Download or read book Heat Deliverability of Homogeneous Geothermal Reservoirs written by and published by . This book was released on 1991 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: For the last two decades, the petroleum industry has been successfully using simple inflow performance relationships (IPR's) to predict oil deliverability. In contrast, the geothermal industry lacked a simple and reliable method to estimate geothermal wells' heat deliverability. To address this gap in the standard geothermal-reservoir-assessment arsenal, we developed generalized dimensionless geothermal inflow performance relationships (GIPR's). These ''reference curves'' may be regarded as an approximate general solution of the equations describing the practically important case of radial 2-phase inflow. Based on this approximate solution, we outline a straightforward approach to estimate the reservoir contribution to geothermal wells heat and mass deliverability for 2-phase reservoirs. This approach is far less costly and in most cases as reliable as numerically modeling the reservoir, which is the alternative for 2-phase inflow.

Download or read book Deliverability of Geothermal Reservoirs written by UNU Geothermal Training Programme (Iceland). and published by . This book was released on 1988 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Geothermal Reservoir Engineering written by Malcomm Grant and published by Elsevier. This book was released on 2013-02-07 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt: Geothermal Reservoir Engineering offers a comprehensive account of geothermal reservoir engineering and a guide to the state-of-the-art technology, with emphasis on practicality. Topics covered include well completion and warm-up, flow testing, and field monitoring and management. A case study of a geothermal well in New Zealand is also presented. Comprised of 10 chapters, this book opens with an overview of geothermal reservoirs and the development of geothermal reservoir engineering as a discipline. The following chapters focus on conceptual models of geothermal fields; simple models that illustrate some of the processes taking place in geothermal reservoirs under exploitation; measurements in a well from spudding-in up to first discharge; and flow measurement. The next chapter provides a case history of one well in the Broadlands Geothermal Field in New Zealand, with particular reference to its drilling, measurement, discharge, and data analysis/interpretation. The changes that have occurred in exploited geothermal fields are also reviewed. The final chapter considers three major problems of geothermal reservoir engineering: rapid entry of external cooler water, or return of reinjected water, in fractured reservoirs; the effects of exploitation on natural discharges; and subsidence. This monograph serves as both a text for students and a manual for working professionals in the field of geothermal reservoir engineering. It will also be of interest to engineers and scientists of other disciplines.

Download or read book Geothermal Reservoir Engineering in Perspective written by UNU Geothermal Training Programme (Iceland). and published by . This book was released on 1985 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Geothermal Energy Delivering on the Global Potential written by and published by . This book was released on 2015 with total page 430 pages. Available in PDF, EPUB and Kindle. Book excerpt: After decades of being largely the preserve of countries in volcanic regions, the use of geothermal energy--for both heat and power applications--is now expanding worldwide. This reflects its excellent low-carbon credentials and its ability to offer baseload and dispatchable output - rare amongst the mainstream renewables. Yet uptake of geothermal still lags behind that of solar and wind, principally because of (i) uncertainties over resource availability in poorly-explored reservoirs and (ii) the concentration of full-lifetime costs into early-stage capital expenditure (capex). Recent advances in reservoir characterization techniques are beginning to narrow the bounds of exploration uncertainty, both by improving estimates of reservoir geometry and properties, and by providing pre-drilling estimates of temperature at depth. Advances in drilling technologies and management have potential to significantly lower initial capex, while operating expenditure is being further reduced by more effective reservoir management -- supported by robust mathematical models -- and increasingly efficient energy conversion systems (flash, binary and combined-heat-and-power). Advances in characterization and modelling are also improving management of shallow low-enthalpy resources that can only be exploited using heat-pump technology. Taken together with increased public appreciation of the benefits of geothermal, the technology is finally ready to take its place as a mainstream renewable technology, This book draws together some of the latest developments in concepts and technology that are enabling the growing realisation of the global potential of geothermal energy in all its manifestations.After decades of being largely the preserve of countries in volcanic regions, the use of geothermal energy--for both heat and power applications--is now expanding worldwide. This reflects its excellent low-carbon credentials and its ability to offer baseload and dispatchable output - rare amongst the mainstream renewables. Yet uptake of geothermal still lags behind that of solar and wind, principally because of (i) uncertainties over resource availability in poorly-explored reservoirs and (ii) the concentration of full-lifetime costs into early-stage capital expenditure (capex). Recent advances in reservoir characterization techniques are beginning to narrow the bounds of exploration uncertainty, both by improving estimates of reservoir geometry and ...

Download or read book 1990 International Symposium on Geothermal Energy written by and published by . This book was released on 1990 with total page 916 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Thermal Performance Evaluations of Fractured and Closed loop Geothermal Reservoirs written by Nicolás Rangel Jurado and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book Experimental Studies on Heat Extraction from Fractured Geothermal Reservoirs written by Paul Kruger and published by . This book was released on 1982 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Steady Heat and Mass Transfer in Two phase Geothermal Reservoirs written by Mark J. McGuinness and published by . This book was released on 1996 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book In Situ Heat Transfer in Man made Geothermal Energy Reservoirs written by and published by . This book was released on 1980 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Two hot dry rock geothermal energy reservoirs were created by hydraulic fracturing of Precambrian granitic rock on the west flank of the Valles Caldera, a dormant volcanic complex, in the Jemez Mountains of northern New Mexico. Heat was extracted in a closed-loop mode of operation, injecting water into one well and extracting the heated water from a separate production well. The first reservoir was produced by fracturing the injection well at a depth of 2.75 km (9020 ft) where the indigenous rock temperature was 185°C. The relatively rapid thermal drawdown of the water produced from the first reservoir, 100°C in 74 days, indicated that its effective fracture radius was about 60 m (200 ft). Average thermal power extracted was 4 MW. A second, larger reservoir was created by refracturing the injection well 180 m (600 ft) deeper. Downhole measurements of the water temperature at the reservoir outlet as well as temperatures inferred from chemical geothermometry showed that the thermal drawdown of this reservoir was negligible; the effective heat transfer area of the new reservoir must be at least 45,000 m2 (480,000 ft2), nearly six times larger than the first reservoir. In addition reservoir residence time studies employing visible dye tracers indicated that the mean volume of the second reservoir is nine times larger. Other measurements showed that flow impedances were low, downhole water losses from these reservoirs should be manageable, that the geochemistry of the produced water was essentially benign, with no scaling problems apparent, and that the level of induced seismic activity was insignificantly small.

Download or read book Fluid and Heat Flow in Gas rich Geothermal Reservoirs written by and published by . This book was released on 1983 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Numerical-simulation techniques are used to study the effects of noncondensible gases (CO2) on geothermal reservoir behavior in the natural state and during exploitation. It is shown that the presence of CO2 has large effects on the thermodynamic conditions of a reservoir in the natural state, especially on temperature distributions and phase compositions. The gas will expand two-phase zones and increase gas saturations to enable flow of CO2 through the system. During exploitation, the early pressure drop is primarily due to degassing of the system. This process can cause a very rapid initial pressure drop, on the order of tens of bars, depending upon the initial partial pressure of CO2. The following gas content from wells can provide information on in-place gas saturations and relative permeability curves that apply at a given geothermal resource. Site-specific studies are made for the gas-rich two-phase reservoir at the Ohaki geothermal field in New Zealand. A simple lumped-parameter model and a vertical column model are applied to the field data. The results obtained agree well with the natural thermodynamic state of the Ohaki field (pressure and temperature profiles) and a partial pressure of 15 to 25 bars is calculated in the primary reservoirs. The models also agree reasonably well with field data obtained during exploitation of the field. The treatment of thermophysical properties of H2O-CO2 mixtures for different phase compositions is summarized.

Download or read book Thermo poroelastic Reservoir Response of Multi well and Multi fracture Geothermal Systems written by Matthew Laughlin McLean and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Shallow and deep geothermal reservoirs are potential renewable energy sources. Heat recovery from geothermal reservoirs disrupts the natural temperature distribution and induces thermo-poroelastic responses in the geothermal reservoir. Single-well or double-well systems generally affect a small reservoir volume. Shallow geothermal projects often present a drained response and are unlikely to disturb deep faults. However, an upscaling of geothermal energy requires massive geothermal systems at large depths where the reservoir coupled thermo-poroelastic response to heat drainage is more pronounced and may approach undrained conditions. This work provides novel numerical simulations of geothermal reservoirs completed with (1) multi-stage hydraulic fracturing and (2) closed-loop multilateral-wells to investigate the drained and undrained thermo-poroelastic response when subjected to heat drainage. The numerical solutions are based on the theory of thermo-poroelasticity and solved through the Finite Element Method in two and three-dimensions. A rigorous mechanical contact model is employed to solve for the internal contact tractions and the fracture opening displacements in response to rock cooling. Results show that late-stage shear reactivation is caused mostly by thermo-elastic destressing. Stress changes towards shear failure and potential fault/fracture reactivation are driven by reduction in effective horizontal stresses and therefore are most likely in tectonically passive or extensional environments. The simulations predict thermal recovery factors in the order of 5-50% of the original heat in place for the given initial pressure and stress conditions, mostly limited by a rigorous limit on fracture reactivation of 10% of the thermal reservoir volume. Larger thermal recovery factors could be achieved in (1) tectonically compressive environments, (2) locations where the initial stress anisotropy is low, and (3) deep locations where in-situ effective stresses are large. The inclusion of a limit to fracture reactivation serves as a proxy for maximum allowed induced seismicity, limiting the technically recoverable heat, and provides more realistic estimations of geothermal energy reserves

Download or read book Federal Energy Administration Project Independence Blueprint written by United States. Federal Energy Administration and published by . This book was released on 1974 with total page 700 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Petroleum Abstracts Literature and Patents written by and published by . This book was released on 1989 with total page 1528 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Project Independence Transcript of the Seventh Public Hearing written by United States. Federal Energy Administration and published by . This book was released on 1974 with total page 738 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Project Independence written by United States. Federal Energy Administration and published by . This book was released on 1974 with total page 730 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Project Independence Blueprint written by United States. Federal Energy Administration and published by . This book was released on 1974 with total page 708 pages. Available in PDF, EPUB and Kindle. Book excerpt: What is Project Independence? The sources and uses of energy in the United States have changed dramatically in the last several decades. As a result, in just one generation, we have shifted from a position of domestic energy abundance to a substantial and continually growing reliance on foreign energy sources. Project Independence is a wide-ranging program to evaluate this growing dependence on foreign sources of energy, and to develop positive programs to reduce our vulnerability to future oil cut-offs and price increases.