Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 23 for “"enhanced geothermal systems"”.
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Numerical Model Studies of Enhanced Geothermal Systems
Enhanced Geothermal Systems (EGS) are being developed around the world as a method of extraction of thermal energy. A good EGS reservoir should maintain a small thermal drawdown and low water loss. All factors must be considered for optimal levels of energy production and assuring a long life span …
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Nitrous oxide as working fluid in enhanced geothermal systems (EGS)
La energía geotérmica es una fuente de energía renovable que se puede encontrar en abundancia en nuestro planeta. Solo una pequeña fracción de esta se convierte actualmente en energía eléctrica, aunque en los últimos años la capacidad geotérmica instalada ha aumentado considerablemente en todo el …
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Feasibility study of sedimentary enhanced geothermal systems using reservoir simulation
… the preliminary feasibility of commercial geothermal projects, from a sedimentary reservoir with low permeability that requires productivity enhancement, using numerical reservoir simulation. The performance of a sedimentary geothermal reservoir is investigated in terms of reservoir …
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Thermomechanical analysis of rock asperity in fractures of enhanced geothermal systems
<p>"Enhanced Geothermal Systems (EGS) offer great potential for dramatically expanding the use of geothermal energy and become a promising supplement for fossil energy. The EGS is to extract heat by creating a subsurface system to which cold water can be added through injection wells. Injected …
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Application of the 3-D Hydro-Mechanical Model GEOFRAC in enhanced geothermal systems
… stochastic model of natural rock fracture systems. The main characteristic of GEOFRAC is that it is based on statistical input representing fracture patterns in the field in form of the fracture intensity P₃₂ (fracture area per volume) and the best estimate fracture size E[A]. Recent …
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A Comparative Case Study of Enhanced Geothermal Systems: Interacting Imaginaries of Place and Energy in Renewable Energy Transitions
… and cultural forces that shape both our energy systems and responses to efforts to change those systems. Public responses to new clean energy technologies, including negotiations of the risk and acceptability of local projects, can be critical to the success or failure of such technologies. …
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Understanding the Relationship between Hydraulic Properties of Rocks and Induced Seismicity in the Stimulation of Enhanced Geothermal Systems
… of numerical models to gain insight on Enhanced Geothermal System (EGS) stimulation operations. These operations consist of high pressure injection of cold water in low permeability formations at depth of 2-4 kilometres, promoting the opening of existing fractures and creating an …
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Interplay of porous media and fracture stimulation in sedimentary enhanced geothermal systems : Red River Formation, Williston Basin, North Dakota
Fracture stimulated enhanced geothermal systems (EGS) can be installed in both crystalline rocks and sedimentary basins. The Red River Formation (Ordovician), which lies between 3.6 and 4.2 km depth in the Williston Basin, is a viable site for installation of sedimentary EGS (SEGS). SEGS is …
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High Temperature Seismic Monitoring for Enhanced Geothermal Systems - Implementing a Control Feedback Loop to a Prototype Tool by Sandia National Laboratories
Geothermal energy can make an important contribution to the U.S. energy portfolio. Production areas require seismic monitoring tools to develop and monitor production capability. This paper describes modifications made to a prototypical seismic tool to implement improvements that were identified …
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Geothermal regime of the Williston Basin in North Dakota
… basin such as the Williston Basin can be enhanced by analysis of the relationships among radiogenic heat production, surface heat flow, formation temperatures, and gravity and magnetic anomaly patterns. Digital processing of the spatial and causal relationships gives insight into the …
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Experimental Investigations on Flow and Mass Transport in Stressed Rough Fractures
… development of new energy technologies including enhanced geothermal systems, EGS, and CO2 sequestration. This is a complex problem, mostly due to the number of interacting physical processes in the fractured environment. In this thesis I introduce a novel pressure-controlled Hele-Shaw cell to …
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Decision analysis for geothermal energy
One of the key impediments to the development of enhanced geothermal systems is a deficiency in the tools available to project planners and developers. Weak tool sets make it difficult to accurately estimate the cost and schedule requirements of a proposed geothermal plant, and thus make it more …
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Enhanced geothermal energy and cogeneration : design, technology and economics
… Department of Energy has supported research into Enhanced Geothermal Systems in Hot Dry Rock (HDR) since the mid seventies. Advances in drilling technology, reservoir management and power conversion cycles have all contributed to the further development of HDR geothermal energy schemes. Apart from …
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Acoustic monitoring of hydraulic stimulation in granites
Enhanced Geothermal Systems (EGS) have substantial potential as a domestic energy source and is well suited as an alternative to diversify the national energy portfolio due to its high levels of heat and recoverable energy. Hydraulic fracture stimulation of low permeability EGS reservoir rock is …
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Numerical modeling of cold water injection into supercritical geothermal reservoirs
… exploitation of the Earth’s resources. Geothermal energy is a renewable energy resource found in the reservoirs of high temperature geothermal systems. In broad terms a high temperature geothermal system is comprised of a multitude of processes which redistribute heat and mass via fluid …
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Partitioning of fluid flow along faults and fractures in the Bristol Channel Basin: implications for low carbon geoscience projects in SW England
… fluid<br/>flow in modern reservoirs, such as Enhanced Geothermal Systems (EGS).
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Unified interpretation of nonlinear elasticity in granular solids, A
… oil and gas reservoirs as well as in enhanced geothermal systems.
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Exploration and Production Risk Mitigation for Geothermal Adoption in the Energy Transition
Geothermal provides a continuous, low-emissions source of energy with enormous potential in the United States, both singularly or as part of a broader energy mix. Although a small contributor to the current national energy grid, geothermal electricity generation dates back nearly a century for …
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Mechanisms of Interaction Between Hydraulic and Natural Fractures in Shale Rocks
… is key for optimizing subsurface energy systems that rely on fluid injection into fractured rocks. These include Enhanced Geothermal Systems (EGS), CO₂ sequestration, hydrogen storage in depleted reservoirs, unconventional oil and gas development in shale formations, and nuclear waste …
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Mathematical and Computational Modeling of Injection-induced Seismicity
… wastewater disposal, natural gas storage, enhanced geothermal systems, and hydraulic fracturing. As a result, there has been a growing public concern around the world about the potential seismic hazard and environmental impact of subsurface energy technologies. Understanding the physical …
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