Download or read book Experimental Determination of Tracer Dispersivity in Fractures written by and published by . This book was released on 1985 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Reinjection of waste hot water is commonly practiced in most geothermal fields, primarily as a means of disposal. Surface discharge of these waste waters is usually unacceptable due to the resulting thermal and chemical pollution. Although reinjection can help to main reservoir pressure and fluid volume, in some cases a decrease in reservoir productivity has been observed. This is caused by rapid flow of the reinjected water through fractures connecting the injector and producers. As a result, the water is not sufficiently heated by the reservoir rock, and a reduction in enthalpy of the produced fluids is seen. Tracer tests have proven to be valuable to reservoir engineers for the design of a successful reinjection program. By injecting a slug of tracer and studying the discharge of surrounding producing wells, an understanding of the fracture network within a reservoir can be provided. In order to quantify the results of a tracer test, a model that accurately describes the mechanisms of tracer transport is necessary. One such mechanism, dispersion, is like a smearing out of a tracer concentration due to the velocity gradients over the cross section of flow. If a dispersion coefficient can be determined from tracer test data, the fracture width can be estimated. The purpose of this project was to design and construct an apparatus to study the dispersion of a chemical tracer in flow through a fracture.
Download or read book Experimental Determination of the Effective Taylor Dispersivity in a Fracture written by and published by . This book was released on 1984 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The applicability and accuracy of the approximation for Taylor Dispersion was experimentally determined for the diffusion of a chemical tracer in flow through a fracture. 12 refs., 16 figs., 10 tabs. (ACR).
Download or read book Design and Analysis of Tracer Tests to Determine Effective Porosity and Dispersivity in Fractured Sedimentary Rocks Newark Basin New Jersey written by Glen B. Carleton and published by . This book was released on 1999 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Rock Fractures and Fluid Flow written by National Research Council and published by National Academies Press. This book was released on 1996-08-27 with total page 568 pages. Available in PDF, EPUB and Kindle. Book excerpt: Scientific understanding of fluid flow in rock fracturesâ€"a process underlying contemporary earth science problems from the search for petroleum to the controversy over nuclear waste storageâ€"has grown significantly in the past 20 years. This volume presents a comprehensive report on the state of the field, with an interdisciplinary viewpoint, case studies of fracture sites, illustrations, conclusions, and research recommendations. The book addresses these questions: How can fractures that are significant hydraulic conductors be identified, located, and characterized? How do flow and transport occur in fracture systems? How can changes in fracture systems be predicted and controlled? Among other topics, the committee provides a geomechanical understanding of fracture formation, reviews methods for detecting subsurface fractures, and looks at the use of hydraulic and tracer tests to investigate fluid flow. The volume examines the state of conceptual and mathematical modeling, and it provides a useful framework for understanding the complexity of fracture changes that occur during fluid pumping and other engineering practices. With a practical and multidisciplinary outlook, this volume will be welcomed by geologists, petroleum geologists, geoengineers, geophysicists, hydrologists, researchers, educators and students in these fields, and public officials involved in geological projects.
Download or read book Workshop Report written by and published by . This book was released on with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Comparison Between Solute Transport in a Discrete Fracture and in a Fracture Network Using a Novel Method for Tracer Detection written by Brian Hector Mathias Moore and published by . This book was released on 2008 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt: Characterization of field-scale transport in bedrock aquifers is necessary due to the preponderance of groundwater contamination in these settings, and the increasing attention paid to these sites by regulatory bodies. However, as a result of the inherent complexity, and the consequent uncertainty in the dominant transport processes, large-scale transport in fractured rock is poorly understood. In this study an investigation of large-scale transport was accomplished in part by conducting a radial-divergent tracer experiment in a 15 m thick section of aquifer with observations over a 245 m distance, using a novel tracer detection method capable of detecting breakthrough in individual fractures. The tracer experiment was conducted at a well-characterized field site in Smithville, Ontario, which is underlain by several large-scale bedding plane fractures, and used a submersible fluorometer to detect tracer arrival in-situ and to obtain vertical fluorescence profiles (VFPs) from observation boreholes. To complete the investigation, hydraulic characterization data and VFPs were used to approximate the dominant transport pathways and a numerical model which solves for flow and transport in discrete fracture features (HydroGeoSphere) was used to simulate the tracer experiment. The results of the experiment and the modeling exercise were compared to those from a large-scale single fracture tracer experiment conducted previously at the same site, for which the modeling was revisited. The experimental results of the fracture network experiment (FNE) were markedly more heterogeneous than those of the previously conducted single fracture experiment (SFE), with multiple peaks in the breakthrough curves, and scale dependent changes in breakthrough character. The VFPs illustrate that differences in the observed transport arise due to tortuous transport pathways within individual fracture features, and the combined effect of this tortuosity in the numerous fractures contributing to transport in the fracture network. For the observation boreholes closest to the source (
Download or read book Design and Analysis of Tracer Tests to Determine Effective Porosity and Dispersivity in Fractured Sedimentary Rocks Newark Basin New Jersey written by Glen B. Carleton and published by . This book was released on 1999 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The QTRACER Program for Tracer breakthrough Curve Analysis for Karst and Fractured rock Aquifers written by Malcolm S. Field and published by . This book was released on 1999 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Preliminary Interpretation of Tracer Experiments Conducted in a Discrete Rock Fracture Under Conditions of Ambient Flow written by Kent S. Novakowski and published by . This book was released on 1995 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Energy Research Abstracts written by and published by . This book was released on 1994 with total page 586 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Tracers and Modelling in Hydrogeology written by Alain Dassargues and published by IAHS Press. This book was released on 2000 with total page 588 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A New Approach to Tracer Transport Analysis written by C. F. Tsang and published by . This book was released on 1989 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Interpretation of Field Tracer Tests of a Single Fracture Using a Transient Solute Storage Model written by K. G. Raven and published by . This book was released on 1987 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Interpretation of a Tracer Experiment Conducted in a Single Fracture Under Conditions of Natural Groundwater Flow written by P. A. Lapcevic and published by . This book was released on 1997 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proceedings of the Conference on Technology Based Confidence Building Energy and Environment written by and published by . This book was released on 1989 with total page 536 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proceedings of the New Zealand Geothermal Workshop written by and published by . This book was released on 1988 with total page 514 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Mechanical Dispersion in Fractured Crystalline Rock Systems written by D. W. Lafleur and published by . This book was released on 1986 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt:
