Switzerland. The data analysis includes 343 earthquakes, and GMPEs are inferred using a two-phase approach. The comparison with GMPEs from other regions highlights the importance of using region-specific GMPEs for accurate assessment of induced seismic hazards.
JOURNAL OF GEOPHYSICS AND ENGINEERING
(2022)
Article
Energy & Fuels
Michal Kruszewski, Hannes Hofmann, Fidel Gomez Alvarez, Caterina Bianco, Adrian Jimenez Haro, Victor Hugo Garduno, Domenico Liotta, Eugenio Trumpy, Andrea Brogi, Walter Wheeler, Eivind Bastesen, Francesco Parisio, Erik H. Saenger
Summary: Data from exploration wells in Acoculco caldera showed high temperatures suitable for economic utilization, but lacking permeability, necessitating Enhanced Geothermal System (EGS) technologies. Research findings on the in-situ stress field conditions are crucial for stimulation planning in this geothermal area.
Article
Energy & Fuels
Ilmo T. Kukkonen, Pekka J. Heikkinen, Peter E. Malin, Joerg Renner, Georg Dresen, Aino Karjalainen, Jussi Rytkonen, Juha Solantie
Summary: In this study, hydraulic stimulation data from the St1 Deep Heat Project in southern Finland were analyzed to evaluate the conditions for an Enhanced Geothermal System. The results show that hydraulic conductivity in the soil is pressure-dependent, heterogeneously distributed, and affected by fractures and lithological variation. Although stimulation temporarily increased conductivity, it gradually returned to the natural level after pressure release. The project provided valuable experience and data on deep drilling, hydrogeological properties, and seismic response to stimulation of crystalline rock.
Article
Energy & Fuels
Linmao Xie, Ki-Bok Min
Summary: The conventional single stage hydraulic stimulation may lead to slip concentration on fractures, while the multi-stage stimulation strategy can develop slip zones on multiple fractures, effectively reducing the possible maximum seismic event magnitude.
Article
Thermodynamics
Zhibin Li, Wenbo Huang, Juanwen Chen, Jiwen Cen, Wenjiong Cao, Feng Li, Fangming Jiang
Summary: A novel enhanced super-long heat pipe system (ESLHPS) is proposed to improve the heat transfer rate and thermal performance of the super-long gravity heat pipe (SLGHP) in a single-well geothermal system. An insulation layer is set around the heat pipe to reduce heat loss. The thermal performance of the ESLHPS is found to be dependent on the thermal conductivity, length, and radius of the heat transfer enhanced region.
Article
Thermodynamics
Xianbiao Bu, Zhipeng Guo, Lingbao Wang
Summary: The proposed SDEGS enhances geothermal energy extraction by fracturing low yield hydrothermal systems to increase permeability and volume flow rate. With the ability to adjust volume flow rate and injection water temperature, it can provide heating for buildings and meet thermal load requirements under different outdoor ambient temperatures, promoting rapid development of geothermal energy and effectively solving the smog problem.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Environmental Sciences
Han-Sun Ryu, Heejung Kim, Jin-Yong Lee, Dugin Kaown, Kang-Kun Lee
Summary: This study examined the changes in groundwater levels, water temperatures, and microbial communities of geothermal wells before and after earthquakes, particularly focusing on well PX-2, which showed a closer relationship with seismic activity and requires continuous monitoring until at least June 2024.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Energy & Fuels
Art McGarr, Ernest L. Majer
Summary: Understanding the cause of the November 2017 Pohang main shock is important for the future of the geothermal industry. Induced possibility can be ruled out, and the seismic hazard source at Pohang was tectonic strain accumulation. The most timely indicator was the September 2016 Gyeongju earthquake.
Review
Green & Sustainable Science & Technology
S. Li, S. Wang, H. Tang
Summary: This work provides a comprehensive review of fracture stimulation in enhanced geothermal systems, including hydraulic stimulation mechanisms, design strategies, and measurement tools. It compares the impacts of different hydraulic stimulation mechanisms on the performance of enhanced geothermal systems and analyzes the hydraulic stimulation design strategies in 19 representative projects worldwide. The difference between hydraulic stimulation operations in geothermal reservoirs and those in oil/gas fields is clarified, aiming to provide useful guidelines for both theoretical research and field operations.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2022)
