Prediction of Scaling Problems Likely to Occur During Geothermal Heat Production Using the FFC-01 Well PDF Download
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Author: Troels Laier
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Troels Laier
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Jansell Jamero
Publisher:
ISBN:
Category : Geothermal power plants
Languages : en
Pages : 194
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Mineral scaling is common in geothermal power facilities. This scale deposition is usually caused by changes in the geothermal fluid temperature or composition. Precipitation of these minerals can limit fluid flow within the pipelines reducing plant efficiency and increasing maintenance costs. A layer of scaling is commonly found in most parts of the geothermal power production facilities. However, significant amounts of deposited mineral scales (mainly silica) are usually observed in the pipelines and vessels that handle super-saturated brines. This work focuses on a less common scaling in geothermal two-phase pipelines, when fluids are usually high in temperature and under-saturated with respect to amorphous silica. This is mainly caused by fluid mixing at the two-phase pipelines, when several wells share the same pipeline to transport the fluid to the downstream facility. Two case studies are discussed in this work reporting mineral scaling due to the mixing of incompatible geothermal fluids within the two-phase headers. The first case tackles the silica deposition caused by the mixing of a steam-dominated well fluid with fluid from two water-dominated wells. The scale deposition is caused by the small amount of brine entrained in the steam-dominated well fluid which reacts upon mixing with the other water-dominated well fluids, causing massive localised scaling at the mixing points. The second case investigates iron mineral and silica deposition caused by the mixing of a low-pH, high-silica fluid with a neutral-pH fluid. Header blockage result in the increase in well head pressures causing production from some wells to collapse, at the same time decreasing the flow of geothermal fluids to the separators. The scaling requires regular cleaning to return the pipelines to full flow capacity. Recommendations are given for each case, for possible site implementation.
Author: Michael Wheelock Swyer
Publisher:
ISBN:
Category :
Languages : en
Pages : 238
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Slip on the geometrically complex Rhyolite Ridge Fault System and associated local stresses in the Desert Peak Geothermal Field in Nevada, were modeled with the boundary element method (BEM) implemented in Poly3D. The impact of uncertainty in the fault geometry at depth, the tectonic stresses driving slip, and the potential ranges of frictional strength resisting slip on the likely predictions of fracture slip and formation in the surrounding volume due to these local stresses were systematically explored and quantified. The effect of parameter uncertainty was evaluated by determining the frequency distribution of model predicted values. Alternatively, Bayesian statistics were used to determine the best fitting values for parameters within a probability distribution derived from the difference of the model prediction from the observed data. This approach honors the relative contribution of uncertainties from all existing data that constrains the fault parameters. Lastly, conceptual models for different fault geometries and their evolution were heuristically explored and the predictions of local stress states were compared to available measurements of the local stresses, fault and fracture patterns at the surface and in boreholes, and the spatial extent of the geothermal field. The complex fault geometry leads to a high degree of variability in the locations experiencing stress states that promote fracture, but such locations generally correlate with the main injection and production wells at Desert Peak. In addition, the strongest and most common stress concentrations occur within relays between unconnected fault segments, and at bends and intersections in faults that connect overlapping fault segments associated with relays. The modeling approach in this study tests the conceptual model of the fault geometry at Desert Peak while honoring mechanical constants and available constraints on driving stresses and provides a framework that aids in geothermal exploration by predicting the spatial variations in stresses likely to cause and reactivate fractures necessary to sustain hydrothermal fluid flow. This approach also quantifies the relative sensitivity of such predictions to fault geometry, remote stress, and friction, and determines the best fitting model with its associated probability.
Author:
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ISBN:
Category :
Languages : en
Pages : 8
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Author: Aeronautical Research Council (Great Britain)
Publisher:
ISBN: 9780114709266
Category : Airplanes
Languages : en
Pages : 1212
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Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1164
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Author: Steven Chu
Publisher: DIANE Publishing
ISBN: 1437944183
Category : Reference
Languages : en
Pages : 166
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This report examines the role of rare earth metals and other materials in the clean energy economy. It was prepared by the U.S. Department of Energy (DoE) based on data collected and research performed during 2010. In the report, DoE describes plans to: (1) develop its first integrated research agenda addressing critical materials, building on three technical workshops convened by the DoE during November and December 2010; (2) strengthen its capacity for information-gathering on this topic; and (3) work closely with international partners, including Japan and Europe, to reduce vulnerability to supply disruptions and address critical material needs. Charts and tables. This is a print on demand report.
Author:
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ISBN:
Category : Science
Languages : en
Pages : 1032
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Author: Mahmoud Khalifeh
Publisher: Springer Nature
ISBN: 3030399702
Category : Technology & Engineering
Languages : en
Pages : 285
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This open access book offers a timely guide to challenges and current practices to permanently plug and abandon hydrocarbon wells. With a focus on offshore North Sea, it analyzes the process of plug and abandonment of hydrocarbon wells through the establishment of permanent well barriers. It provides the reader with extensive knowledge on the type of barriers, their functioning and verification. It then discusses plug and abandonment methodologies, analyzing different types of permanent plugging materials. Last, it describes some tests for verifying the integrity and functionality of installed permanent barriers. The book offers a comprehensive reference guide to well plugging and abandonment (P&A) and well integrity testing. The book also presents new technologies that have been proposed to be used in plugging and abandoning of wells, which might be game-changing technologies, but they are still in laboratory or testing level. Given its scope, it addresses students and researchers in both academia and industry. It also provides information for engineers who work in petroleum industry and should be familiarized with P&A of hydrocarbon wells to reduce the time of P&A by considering it during well planning and construction.
Author:
Publisher:
ISBN:
Category : Power (Mechanics)
Languages : en
Pages : 858
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