Characterization Of Thermal Properties Of Geothermal Reservoirs
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Characterization Of Thermal Properties Of Geothermal Reservoirs
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Author : Konstantinos Bischiniotis
language : en
Publisher:
Release Date : 2018
Characterization Of Thermal Properties Of Geothermal Reservoirs written by Konstantinos Bischiniotis and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018 with categories.
Marktpsychologie
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Author :
language : en
Publisher:
Release Date : 1983
Marktpsychologie written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1983 with categories.
Analysis Of Heat Transfer And Energy Recovery In Fractured Geothermal Reservoirs
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Author :
language : en
Publisher:
Release Date : 1978
Analysis Of Heat Transfer And Energy Recovery In Fractured Geothermal Reservoirs written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1978 with Earth temperature categories.
Thermal Properties And Temperature Related Behavior Of Rock Fluid Systems
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Author : W.H. Somerton
language : en
Publisher: Elsevier
Release Date : 1992-03-02
Thermal Properties And Temperature Related Behavior Of Rock Fluid Systems written by W.H. Somerton and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992-03-02 with Technology & Engineering categories.
This book brings together for the first time the results of research on the thermal properties and temperature-related behavior of rocks with their contained fluids, under subsurface environmental conditions. These data are of increasing importance with increased application of underground processes involving high temperature and, in some cases, low temperature environments. Some of the important processes are described in which thermal data are needed. Chapters deal with thermal properties of rocks, including heat capacities, thermal conductivities and thermal diffusivities under conditions simulating subsurface environments. Discussion about the difficulty in measuring thermal properties of rock/fluid systems is included along with newly-developed models for predicting thermal properties from more-easily measured properties. The effects of thermal reactions in rocks, differential thermal expansion, and thermal alterations are discussed in separate chapters. The effects of temperature on rock properties, as distinct from the irreversible effects of heating, are reviewed. Lastly the book deals with wellbore applications of thermal and high-temperature behavior of rocks and methods of deducing thermal properties from geophysical logs run in boreholes. Appendices include thermal units conversion factors and thermal properties of some typical reservoir rocks and fluids.
Initial Measurements Of Petrophysical Properties On Rocks From The Los Azufres Mexico Geothermal Field
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Author :
language : en
Publisher:
Release Date : 1986
Initial Measurements Of Petrophysical Properties On Rocks From The Los Azufres Mexico Geothermal Field written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1986 with categories.
Petrophysical properties of geothermal reservoir rocks are valuable information for many activities, including reservoir characterization, modeling, field test analysis and planning of exploitation techniques. Petrophysical data of rocks from geothermal reservoirs located in volcanic areas is in general very scarce. In particular, no petrophysical data of rocks from the Los Azufres geothermal field area has ever been published. This work presents the results of initial petrophysical studies on outcrop rocks and drill core samples from the Los Azufres geothermal field. These studies are the first part of an ongoing experimental program intended to establish a data-base about physical properties of the Los Azufres rocks, in support of the many reservoir engineering activities which require of such information. The experimental work carried out consisted of laboratory measurements of density, porosity, permeability, compressibility, thermal conductivity, thermal expansion, electrical resistivity and sonic wave velocities. Some of the experiments were aimed at investigation of the effects of temperature, pressure, saturation and other parameters on the physical properties of rocks.
Theoretical Analysis Of Fluid Flow And Energy Transport In Hydrothermal Systems
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Author : Charles R. Faust
language : en
Publisher:
Release Date : 1977
Theoretical Analysis Of Fluid Flow And Energy Transport In Hydrothermal Systems written by Charles R. Faust and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1977 with Energy transfer categories.
Underground Thermal Energy Storage
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Author : Kun Sang Lee
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-10-12
Underground Thermal Energy Storage written by Kun Sang Lee and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-10-12 with Technology & Engineering categories.
Underground thermal energy storage (UTES) provide us with a flexible tool to combat global warming through conserving energy while utilizing natural renewable energy resources. Primarily, they act as a buffer to balance fluctuations in supply and demand of low temperature thermal energy. Underground Thermal Energy Storage provides an comprehensive introduction to the extensively-used energy storage method. Underground Thermal Energy Storage gives a general overview of UTES from basic concepts and classifications to operation regimes. As well as discussing general procedures for design and construction, thermo-hydro geological modeling of UTES systems is explained. Finally, current real life data and statistics are include to summarize major global developments in UTES over the past decades. The concise style and thorough coverage makes Underground Thermal Energy Storage a solid introduction for students, engineers and geologists alike.
Estimation Of Near Wellbore Thermal Properties Using Distributed Temperature And Flow Rate Data During Production
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Author : Kourosh Ahadi
language : en
Publisher:
Release Date : 2021
Estimation Of Near Wellbore Thermal Properties Using Distributed Temperature And Flow Rate Data During Production written by Kourosh Ahadi and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021 with categories.
Thermal properties of the underground formation govern the downhole thermal processes such as geothermal energy utilization and thermal enhanced oil recovery. In order to design and monitor the subsurface thermal processes, accurate values of the thermal properties are needed. Unless perfect descriptions of the formation and fluids are given, the results of measuring the thermal properties of formation and fluid-formation systems are of limited value. However, calculation of such properties is effortful, costly and time consuming. Therefore, a need exists to propose models of predicting thermal properties from other more effortlessly measurable properties. With technology development, in-situ measurements have gotten more attention to reduce the cost and time needed to measure the properties with higher accuracy. Close correlations between wellbore fluid temperature and its surrounding formation have made the temperature data as an ideal source to study the underneath formation. This study firstly presents an analytical temperature model to compute wellbore fluid temperature profile in a producing wellbore. This analytical model is then compared to a numerical model to assess the accuracy and limitation of the approach. Next, sets of numerical models are used through an inversion process developed in MATLAB software to predict the formation thermal properties including geothermal gradient and thermal conductivity factors as well as days of production. Finally, the approach is applied to real data from a water producing wellbore. The temperature profile in this wellbore was recorded by Distributed Temperature Sensing (DTS) in a producing fractured wellbore under three different flow conditions representing three different flow rate profiles along the wellbore. The results showed that the predicted thermal properties are in good conformity with the results obtained by the performed laboratory experiments on the same geological site by other works with around 10 % of error for estimation of formation thermal conductivity and less than 5 % of error in formation geothermal gradient estimation. The proposed method in this thesis is also be applicable to the petroleum wellbores. For instance, the production logging data (including flow rate and temperature profiles) in production wellbores could be used in this approach to provide additional information about the thermal properties of the near wellbore formation. The estimated thermal properties might be further applied to assess and design the future thermal operation plans. The other application of this approach would be in characterization of the geothermal wells and reservoirs shaping the future energy supply.
Thermal Performance Evaluations Of Fractured And Closed Loop Geothermal Reservoirs
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Author : Nicolás Rangel Jurado
language : en
Publisher:
Release Date : 2021
Thermal Performance Evaluations Of Fractured And Closed Loop Geothermal Reservoirs written by Nicolás Rangel Jurado and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021 with categories.
Earth's interior contains an enormous amount of heat that can be exploited for carbon-free direct-use or electricity generation. Even though numerous studies have predicted that geothermal power will become an important contributor to the world's energy mix, the use of these resources is still growing at a notably slow speed compared to other renewable energy alternatives. This thesis uses computational models to explore the technical challenges that two kinds of geothermal resources face to reach full commercialization. In particular, the temporal evolution of heat production of several fractured and closed-loop geothermal reservoirs is investigated. Thermal-hydraulic simulations are conducted for a fractured meso-scale geothermal reservoir in northern New York, USA. The modeling parameters considered here are constrained by empirical data related to lithology, hydrogeology, and thermal behavior measurements collected on site. This work shows how the addition of realistic complexities, that are well-constrained by field data and often disregarded, can significantly improve the thermal performance predictions compared to overly simplified models. Additionally, the results presented here highlight the importance of characterizing subsurface permeability distributions in order to optimize thermal efficiency and devise appropriate reservoir management strategies that extend the lifespan of geothermal reservoirs. To evaluate how closed-loop or advanced geothermal systems (AGS) compare to alternative ways of extracting geothermal energy, several AGS designs displaying varying reservoir and operating conditions are evaluated to estimate their heat and temperature generating potential. Our findings indicate that the thermal efficiency of AGS is characterized by a considerable exergy loss. Sensitivity analyses show that varying different parameters have slight and moderate improvements on thermal performance, however, AGS designs appear to present multiple technical challenges making them less cost-competitive than both conventional hydrothermal systems and enhanced geothermal systems (EGS). The following key findings summarize the results of these two studies: 1) if well-constrained, computational models are a good tool to assess, manage and intervene geothermal reservoirs to ensure their long-term sustainability, 2) non-uniform permeability can drastically modify fluid flow and heat transport processes in geothermal reservoirs compared to theoretical models that consider homogenous reservoir properties, 3) prospecting adequate subsurface properties is of critical importance to develop geothermal reservoirs, and 4) despite their recent popularity, closed-loop systems are expected to be considerably less productive than other types of geothermal resources at a similar scale.
Temperature Sensitive Tracers For Fractured Geothermal Reservoir Characterization
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Author : Morgan F. Ames
language : en
Publisher:
Release Date : 2016
Temperature Sensitive Tracers For Fractured Geothermal Reservoir Characterization written by Morgan F. Ames and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
One of the most significant open problems in geothermal reservoir engineering is the development of a reliable and accurate method to predict thermal breakthrough. Such a method would enable more informed decisions to be made regarding reservoir management. Methods developed at present include analytical models and solute tracers, both of which have limitations. The use of particles as temperature-sensitive tracers is a promising approach due to the high degree of control of the physical and chemical properties of nanomaterials and micromaterials. Additionally, particles experience less matrix diffusion than solute tracers and tend to stay in high velocity fluid streamlines, which results in earlier particle breakthrough in the absence of significant particle deposition. These properties could potentially be exploited to infer temperature and measurement location, which could in turn provide useful information about thermal breakthrough. In order to assess whether particle tracers can provide more useful information about future thermal behavior of reservoirs than existing solute tracers, models were developed for both solute tracers and particle tracers. Three existing solute tracer types were modeled: conservative solute tracers (CSTs), reactive solute tracers with temperature-dependent reaction kinetics (RSTs), and sorbing solute tracers that sorb reversibly to fracture walls (SSTs). Additionally, three particle tracers which have not been developed in practice were modeled: dye-releasing tracers (DRTs) that release a solute dye at a specified temperature threshold, threshold nanoreactor tracers (TNRTs) with an encapsulated reaction that does not begin until a specified temperature threshold is reached, and temperature-time tracers (TTTs) capable of recording detailed temperature-time histories of each particle. In this study, TTTs represent the most informative tracer with respect to thermal breakthrough. These models were used in the context of an inverse problem in which synthetic tracer data were calculated for several "true" discrete fracture networks. Next, computational optimization was used to match these data by adjusting fracture location, length, and orientation for a variable number of fractures. Finally, the thermal behaviors of the fracture networks with the best fits to the data were compared to those of the true fracture networks, and the tracers were ranked according to their forecasting ability. Overall, thermal breakthrough forecast error was found to increase with fracture network complexity. However, in all cases, all tracers forecasted thermal breakthrough with unrealistic accuracy. This is partly due to neglecting thermal interference between closely spaced fractures in the thermal model. In all three cases, CSTs were found to be the least informative tracer type because they are insensitive to temperature. SSTs were also modeled as insensitive to temperature in this work, but they performed better than CSTs because sorption is sensitive to surface area, which is also closely related to a reservoir's thermal performance. In order to fully understand the relative informativity of these solute and particle tracers, a second study was performed using a uniform parallel fracture reservoir model that accounts for interference between fractures in both thermal and tracer transport. In this study, a seventh type of tracer test was also considered in which all three solute tracer types (CSTs, RSTs, and SSTs) were used simultaneously to gain the benefits of all three tracer types. This tracer type was designated ALLSOL, which is short for "all solutes." As with the discrete fracture network modeling study, synthetic data were generated and matched using optimization, after which thermal breakthrough forecasts were calculated. The decision variables used in optimization were the number of fractures and fracture length, width, aperture, and spacing. Two inverse problem scenarios with different fracture spacings were examined: 15 meter spacing and 5 meter spacing. In both scenarios, all individual solute tracers had significant error, particle tracers and ALLSOL forecasted thermal breakthrough more accurately than individual solute tracers, and ALLSOL had slightly more accurate forecasts than particle tracers. In the 15 meter spacing scenario, both RST and TNRT had very inaccurate forecasts because the temperature distribution is somewhat insensitive to fracture spacing at early time when fracture spacing is sufficiently large. This resulted in good matches and small objective function values for inaccurate estimates of fracture spacing. In order to determine if other tracers besides RST and TNRT are insensitive to spacing at early time when spacing is sufficiently large, the objective function values of all tracer types were evaluated using the optimal solution for TNRT in the 15 meter spacing scenario. Low objective function values and good fits to the data were observed for every tracer type except for TTT, indicating that TTT is the only tracer type considered that is capable of detecting differences in spacing at early time when the true fracture spacing is large. This is because the temperature is measured directly by the TTT rather than inferring the temperature from the return curve, as is the case for all other tracer types. In the 5 meter spacing case, the RST had a very inaccurate thermal breakthrough forecast because its return curve has a nonunique relationship with the temperature distribution (i.e. the RST return curve was matched by a reservoir with a significantly different temperature distribution from the true reservoir, which happened to result in the same amount of reaction). Forecast error was generally larger in the uniform parallel fracture modeling scenarios than in the discrete fracture network modeling scenarios. This demonstrates the importance of accounting for thermal interference in temperature-sensitive tracer modeling.