The Use of Tracers to Analyze the Effects of Reinjection Into Fractured Geothermal Reservoirs PDF Download
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Author:
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Category : Geothermal reservoirs
Languages : en
Pages :
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Book Description
Author:
Publisher:
ISBN:
Category : Geothermal reservoirs
Languages : en
Pages :
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Book Description
Author:
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ISBN:
Category :
Languages : en
Pages :
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Book Description
Tracer tests have been an important technique for determining the flow and reservoir characteristics in various rock matrix systems. While the interwell tracer tests are aimed at the characterization of the regions between the wells, single-well injection-backflow tracer tests may be useful tools of preliminary evaluation, before implementing long term interwell tracer tests. This work is concerned with the quantitative evaluation of the tracer return profiles obtained from single well injection-backflow tracer tests. First, two mathematical models of tracer transport through fractures, have been reviewed. These two models are based on two different principles: Taylor Dispersion along the fracture and simultaneous diffusion in and out of the adjacent matrix. Then the governing equations for the transport during the injection-backflow tests have been solved. Finally the results were applied to field data obtained from Raft River and East Mesa geothermal fields. In order to determine the values of the parameters of the models that define the transport mechanisms through fractures a non-linear optimization technique was employed. 26 refs., 10 figs.
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Category : Power resources
Languages : en
Pages : 762
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Book Description
Semiannual, with semiannual and annual indexes. References to all scientific and technical literature coming from DOE, its laboratories, energy centers, and contractors. Includes all works deriving from DOE, other related government-sponsored information, and foreign nonnuclear information. Arranged under 39 categories, e.g., Biomedical sciences, basic studies; Biomedical sciences, applied studies; Health and safety; and Fusion energy. Entry gives bibliographical information and abstract. Corporate, author, subject, report number indexes.
Author: B. Zemel
Publisher: Elsevier
ISBN: 0080543146
Category : Science
Languages : en
Pages : 515
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Book Description
This book is concerned with the application of tracers to a wide variety of oil field operations. It provides the necessary nuclear concepts and techniques which are basic to oil field tracer applications. Laboratory and field techniques are explained and illustrated as are the associated regulatory and safety aspects. Within the book, each area of oil field use is considered separately and specific applications of tracers discussed and relevant literature reviewed. The use of non-radioactive tracers is pointed out wherever it is applicable.Due to the nature of this competitive industry, much research is poorly documented, thus Tracers in the Oil Field aims to make the technology more available to current users in the oil field.
Author: Xingru Wu
Publisher:
ISBN:
Category : Enthalpy
Languages : en
Pages : 304
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A tracer selection protocol was developed after reviewing related literature of tracer applications and doing systematic simulations of tracer injection. An important conclusion is that for superheated geothermal reservoir, the partition coefficient (the K value) of the geothermal tracer should be high in order to get early information about reservoir characterization and liquid breakthrough.
Author:
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Category : Geothermal engineering
Languages : en
Pages : 214
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Author: Martin Peter Fossum
Publisher:
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Category :
Languages : en
Pages : 246
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Author:
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Category :
Languages : en
Pages :
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Author:
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Category :
Languages : en
Pages :
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Two tracer tests on doublet systems in a fractured geothermal system were carried out in Klamath Falls, Oregon. The purpose of the tests were to obtain data which would lead to information about the reservoir and to test the applicability of current tracer flow models. The results show rapid breakthrough times and indicate fracture flow with vigorous mixing of injector fluid before production of same. This leads to the idea that thermal breakthrough is not directly related to tracer breakthrough in the Klamath Union doublet system. There has been no long-term enthalpy loss from exploiting the resource for 40 years. In order to reduce the data, models were developed to analyze the results. Along with a porous media flow model two mathematical models developed to analyze fractured geothermal systems are used to help decipher the various tracer return curves. The flow of tracers in doublet systems was investigated. A mathematical description is used for tracer flow through fractures as a function of time and various nonlinear parameters which can be found using a curve fitting technique. This allows the reservoir to be qualitatively defined. These models fit the data well, but point to the fact that future improvement needs to be considered for a clearer and more quantitative understanding of fractured geothermal systems. 22 refs., 32 figs., 11 tabs.
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Languages : en
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Tracer injection for identifying reservoir and transport parameters in geothermal sources has become an important procedure for designing an optimum reinjection program. Field tests have been analyzed using convection-diffusion equation to predict fracture size, width and probable thermal breakthrough times. The present study was conducted in a laboratory fractured reservoir model whose physical properties were known. The tracer, KI, breakthrough profiles were analyzed for different injection-production depth schemes. For different patterns different preferential flow paths existed which were then affected by flow through auxiliary paths. A correlation between heat and mass transport was used to define an apparent heat transfer coefficient for the flow. 3 tabs., 5 figs., 7 refs.
