Author: Krishna Kumar Kamichetty
Publisher:
ISBN:
Category : Electronic books
Languages : en
Pages : 200
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Book Description
Permeability enhancement during stimulation in a geothermal reservoir is mainly due to the development and extension of pre-existing fractures and joints in the rockmass. The success of this technique is primarily associated with a complex interaction between thermal, hydraulic, mechanical and chemical processes within the rockmass. Various solutions have been developed with the intention of modeling each single process and eventually couple them together in order to predict the resulting permeability and size of the man-created fracture network for given injection rates and rockmass properties. Different combinations of T-H-M-C processes have been studied and are largely based on theoretical frameworks [Taron, et al, 2009]. Most of the T-H-M-C applications occur in the fields of nuclear waste disposal, gas and oil recovery, and Hot Dry Rock Geothermal Systems. In Enhanced Geothermal Systems (EGS), fluid circulation in the fractured rocks is influenced in both the short term and long term by Thermal-Hydro-Mechanical deformation [Elsworth, et al, 2009]. There are many considerations in the design of EGS and most relate to the behavior of fractures. In this work, the Thermal-Hydraulic-Mechanical behavior of the fracture aperture in a Hot Dry Rock Enhanced Geothermal System is studied through numerical simulations of the Fenton Hill model site [Cramer et al, 1979] using a three dimensional distinct element code, 3DEC. A full study of the physical processes involved and their relation with the in-situ geological, structural, mechanical and hydrogeological conditions is a constant and essential component of the work. Different values of input parameters such as Young's modulus, Poisson's ratio, mechanical stresses, thermal load and fluid flow are applied to a planar fracture, and the resultant deformation of the fracture is obtained in the form of displacements. Coupled processes such as coupled T-M and H-M methods are employed and solved for the fracture aperture changes. From the study, it is found which of these individual parameters or coupled processes have significant effect on the fracture aperture change which in turn changes the modeling methods of an Enhanced Geothermal Reservoir. As a result the study offers a reference catalog of guidelines, directions and solutions for future considerations of EGS candidates and demonstrates the capability of the model as an assessment tool for the creation of fractures for an EGS energy recovery project.
Author:
Publisher:
ISBN:
Category : Concord (N.H.)
Languages : en
Pages :
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Author: S. Nemat-Nassar
Publisher: Springer Science & Business Media
ISBN: 9400968841
Category : Science
Languages : en
Pages : 519
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Book Description
Hydraulic fracturing has been and continues to be a major techno logical tool in oil and gas recovery, nuclear and other waste disposal, mining and particularly in-situ coal gasification, and, more recently, in geothermal heat recovery, particularly extracting heat from hot dry rock masses. The understanding of the fracture process under the ac tion of pressurized fluid at various temperatures is of fundamental scientific importance, which requires an adequate description of thermomechanical properties of subsurface rock, fluid-solid interaction effects, as well as degradation of the host rock due to temperature gradients introduced by heat extraction. Considerable progress has been made over the past several years in laboratory experiments, analytical and numerical modeling, and in-situ field studies in various aspects of hydraulic fracturing and geothermal energy extraction, by researchers in the United States and Japan and also elsewhere. However, the results have been scattered throughout the literature. Therefore, the time seemed ripe for bringing together selected researchers from the two countries, as well as observers from other countries, in order to survey the state of the art, exchange scientific information, and establish closer collaboration for further, better coordinated scientific effort in this important area of research and exploration.
Author: Vladimir Litvinenko
Publisher: CRC Press
ISBN: 0429868596
Category : Technology & Engineering
Languages : en
Pages : 1670
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Book Description
Geomechanics and Geodynamics of Rock Masses contains contributions presented at EUROCK 2018, the 2018 International Symposium of the International Society for Rock Mechanics (ISRM 2018, Saint Petersburg, Russia, 22-26 May 2018). Dedicated to recent advances and achievements in the fields of geomechanics and geotechnology, the main topics of the book include: - Physical and mechanical properties of fractured rock (laboratory testing and rock properties, field measurements and site investigations) - Geophysics in rock mechanics - Rock mass strength and failure - Nonlinear problems in rock mechanics - Effect of joint water on the behavior of rock foundation - Numerical modeling and back analysis - Mineral resources development: methods and rock mechanics problems - Rock mechanics and underground construction in mining, hydropower industry and civil engineering - Rock mechanics in petroleum engineering - Geodynamics and monitoring of rock mass behavior - Risks and hazards - Geomechanics of technogenic deposits Geomechanics and Geodynamics of Rock Masses will be of interest to researchers and professionals involved in the various branches of rock mechanics and rock engineering. EUROCK 2018, organized by the Saint Petersburg Mining University, is a continuation of the successful series of ISRM symposia in Europe, which began in 1992 in Chester, UK.
Author: Vladimir Litvinenko
Publisher: CRC Press
ISBN: 0429867727
Category : Technology & Engineering
Languages : en
Pages : 960
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Book Description
This book is Volume 1 of the EUROCK 2018 proceedings. Geomechanics and Geodynamics of Rock Masses contains contributions presented at EUROCK 2018, the 2018 International Symposium of the International Society for Rock Mechanics (ISRM 2018, Saint Petersburg, Russia, 22-26 May 2018). Dedicated to recent advances and achievements in the fields of geomechanics and geotechnology, the main topics of the book include: - Physical and mechanical properties of fractured rock (laboratory testing and rock properties, field measurements and site investigations) - Geophysics in rock mechanics - Rock mass strength and failure - Nonlinear problems in rock mechanics - Effect of joint water on the behavior of rock foundation - Numerical modeling and back analysis - Mineral resources development: methods and rock mechanics problems - Rock mechanics and underground construction in mining, hydropower industry and civil engineering - Rock mechanics in petroleum engineering - Geodynamics and monitoring of rock mass behavior - Risks and hazards - Geomechanics of technogenic deposits Geomechanics and Geodynamics of Rock Masses will be of interest to researchers and professionals involved in the various branches of rock mechanics and rock engineering. EUROCK 2018, organized by the Saint Petersburg Mining University, is a continuation of the successful series of ISRM symposia in Europe, which began in 1992 in Chester, UK.
Author: Heping Xie
Publisher: CRC Press
ISBN: 1351042653
Category : Technology & Engineering
Languages : en
Pages : 92
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Book Description
At present, deep earth resources remain poorly understood and entirely under-utilised. There is a growing appreciation of the important role deep earth will play in future sustainability, particularly in opportunities for new and sustainable large-scale energy alternatives, and extraction of resources through mining and greenhouse mitigation. Deep Rock Mechanics: From Research to Engineering is a collection of papers on the effective development of deep earth resources, which were presented at the International Conference on Geo-mechanics, Geo-Energy and Geo-Resources 2018 (Chengdu, P.R. China, 22-24 September 2018). The contributions aim at breaking beyond existing patterns of discovery, to advance research on geomechanical and geophysical processes in deep earth resources and energy development, enhancing deep earth energy and mineral extraction and mitigating harmful atmospheric emissions. Deep Rock Mechanics: From Research to Engineering covers a wide range of topics: 1. Deep rock mechanics and mining theory 2. Water resources development and protection 3. Unconventional oil and gas extractions 4. CO2 sequestrations technologies and nuclear waste disposal 5. Geothermal energy 6. Mining engineering 7. Petroleum engineering 8. Geo-environmental engineering 9. Civil geotechnical engineering Deep Rock Mechanics: From Research to Engineering promotes safer and greener ways for energy and resource production at great depth, and will serve as a must-have reference for academics and professionals involved or interested in geo-mechanics, geo-energy, and geo-resources.
Author: Sadiq J. Zarrouk
Publisher: Academic Press
ISBN: 0128192666
Category : Science
Languages : en
Pages : 366
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Book Description
Geothermal Well Test Analysis: Fundamentals, Applications and Advanced Techniques provides a comprehensive review of the geothermal pressure transient analysis methodology and its similarities and differences with petroleum and groundwater well test analysis. Also discussed are the different tests undertaken in geothermal wells during completion testing, output/production testing, and the interpretation of data. In addition, the book focuses on pressure transient analysis by numerical simulation and inverse methods, also covering the familiar pressure derivative plot. Finally, non-standard geothermal pressure transient behaviors are analyzed and interpreted by numerical techniques for cases beyond the limit of existing analytical techniques. Provides a guide on the analysis of well test data in geothermal wells, including pressure transient analysis, completion testing and output testing Presents practical information on how to avoid common issues with data collection in geothermal wells Uses SI units, converting existing equations and models found in literature to this unit system instead of oilfield units
Author: Chao Zeng
Publisher:
ISBN:
Category :
Languages : en
Pages : 229
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Book Description
"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 water is heated by contact with rock and returns to the surface through production well. Fracture provides the primary conduit for fluid flow and heat transfer in natural rock. Fracture is propped by fracture roughness with varying heights which is called asperity. The stability of asperity determines fracture aperture and hence imposes substantial effect on hydraulic conductivity and heat transfer efficiency in EGS. Firstly, two rough fracture surfaces are characterized by statistical method and fractal analysis. The asperity heights and enclosed aperture heights are described by probability density function before cold water is pumped into fracture. Secondly, when water injection and induced cooling occurs, the thermomechanical analysis of single asperity is studied by establishing an un-symmetric damage mechanics model. The deformation curve of asperity under thermal stress is determined. Thirdly, deformation of fracture with various asperities on it in response to thermal stress is analyzed by a new stratified continuum percolation model. This model incorporates the fracture surface characteristics and preceding deformation curve of asperity. The fracture closure and fracture stiffness can be accurately quantified by this model. In addition, the scaling invariance and multifractal parameters in this process are identified and validated with Monte Carlo simulation"--Abstract, page iii.
Author: Reşat Ulusay
Publisher: CRC Press
ISBN: 1315388499
Category : Technology & Engineering
Languages : en
Pages : 1371
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Book Description
Rock Mechanics and Rock Engineering: From the Past to the Future contains the contributions presented at EUROCK2016, the 2016 International Symposium of the International Society for Rock Mechanics (ISRM 2016, Ürgüp, Cappadocia Region, Turkey, 29-31 August 2016). The contributions cover almost all aspects of rock mechanics and rock engineering from theories to engineering practices, emphasizing the future direction of rock engineering technologies. The 204 accepted papers and eight keynote papers, are grouped into several main sections: - Fundamental rock mechanics - Rock properties and experimental rock mechanics - Analytical and numerical methods in rock engineering - Stability of slopes in civil and mining engineering - Design methodologies and analysis - Rock dynamics, rock mechanics and rock engineering at historical sites and monuments - Underground excavations in civil and mining engineering - Coupled processes in rock mass for underground storage and waste disposal - Rock mass characterization - Petroleum geomechanics - Carbon dioxide sequestration - Instrumentation-monitoring in rock engineering and back analysis - Risk management, and - the 2016 Rocha Medal Lecture and the 2016 Franklin Lecture Rock Mechanics and Rock Engineering: From the Past to the Future will be of interest to researchers and professionals involved in the various branches of rock mechanics and rock engineering. EUROCK 2016, organized by the Turkish National Society for Rock Mechanics, is a continuation of the successful series of ISRM symposia in Europe, which began in 1992 in Chester, UK.
Author: U.S. National Committee for Rock Mechanics. Panel on Rock-mechanics Research Requirements
Publisher: National Academies
ISBN:
Category : Building
Languages : en
Pages : 252
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Book Description
