Дисертації з теми "Enhanced geothermal systems"
Оформте джерело за APA, MLA, Chicago, Harvard та іншими стилями
Ознайомтеся з топ-16 дисертацій для дослідження на тему "Enhanced geothermal systems".
Біля кожної праці в переліку літератури доступна кнопка «Додати до бібліографії». Скористайтеся нею – і ми автоматично оформимо бібліографічне посилання на обрану працю в потрібному вам стилі цитування: APA, MLA, «Гарвард», «Чикаго», «Ванкувер» тощо.
Також ви можете завантажити повний текст наукової публікації у форматі «.pdf» та прочитати онлайн анотацію до роботи, якщо відповідні параметри наявні в метаданих.
Переглядайте дисертації для різних дисциплін та оформлюйте правильно вашу бібліографію.
De, Simone Silvia. "Induced seismicity in enhanced geothermal systems : assessment of thermo-hydro-mechanical effects." Doctoral thesis, Universitat Politècnica de Catalunya, 2017. http://hdl.handle.net/10803/405890.
Повний текст джерелаLa micro-sismicitat induïda per operacions relacionades amb els Sistemes Geotèrmics Estimulats ha originat un gran interès científic, no només pel risc i la preocupació que comporta, sinó també perquè la relació entre la injecció de fluids i l'activitat sísmica no s'entén completament. Aquesta tesi pretén avançar en la comprensió dels processos hidro-termo-mecànics (THM) que causen aquesta sismicitat, per poder explicar-la i gestionar-la. En primer lloc, hem investigat l'acoblament hidro-mecànic (HM) i el seu efecte sobre les pressions. En Hidrologia Subterrània clàssica l'emmagatzematge especifico expressa la capacitat de l'aqüífer de deformar-se després d'una variació de pressió. Malgrat això, la sobrepressió generada per la injecció exerceix una força que deforma tot l'aqüífer, depenent de la seva geometria i de les formacions adjacents. Per això, l'emmagatzematge no es pot expressar amb un sol paràmetre, sinó que depèn de la resposta poro-elàstica de tot l'aqüífer, per la qual cosa diem que l'emmagatzematge específic és "no-local", cosa que vam mostrar mitjançant solucions analítiques de la resposta transitòria al problema HM de la injecció en aqüífers de dimensió finita, amb geometria tant unidimensional com cilíndrica. Seguidament, hem considerat una injecció no isoterma i comparat els efectes de l'acoblament hidro-mecànic (HM) i termo-mecànic (TM). Hem obtingut expressions analítiques per a les tensions i els desplaçaments induïts a llarg termini per la pertorbació hidràulica i tèrmica, en el cas de dominis unidireccional i radial. Per a això, hem considerat flux estacionari i desenvolupat una solució analítica senzilla per al transport de calor en règim transitori, la qual cosa ens ha permès calcular la resposta poro i termo-elàstica i en particular la sensibilitat de les tensions a les condicions mecàniques en el contorn exterior. A continuació, hem desenvolupat simulacions HM i THM acoblades de la injecció d'aigua freda en un sistema format per una falla embeguda en una roca intacta, a fi d'analitzar les variacions de l'estabilitat mecànica durant la injecció. Les simulacions HM mostren que l'estabilitat de les fractures depèn de la seva orientació i del tensor de tensions inicial. Concloem que la reducció de temperatura provoca prop del pou una forta pertorbació de les tensions, que pot induir sismes en fractures orientades críticament, especialment quan la tensió màxima actua perpendicularment a la fractura. Finalment, hem estudiat els mecanismes que poden induir sismes quan s'atura la injecció de fluids en sistemes geotèrmics profunds (sismicitat post-injecció). A més de l'efecte directe de l'augment de la pressió, hem considerat l'efecte tèrmic a causa del refredament i la redistribució de tensions generada pel moviment de cisalla que ocorre durant la injecció en fractures favorablement orientades. Aquests efectes s'han analitzat tant per separat com superposats. Dels resultats podem deduir que la sismicitat post-injecció pot ocórrer al llarg de fractures que eren inicialment estables i es desestabilitzen durant la injecció, a causa de les tensions tèrmiques i a les induïdes per la cisalla, però es mantenen estables gràcies a les forces de pressió. Posteriorment, aquestes fractures trenquen quan s'interromp la injecció, ja que les pressions es dissipen ràpidament. Això suggereix que la sismicitat post-injecció pot atenuar-se amb una reducció lenta del cabal d'injecció.
Peluchette, Jason. "Optimization of Integrated Reservoir, Wellbore, and Power Plant Models for Enhanced Geothermal Systems." Thesis, West Virginia University, 2013. http://pqdtopen.proquest.com/#viewpdf?dispub=1524651.
Повний текст джерелаGeothermal energy has the potential to become a substantially greater contributor to the U.S. energy market. An adequate investment in Enhanced Geothermal Systems (EGS) technology will be necessary in order to realize the potential of geothermal energy. This study presents an optimization of a waterbased Enhanced Geothermal System (EGS) modeled for AltaRock Energy’s Newberry EGS Demonstration location. The optimization successfully integrates all three components of the geothermal system: (1) the present wellbore design, (2) the reservoir design, and (3) the surface plant design.
Since the Newberry EGS Demonstration will use an existing well (NWG 55-29), there is no optimization of the wellbore design, and the aim of the study for this component is to replicate the present wellbore conditions and design. An in-house wellbore model is used to accurately reflect the temperature and pressure changes that occur in the wellbore fluid and the surrounding casing, cement, and earth during injection and production. For the reservoir design, the existing conditions, such as temperature and pressure at depth and rock density, are incorporated into the model, and several design variables are investigated. The engineered reservoir is modeled using the reservoir simulator TOUGH2 while using the graphical interface PetraSim for visualization. Several fracture networks are investigated with the goal of determining which fracture network yields the greatest electrical output when optimized jointly with the surface plant. A topological optimization of the surface is completed to determine what type of power plant is best suited for this location, and a parametric optimization of the surface plant is completed to determine the optimal operating conditions.
The conditions present at the Newberry, Oregon EGS project site are the basis for this optimization. The subsurface conditions are favorable for the production of electricity from geothermal energy with rock temperatures exceeding 300°C at a well depth of 3 km. This research was completed in collaboration with AltaRock Energy, which has provided our research group with data from the Newberry well. The purpose of this thesis is to determine the optimal conditions for operating an Enhanced Geothermal System for the production of electricity at Newberry.
It was determined that a fracture network consisting of five fractured zones carrying 15 kg/s of fluid is the best reservoir design out of those investigated in this study. Also, it was found that 100 m spacing between the fractured zones should be implemented as opposed to only 50 m of spacing. A double-flash steam power plant provides the best method of utilization of the geothermal fluid. For the maximum amount of electricity generation over the 30-year operating lifetime, the cyclone separator should operate at 205°C and the flash vessel should operate at 125°C.
Vecchiarelli, Alessandra. "Application of the 3-D Hydro-Mechanical Model GEOFRAC in enhanced geothermal systems." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/82857.
Повний текст джерелаCataloged from PDF version of thesis.
Includes bibliographical references (pages 167-171).
GEOFRAC is a three-dimensional, geology-based, geometric-mechanical, hierarchical, 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 developments in GEOFRAC allow the user to calculate the flow in a fractured medium. For this purpose the fractures are modeled as parallel plates and the flow rate can be calculated using the Poisseuille equation. This thesis explores the possibility of the application of GEOFRAC to model a geothermal reservoir. After modeling the fracture flow system of the reservoir, it is possible to obtain the production flow rate. A parametric study was conducted in order to check the sensitivity of the output of the model. An attempt to explain how aperture, width and rotation (orientation distribution) of the fractures influence the resulting flow rate in the production well is presented. GEOFRAC is a structured MATLAB code composed of more than 100 functions. A GUI was created in order to make GEOFRAC more accessible to the users. Future improvements are the keys for a powerful tool that will let GEOFRAC to be used to optimize the location of the injection and production wells in a geothermal system.
by Alessandra Vecchiarelli.
S.M.
Lacirignola, Martino. "Life cycle assessment of enhanced geothermal systems : from specific case studies to generic parameterized models." Thesis, Paris, CNAM, 2017. http://www.theses.fr/2017CNAM1095/document.
Повний текст джерелаThis thesis investigates the environmental impacts of an emerging renewable energy technology, the enhanced geothermal systems (EGS), using a life cycle assessment (LCA) approach.Following the analysis of several EGS case studies, we developed a parameterized LCA model able to provide a global overview of the life cycle impacts of the EGS technology. The greenhouse gas emissions of EGS are found comparable with other renewable energy systems and far better than those of power plants based on fossil fuels.In a second stage, we developed a methodological framework for the application of global sensitivity analysis (GSA) to the LCA of emerging technologies like the EGS, taking into account the high uncertainties related to their description. We applied our new GSA approach to generate a simplified LCA model, aimed at decision makers, allowing a rapid estimation of the life cycle impacts of EGS from only five key parameters: installed capacity, drilling depth, number of wells, flow rate and lifetime.The methodological approach developed in this thesis is applicable to other technologies and opens large research perspectives in the field of environmental assessment
Yekoladio, Peni Junior. "Thermodynamic optimization of sustainable energy system : application to the optimal design of heat exchangers for geothermal power systems." Diss., University of Pretoria, 2013. http://hdl.handle.net/2263/31615.
Повний текст джерелаDissertation (MEng)--University of Pretoria, 2013.
Mechanical and Aeronautical Engineering
unrestricted
Howard, Panit. "High Temperature Seismic Monitoring for Enhanced Geothermal Systems - Implementing a Control Feedback Loop to a Prototype Tool by Sandia National Laboratories." Thesis, Virginia Tech, 2012. http://hdl.handle.net/10919/32891.
Повний текст джерелаMaster of Science
Köpke, Rike [Verfasser], T. [Akademischer Betreuer] Kohl, and J. [Akademischer Betreuer] Schmittbuhl. "Fracture network characterization in enhanced geothermal systems by induced seismicity analysis / Rike Köpke ; T. Kohl, J. Schmittbuhl." Karlsruhe : KIT-Bibliothek, 2021. http://nbn-resolving.de/urn:nbn:de:101:1-2021092905002801218956.
Повний текст джерелаKoch, David [Verfasser], and Wolfgang [Akademischer Betreuer] Ehlers. "Thermomechanical modelling of non-isothermal porous materials with application to enhanced geothermal systems / David Koch ; Betreuer: Wolfgang Ehlers." Stuttgart : Universitätsbibliothek der Universität Stuttgart, 2016. http://d-nb.info/1132583152/34.
Повний текст джерелаFiroozy, Niloofar. "Assessment of geothermal application for electricity production from the prairie evaporite formation of Williston Basin in South-West Manitoba." 13th International UFZ-Deltares Conference on Sustainable Use and Management of Soil, Sediment and Water Resources, 2015. http://hdl.handle.net/1993/31898.
Повний текст джерелаFebruary 2017
McClure, Mark W. "Fracture stimulation in enhanced geothermal systems /." 2009. http://pangea.stanford.edu/ERE/db/pereports/record_detail.php?filename=mcclure09.pdf.
Повний текст джерелаPeacock, Jared Roy. "Magnetotelluric monitoring." Thesis, 2012. http://hdl.handle.net/2440/96465.
Повний текст джерелаThesis (Ph.D.) -- University of Adelaide, School of Earth and Environment Sciences, 2012
Kuncoro, Gideon Bani. "Fluid-rock interaction studies on an enhanced geothermal system in the Cooper Basin, South Australia." Thesis, 2015. http://hdl.handle.net/2440/92215.
Повний текст джерелаThesis (Ph.D.) -- University of Adelaide, School of Chemical Engineering, 2015
Ramos, Norberto Carlos Martins Madeira. "Viabilidade dos sistemas geotérmicos estimulados para a produção de energia eléctrica em Portugal." Master's thesis, 2014. http://hdl.handle.net/10316/38893.
Повний текст джерелаTradicionalmente, o aproveitamento da energia geotérmica para produção de energia eléctrica limitava-se a locais onde o vapor e/ou as águas muito quentes emergiam à superfície. Recentemente, com o avanço da tecnologia começaram-se a desenvolver-se novos sistemas de captação desta energia tendo surgido os sistemas geotérmicos estimulados (SGE) que permitem produzir energia eléctrica em qualquer parte do mundo, mesmo em locais com baixas entalpias. A aplicação de um SGE torna-se assim numa excelente oportunidade para produção de energia eléctrica, na Região Centro de Portugal, local dominado por baixas entalpias. Ao longo desta dissertação, procura-se analisar os custos associados a estes sistemas e avaliar a influência das variáveis chave, como a profundidade, o gradiente de temperatura do solo em profundidade e o caudal na viabilidade económica da instalação de um SGE nesta região. Neste estudo é testada a viabilidade de cinco profundidades (3,0; 3,5; 4,0; 4,5 e 5,0 km) para implantação de um SGE. Para cada uma das profundidades são assumidas quatro variações de temperatura por quilómetro de profundidade (30; 35; 40 e 45 ºC/km) e um caudal de 30 L/s. Através de pressupostos técnicos, económicos e financeiros, é determinada a viabilidade da aplicação de um sistema geotérmico estimulado na Região Centro de Portugal. Concluiu-se que as situações com maior rentabilidade económica estão associadas aos maiores aumentos da temperatura com a profundidade. Assumindo uma tarifa líquida de 0,25 €/kWh e que são rentáveis os investimentos com um Período de Retorno (PR) inferior a 15 anos, afiguram-se como viáveis as situações com gradientes de temperatura superiores a 35 ºC/km para uma profundidade de 5,0 km, com gradientes a partir dos 40 ºC/km para furos de 4,5 km e acima de 45 ºC/km para profundidades iguais ou superiores a 3,5 km. Não é viável instalar um SGE em locais com gradientes de temperatura inferiores a 35 ºC/km. O recurso a profundidades inferiores a 3,5 km só será eventualmente viável para gradientes de temperatura superiores a 50 ºC/km, mas este caso não foi analisado no decurso deste trabalho.
Traditionally, the exploitation of geothermal energy for electrical energy production was limited to areas where steam and/or hot water emerged to the surface. Recently, with the technological advancements new systems of energy collection started to appear, having emerged the enhanced geothermal systems (EGS), which allow the production of electrical energy in any part of the world, even in areas with low enthalpy. The application of an EGS becomes an excellent opportunity for production of electrical energy, in Central Region of Portugal, an area dominated by low enthalpy. This dissertation aims to analyze the costs associated with these systems and evaluate the influence of the key variables, such as depth, gradient of soil temperature in depth and flow rate on the economic feasibility of installing an EGS in this region. This study tests the feasibility of five different depths (3,0; 3,5; 4,0; 4,5 e 5,0 km) for the implementation of an EGS. For each of the different depths are assumed four in-depth temperature gradients (30; 35; 40 e 45 ºC/km) and a flow rate of 30 L/s. Through technical, economic and financial assumptions, the feasibility of the application of an EGS in the central region of Portugal is assessed. It was concluded that situations with higher economical profitability are associated to the largest increases of temperature with depth. Assuming a net rate of 0,25 €/kWh and that investments with a Return Period (RP) under 15 years are profitable, it is predicted to be feasible in situations with temperature gradients above at 35 ºC/km to a depth 5,0 km, with gradients from 40 ºC/km and holes of 4,5 km, and greater than or equal gradients at 45 ºC/km to depth 3,5 km. It is not feasible to install an EGS in places with temperature gradients of less than 35 °C/km. The use of less than 3,5 km of depth is eventually viable for gradients exceeding 50 °C/km temperature, although this case was not examined during this study.
Soeffky, P. "Delineating the deep crustal fluid link between the Paralana Enhanced Geothermal System and the Beverley Uranium Mine using magnetotellurics." Thesis, 2012. http://hdl.handle.net/2440/95486.
Повний текст джерелаThe global demand for clean energy alternatives is constantly increasing, creating significant interest for more sustainable energy resources such as uranium and geothermal. Australia is host to over 25% of the world's known uranium resources as well as having significant geothermal potential. The Mount Painter Domain, in the Northern Flinders Ranges in South Australia, is in a region of anomalously high heat flow generated by radiogenic decay of uranium and thorium rich granites. Two distinct uranium deposits have formed from dissolved uranium carried from the ranges by fluids, being deposited where reduction in sediment pH precipitates uranium. In May 2012 a magnetotelluric profile was collected, extending from the Northern Flinders Ranges to the Lake Frome embayment to help constrain existing resistivity models. Precipitation of uranium at the Beverley Mine site is anomalous as no surface water flow is present, suggesting the presence of subsurface processes. This pathway is linked to a 50m conductive body at the brittle-ductile boundary of the mid-crust, directly under the Paralana geothermal prospect. 3D modelling of the Paralana geothermal prospect suggests deep conductive features connecting with features at the surface.
Thesis (B.Sc.(Hons)) -- University of Adelaide, School of Earth and Environmental Sciences, 2012
Thoram, Srikanth. "Heat Transfer Applications for the Stimulated Reservoir Volume." Thesis, 2011. http://hdl.handle.net/1969.1/ETD-TAMU-2011-08-9931.
Повний текст джерелаLee, Byungtark. "Numerical Investigation of Fractured Reservoir Response to Injection/Extraction Using a Fully Coupled Displacement Discontinuity Method." Thesis, 2011. http://hdl.handle.net/1969.1/ETD-TAMU-2011-08-10100.
Повний текст джерела