scholarly journals An analysis of thermodynamic properties in both traditional and enhanced geothermal systems to compare thermal efficiencies

2017 ◽  
Vol 4 ◽  
pp. 103-120
Author(s):  
Samuel Peter Martin ◽  
Alexander Richmond Perry ◽  
Kirill Lushnikov
Keyword(s):  
Energy Source ◽  
Renewable Energy Source ◽  
Geothermal Energy ◽  
Energy Production ◽  
Enhanced Geothermal Systems ◽  
System Efficiency ◽  
Geothermal Systems ◽  
Average Efficiency ◽  
Naturally Occurring ◽  
Geothermal Environments

This meta-study draws upon previous research on both Enhanced Geothermal Systems (EGS) and traditional geothermal systems (GS), using these findings to compare and investigate the thermal efficiency of each system. Efficiency calculations include reservoir enthalpy, maximum drilling well temperature, power output (per unit mass of liquid) and mass flow rate of these systems to determine whether EGS’s are viable as an alternative, more readily available renewable energy source. This meta-study suggests that EGS are more viable than naturally occurring GS in the context of future geothermal energy production as they perform with a similar average efficiency of 10-15% and, in addition, can be used in a wider range of geothermal environments.

scholarly journals Numerical simulation of hydraulic fracturing in enhanced geothermal systems considering thermal stress cracks

2021 ◽  
Author(s):  
Ziyang Zhou ◽  
Hitoshi MIKADA ◽  
Junichi TAKEKAWA ◽  
Shibo Xu
Keyword(s):  
Thermal Stress ◽  
High Temperature ◽  
Hydraulic Fracturing ◽  
Geothermal Energy ◽  
Confining Pressure ◽  
Numerical Results ◽  
Enhanced Geothermal Systems ◽  
Geothermal Systems ◽  
Compression Tests ◽  
High Confining Pressure

Abstract With the increasing attention to clean and economical energy resources, geothermal energy and enhanced geothermal systems (EGS) have gained much importance. For the efficient development of deep geothermal reservoirs, it is crucial to understand the mechanical behavior of reservoir rock and its interaction with injected fluid under high temperature and high confining pressure environments. In the present study, we develop a novel numerical scheme based on the distinct element method (DEM) to simulate the failure behavior of rock by considering the influence of thermal stress cracks and high confining pressure for EGS. We validated the proposing method by comparing our numerical results with experimental laboratory results of uniaxial compression tests under various temperatures and biaxial compression tests under different confining pressure regarding failure patterns and stress-strain curves. We then apply the developed scheme to the hydraulic fracturing simulations under various temperatures, confining pressure, and injection fluid conditions. Our numerical results indicate that the number of hydraulic cracks is proportional to the temperature. At a high temperature and low confining pressure environment, a complex crack network with large crack width can be observed, whereas the generation of the micro cracks is suppressed in high confining pressure conditions. In addition, high-viscosity injection fluid tends to induce more hydraulic fractures. Since the fracture network in the geothermal reservoir is an essential factor for the efficient production of geothermal energy, the combination of the above factors should be considered in hydraulic fracturing treatment in EGS.

Overview of Opportunities and Challenges of Electrical Submersible Pumps ESP in the Geothermal Energy Production Systems

2021 ◽  
Author(s):  
Pejman Shoeibi Omrani ◽  
Kaj Van der Valk ◽  
Wim Bos ◽  
Eduard Nizamutdinov ◽  
Laurens Van der Sluijs ◽  
...  
Keyword(s):  
Geothermal Energy ◽  
Energy Production ◽  
Production Systems ◽  
Submersible Pump ◽  
Geothermal Systems ◽  
Geothermal Brine ◽  
Electrical Submersible Pumps ◽  
Geothermal Wells ◽  
Electrical Submersible Pump ◽  
System Designs

Abstract The electrical submersible pump (ESP) is an essential and critical component in most low-enthalpy geothermal wells where high volumes of hot (up to 120°C) and harsh geothermal brine is required to be transported to the surface. Despite a great deal of knowledge and experience in the design and operation of ESP in the petroleum and water sector, reliability of geothermal ESPs requires further improvement. Frequent failures have been observed that resulted from sub-optimum design, installation and operation of these systems which made the lifetime of them shorter than the expected 5-7 years. In this paper we summarize the typical conditions in low-enthalpy geothermal systems (specifically in the Netherlands) and several observed reliability challenges. Lastly, we will discuss the gaps between the petroleum, water and geothermal practices and identify a list of R&D opportunities to better understand the geothermal ESP failures and improve ESP reliability. Testing ESPs in realistic geothermal conditions and a proper monitoring of the well-ESP system is crucial to improve the reliability of existing ESP designs and can enable the development of new geothermal ESP system designs.

scholarly journals Slates: a potential rock type to extract geothermal energy from the underground?

2020 ◽  
Author(s):  
Johannes Herrmann ◽  
Erik Rybacki ◽  
Wenxia Wang ◽  
Harald Milsch ◽  
Bianca Wagner ◽  
...  
Keyword(s):  
Geothermal Energy ◽  
Rock Type ◽  
Metamorphic Rocks ◽  
Enhanced Geothermal Systems ◽  
Geothermal Systems ◽  
The European Union ◽  
Fracture Permeability ◽  
Horizon 2020 ◽  
Rock Types ◽  
Confining Pressures

<p>Commonly used host rock reservoirs for Enhanced Geothermal Systems (EGS) are composed of granite, as they display highly conductive and sustainable fracture networks after stimulation. However, considering the large amount of metamorphic rocks in Europe’s underground, these rock types may also show a large potential to extract geothermal energy from the subsurface. Within the framework of the European Union’s Horizon 2020 initiative ‘MEET (Multi-Sites EGS Demonstration)’, we are conducting fracture permeability experiments at elevated confining pressures, p<sub>c</sub>, temperatures, T, and differential stresses, </p>

scholarly journals Geothermal Energy R&D: An Overview of the U.S. Department of Energy’s Geothermal Technologies Office

2021 ◽  
Vol 143 (10) ◽  
Author(s):  
Susan G. Hamm ◽  
Arlene Anderson ◽  
Douglas Blankenship ◽  
Lauren W. Boyd ◽  
Elizabeth A. Brown ◽  
...  
Keyword(s):  
United States ◽  
Geothermal Energy ◽  
The United States ◽  
Enhanced Geothermal Systems ◽  
Geothermal Systems ◽  
Geothermal Resources ◽  
Future Directions ◽  
Electricity Grid ◽  
Strategic Goals ◽  
The U.S

Abstract Geothermal energy can provide answers to many of America’s essential energy questions. The United States has tremendous geothermal resources, as illustrated by the results of the DOE GeoVision analysis, but technical and non-technical barriers have historically stood in the way of widespread deployment of geothermal energy. The U.S. Department of Energy’s Geothermal Technologies Office within the Office of Energy Efficiency and Renewable Energy has invested more than $470 million in research and development (R&D) since 2015 to meet its three strategic goals: (1) unlock the potential of enhanced geothermal systems, (2) advance technologies to increase geothermal energy on the U.S. electricity grid, and (3) support R&D to expand geothermal energy opportunities throughout the United States. This paper describes many of those R&D initiatives and outlines future directions in geothermal research.

scholarly journals Effect of Greenhouse Gas Emission on Solar PV Performance

2020 ◽  
Vol 9 (3) ◽  
pp. 3642-3647
Keyword(s):  
Carbon Dioxide ◽  
Energy Source ◽  
Renewable Energy Source ◽  
Renewable Energy ◽  
Energy Production ◽  
Greenhouse Gas Emission ◽  
Carbon Dioxide Emission ◽  
Energy Sector ◽  
Solar Pv ◽  
Gas Emission

Renewable energy is a cleanest and reliable energy sector to the changing climate condition. This changing world needs a quick combination of renewable energy in the energy matrix of each region in such a climate, and it is a sustainable solution. So this study gives a brief idea of how solar photovoltaic (PV) technology performs with changing climatic condition. This system is reliable technology integration in the energy market of India and its statuses among all other renewable sources. To improve energy security and decrease the carbon dioxide emission in an atmosphere, renewable energy technologies have raised a rapid deployment over the past few years. Most of the countries are now changing the ways for economic growth through the development of the renewable energy sector. It is better to Investment in growth of the renewable energy sector because to increase income, to create the job, contribute to industrials development and improve trade balance it is necessary to generate more renewable energy source. The growth in population is directly proportional to energy demand, and again it is directly proportional to energy production due to which the more in carbon dioxide emission. In increasing demand for energy, it is indispensable to produce a renewable energy source, especially in India. Because nowadays solar PV is an excellent source of energy production .so here some study has done about the performance of solar PV on greenhouse gas emission.

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