Experimental Study And Numerical Simulation Of Hydraulic Fracturing Tight Sandstone Reservoirs,
2015
Missouri University of Science and Technology
Experimental Study And Numerical Simulation Of Hydraulic Fracturing Tight Sandstone Reservoirs, Chaohua Guo, Jianchun Xu, Mingzhen Wei, Ruizhong Jiang
Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works
Unconventional tight sandstone reservoirs have been developed during recent years and a large number of multi-stages fractured horizontal wells have been drilled to stimulate reservoir performance. However, fluid flow in low permeability porous media no longer obeys Darcy's law and instead conforms to low-velocity non-Darcy flow. Most commercial numerical simulation software for multi-stage fractured horizontal well development may cause inaccuracy in simulating performance of tight sandstone reservoirs. In this paper, the investigation of existing conditions of low velocity non-Darcy flow for oil flow in irreducible water saturation tight sandstone cores was conducted and discussed through lab-experiments. And existence of low …
The Impact Of Mpowir A Decade Of Investing In Mentoring Women In Physical Oceanography,
2015
Duke University
The Impact Of Mpowir A Decade Of Investing In Mentoring Women In Physical Oceanography, Sarah Clem, Sonya Legg, Susan Lozier, Colleen B. Mouw
Michigan Tech Publications, Part 1
MPOWIR (Mentoring Physical Oceanography Women to Increase Retention) is a US communityinitiated and community-led mentoring program aimed at improving the retention of women physical oceanographers in academic and/or research positions. This article describes the MPOWIR program elements designed by the US physical oceanography community, quantifies the participation in these programs, describes MPOWIR’s impact to date, and outlines future directions. An examination of surveys to date indicates that MPOWIR, several years after its implementation, is having a positive impact on the retention of junior women in physical oceanography, primarily by giving them a broad professional network and focused mentoring.
Characterising Volcanic Cycles At Soufriere Hills Volcano, Montserrat: Time Series Analysis Of Multi-Parameter Satellite Data,
2015
Michigan Technological University
Characterising Volcanic Cycles At Soufriere Hills Volcano, Montserrat: Time Series Analysis Of Multi-Parameter Satellite Data, Verity Flower, Simon Carn
Michigan Tech Publications, Part 1
The identification of cyclic volcanic activity can elucidate underlying eruption dynamics and aid volcanic hazard mitigation. Whilst satellite datasets are often analysed individually, here we exploit the multi-platform NASA A-Train satellite constellation to cross-correlate cyclical signals identified using complementary measurement techniques at Soufriere Hills Volcano (SHV), Montserrat. In this paper we present a Multi-taper (MTM) Fast Fourier Transform (FFT) analysis of coincident SO2 and thermal infrared (TIR) satellite measurements at SHV facilitating the identification of cyclical volcanic behaviour. These measurements were collected by the Ozone Monitoring Instrument (OMI) and Moderate Resolution Imaging Spectroradiometer (MODIS) (respectively) in the A-Train. We identify …
Caracterización De Las Propiedades Indices De Los Flujos De Lodos En 3 Km2 De La Ladera Oriental De La Ciudad De Medellín,
2015
Universidad de Antioquia
Caracterización De Las Propiedades Indices De Los Flujos De Lodos En 3 Km2 De La Ladera Oriental De La Ciudad De Medellín, Juan Camilo Viviescas, Juan Pablo Osorio
Conference papers
La caracterización de las propiedades índices de los geomateriales es una de las labores más importantes en la ingeniería geotécnica, al ser estos un insumo fundamental para la identificación y determinación de propiedades geomecánicas de los suelos. Las principales propiedades índices estudiadas en la geotecnia son el contenido de agua, los límites de Atterberg, la granulometría, el peso unitario y la gravedad específica, las cuales son la base para clasificación de suelos. En este artículo se presenta el análisis estadístico de las propiedades índices de suelos tipo flujo de lodos de la ladera oriental de Medellín, a partir del análisis …
Propiedades Geotécnicas De La Turba Intervenida Antrópicamente,
2015
Technological University Dublin
Propiedades Geotécnicas De La Turba Intervenida Antrópicamente, Juan Pablo Osorio
Conference papers
La intervención antrópica en turberas genera cambios significativos en las propiedades geotécnicas de un material orgánico, altamente compresible y con baja resistencia al esfuerzo cortante. Existen diferentes formas de intervención, dependiendo de las tradiciones de cada lugar. Sin embargo, los procesos de intervención más comunes son la precarga por medio de terraplenes y el drenaje, las cuales generan una reducción en el contenido de humedad, la compresibilidad y la permeabilidad, así como un incremento en la resistencia al esfuerzo cortante. En el presente artículo, se discute el efecto de la intervención antrópica en las propiedades geotécnicas de las turbas, a …
Capturing Optically Important Constituents And Properties In A Marine Biogeochemical And Ecosystem Model,
2015
Massachusetts Institute of Technology
Capturing Optically Important Constituents And Properties In A Marine Biogeochemical And Ecosystem Model, S. Dutkiewicz, A. E. Hickman, O. Jahn, W. W. Gregg, C. B. Mouw, M. J. Follows, C. Mouw
Michigan Tech Publications, Part 1
We present a numerical model of the ocean that couples a three-stream radiative transfer component with a marine biogeochemical-ecosystem component in a dynamic three-dimensional physical framework. The radiative transfer component resolves the penetration of spectral irradiance as it is absorbed and scattered within the water column. We explicitly include the effect of several optically important water constituents (different phytoplankton functional types; detrital particles; and coloured dissolved organic matter, CDOM). The model is evaluated against in situ-observed and satellite-derived products. In particular we compare to concurrently measured biogeochemical, ecosystem, and optical data along a meridional transect of the Atlantic Ocean. The …
A Geologic Play Book For Utica Shale Appalachian Basin Exploration,
2015
Kentucky Geological Survey
A Geologic Play Book For Utica Shale Appalachian Basin Exploration, John Hickman, Cortland Eble, Ronald A. Riley, Matthew Erenpreiss, Kristin M. Carter, John A. Harper, Brian Dunst, Langhorne “Taury” Smith, Michele L. Cooney, Daniel Soeder, Garrecht Metzger, Jessica Moore, Michael E. Hohn, Susan Pool, John Saucer, Douglas G. Patchen
Appalachian Oil and Natural Gas Research Consortium
This “Geologic Play Book for Utica Shale Appalachian Basin Exploration” (hereafter referred to as the “Utica Shale Play Book Study” or simply “Study”) represents the results of a two-year research effort by workers in five different states with the financial support of fifteen oil and gas industry partners. The Study was made possible through a coordinated effort between the Appalachian Basin Oil & Natural Gas Research Consortium (AONGRC) and the West Virginia University Shale Research, Education, Policy and Economic Development Center.
Seasonal Variability Of Atmospheric Nitrogen Oxides And Non-Methane Hydrocarbons At The Geosummit Station, Greenland,
2015
Michigan Technological University
Seasonal Variability Of Atmospheric Nitrogen Oxides And Non-Methane Hydrocarbons At The Geosummit Station, Greenland, L. J. Kramer, D. Helmig, J. F. Burkhart, A. Stohl, S. Oltmans, R. E. Honrath
Michigan Tech Publications, Part 1
Measurements of atmospheric nitrogen oxides NOx (NOx = NO + NO2), peroxyacetyl nitrate (PAN), NOy, and non-methane hydrocarbons (NMHC) were taken at the Greenland Environmental Observatory at Summit (GEOSummit) station, Greenland (72.34° N, 38.29° W; 3212 m a.s.l.), from July 2008 to July 2010. The data set represents the first year-round concurrent record of these compounds sampled at a high latitude Arctic site. Here, the study focused on the seasonal variability of these important ozone (O3) precursors in the Arctic troposphere and the impact from transported anthropogenic and biomass burning emissions. Our analysis shows that PAN is the dominant NOy …
Spatial Analysis Of Mount St. Helens Tephra Leachate Compositions: Implications For Future Sampling Strategies,
2015
Ludwig-Maximilians-Universität München
Spatial Analysis Of Mount St. Helens Tephra Leachate Compositions: Implications For Future Sampling Strategies, P. M. Ayris, P. Delmelle, B. Pereira, E. C. Maters, D. E. Damby, A. J. Durant, D. B. Dingwell
Michigan Tech Publications, Part 1
Tephra particles in physically and chemically evolving volcanic plumes and clouds carry soluble sulphate and halide salts to the Earth’s surface, ultimately depositing volcanogenic compounds into terrestrial or aquatic environments. Upon leaching of tephra in water, these salts dissolve rapidly. Previous studies have investigated the spatial and temporal variability of tephra leachate compositions during an eruption in order to gain insight into the mechanisms of gas-tephra interaction which emplace those salts. However, the leachate datasets analysed are typically small and may poorly represent the natural variability and complexity of tephra deposits. Here, we have conducted a retrospective analysis of published …
A More Superior Preformed Particle Gel With Potential Application For Conformance Control In Mature Oilfields,
2015
Missouri University of Science and Technology
A More Superior Preformed Particle Gel With Potential Application For Conformance Control In Mature Oilfields, Paul Tongwa, Baojun Bai
Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works
The present work presents a nanocomposite preformed particle gel for conformance control in mature oilfields. This product was observed to have a better performance than conventional hydrogels without nanomaterials. Preformed particle hydrogel was designed by the reaction of monomer, initiator, crosslinker, additives, and calcium montmorillonite nanomaterial, whereas conventional hydrogel is designed from just monomer, initiator, crosslinker and additives. The presence of nanomaterial in hydrogel design affords it tremendous improvement in nanocomposite gel properties and behavior compared to conventional hydrogels without any nanomaterial. Additionally, swelling performance, post-degraded gel viscosity, and long-term thermal resistance of nanocomposite gel increased by several orders of …
Evaluation Of Tunnel Excavation Methods In Accordance With Engineering Geology And Rock Mass Classification Systems,
2015
Missouri University of Science and Technology
Evaluation Of Tunnel Excavation Methods In Accordance With Engineering Geology And Rock Mass Classification Systems, Özgür Satici, Tamer Topal
Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works
In this study, the relationship between engineering geological applications and tunnel excavation methods were described. Even if several tunnel excavation methods have been suggested from past up to the present, most of them were only the various derivations of full face and sequential excavation techniques. Internationally well-known tunnel excavation methods try to classify rock mass behaviors but cannot form a numerical base for the claimed methods. Therefore, objective evaluations are required (especially for their applications) to overcome the deficits rock mass classification systems are used. NATM and ADECO-RS are the two widespread methods at the present-day tunnel practice. In both …
Microfracture And Surfactant Impact On Linear Cocurrent Brine Imbibition In Gas-Saturated Shale,
2015
Missouri University of Science and Technology
Microfracture And Surfactant Impact On Linear Cocurrent Brine Imbibition In Gas-Saturated Shale, Yongpeng Sun, Baojun Bai, Mingzhen Wei
Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works
During and after hydraulic fracturing, fluid-shale interaction has a prominent impact on liquid retention and thus on gas phase permeability and gas productivity. By providing a low surface tension or wettability alteration, surfactants are widely used to decrease liquid retention after fracturing. To evaluate the liquid intake of a rock sample, an imbibition experiment is commonly used, especially when it is treated by a surfactant. However, conventional imbibition experiments with gas shale could not quantitate the imbibition behaviors as it does with conventional rocks because of the low porosity and extremely low permeability of gas shale. In this paper, a …
Stratospheric Volcanic Ash Emissions From The 13 February 2014 Kelut Eruption,
2015
Norsk institutt for luftforskning
Stratospheric Volcanic Ash Emissions From The 13 February 2014 Kelut Eruption, N. I. Kristiansen, A. J. Prata, A. Stohl, S. A. Carn
Michigan Tech Publications, Part 1
Mount Kelut (Indonesia) erupted explosively around 15:50 UT on 13 February 2014 sending ash and gases into the stratosphere. Satellite ash retrievals and dispersion transport modeling are combined within an inversion framework to estimate the volcanic ash source term and to study ash transport. The estimated source term suggests that most of the ash was injected to altitudes of 16-17km, in agreement with space-based lidar data. Modeled ash concentrations along the flight track of a commercial aircraft that encountered the ash cloud indicate that it flew under the main ash cloud and encountered maximum ash concentrations of 9±3mgm-3, mean concentrations …
Multistage Concentration Of Cenospheres In Fly Ash Using The Inverted Reflux Classifier,
2015
Centre for Advanced Particle Processing and Transport, Newcastle Institute for Energy and Resources, University of Newcastle, Callaghan, NSW 2308, Australia
Multistage Concentration Of Cenospheres In Fly Ash Using The Inverted Reflux Classifier, A. Kiani, J. Zhou, K.P. Galvin
Coal Combustion and Gasification Products Journal Archive
Cenospheres are one of the most valuable components found in the fly ash waste of coal-fired power stations, consisting of hollow, aluminosilicate spherical shells and offering very low bulk density, high strength, and high thermal resistance. Although wet processing methods offer the best prospect for achieving recovery and concentration of the cenospheres, significant impediments remain for achieving satisfactory economics. This work was concerned with the recovery and concentration of cenospheres from fly ash using a novel system, the inverted reflux classifier (IRC), covering single and multistage processing. The system consists of a series of parallel inclined channels mounted underneath an …
Strengthening Black Cotton Soil With Fly Ash And Moorum: An Investigation Of The Role Of Subgrade And Subbase Layers,
2015
ITM University Raipur, New Raipur, Chhattisgarh 492001, India
Strengthening Black Cotton Soil With Fly Ash And Moorum: An Investigation Of The Role Of Subgrade And Subbase Layers, Gourav Saxena, Nikhlesh Chaurasia
Coal Combustion and Gasification Products Journal Archive
One of the most effective and economical methods to strengthen clayey soils is addition of stabilizing agents such as fly ash to the soil. In this study, highly plastic clay was stabilized using fly ash. Geotechnical properties such as Atterberg limits, unconfined compressive strength (UCS), and the California bearing ratio (CBR) value of virgin black cotton soil and soil treated with fly ash were evaluated. Soil was stabilized with various proportions of fly ash, i.e., at 0%, 10%, 15%, 20%, and 30%. The UCS of black cotton soil–fly ash mixes is found to be at its maximum at 20% fly …
Using Coal Fly Ash In Agriculture: Combination Of Fly Ash And Poultry Litter As Soil Amendments For Bioenergy Feedstock Production,
2015
Department of Agricultural and Environmental Sciences, Tennessee State University, Nashville, TN 37209, USA
Using Coal Fly Ash In Agriculture: Combination Of Fly Ash And Poultry Litter As Soil Amendments For Bioenergy Feedstock Production, E. Kudjo Dzantor, Ekundayo Adeleke, Vanaha Kankarla, Oluwatosin Ogunmayowa, Dafeng Hui
Coal Combustion and Gasification Products Journal Archive
Increasing fiscal, human, and environmental costs of coal fly ash (FA) management are leading to advocacy for greater beneficial uses of the by-products as soil amendments in agriculture. Greenhouse experiments were conducted in Armour silt loam (ASL) soil that was amended with FA (10%, wt/wt) with and without poultry litter (PL 5 75 mg N/kg). Biomass productivity of eastern gamagrass (GG), a warm-season perennial grass, was measured to serve as complementary biofuel feedstock to switchgrass (SG). FA was obtained from a site at the 2008 ash spill in Kingston, TN. GG and SG were grown individually in 15-cm-wide 3 41-cm-high …
Fabrication And Testing Of Low-Energy Calcium Sulfoaluminate-Belite Cements That Utilize Circulating Fluidized Bed Combustion By-Products,
2015
University of Kentucky Center for Applied Energy Research
Fabrication And Testing Of Low-Energy Calcium Sulfoaluminate-Belite Cements That Utilize Circulating Fluidized Bed Combustion By-Products, Robert Jewell, Robert Rathbone, Tristana Duvallet, Thomas Robl, Kamyar Mahboub
Coal Combustion and Gasification Products Journal Archive
The utilization of circulating fluidized bed combustion (CFBC) ash to make cement products that provide added value and offset CO2 production is the objective of this research. CFBC burns coal in the presence of a bed of slaked limestone, which effectively absorbs sulfur dioxide (SO2) to form anhydrite (CaSO4). CFBC produces two kinds of spent bed materials, coarse bottom ash and a much finer fly ash. Both of these products are very high in calcium. When properly conditioned, these materials are capable of acting as hydraulic cements, forming both calcium aluminosulfate minerals, most importantly ettringite, as well as calcium-alumina-silica gels, …
Prediction Of The Unburned Carbon Content Of Fly Ash In Coal-Fired Power Plants,
2015
Department of Mining and Nuclear Engineering, Missouri University of Science and Technology, Rolla, MO 65409-0450, USA
Prediction Of The Unburned Carbon Content Of Fly Ash In Coal-Fired Power Plants, Saeid R. Dindarloo, James C. Hower
Coal Combustion and Gasification Products Journal Archive
Prediction of carbon content in fly ash is a valuable index in both designing and optimizing coal-fired boilers. In this study, methods of multiple regression (MR), decision trees (DT), and support vector regression (SVR) were used for prediction of unburned carbon content of fly ash in a 300-MW power plant with a tangentially fired furnace using a low-NOx concentric firing system. Twenty-one boiler operational and coal petrological variables from 21 experiments in a previous benchmark study were used. A variables correlation matrix was used for feature (independent variables) selection in order to reduce the dimensions (number) of input variables from …
Recycling Of Lignite Coal Fly Ash By Its Conversion Into Zeolites,
2015
Department of Thermal and Nuclear Power Engineering, Technical University of Sofia, 8 Kliment Ohridski Blvd., 1000 Sofia, Bulgaria
Recycling Of Lignite Coal Fly Ash By Its Conversion Into Zeolites, Silviya Boycheva, Denitza Zgureva, Annie Shoumkova
Coal Combustion and Gasification Products Journal Archive
The present study emphasized the conversion of fly ash from lignite coals into zeolites by a double-stage fusion-hydrothermal synthesis. The raw and the converted fly ashes were characterized with respect to their morphology, composition, and crystallinity. The effects of process parameters such as fusion temperature, concentration of the alkaline activator, and the duration of the hydrothermal incubation on the zeolitization process were studied. The experimental results indicate that the fusion temperature does not influence the process mechanism in the range 550–850uC, but it has an acceleration effect. The elevation of the sodium hydroxide/fly ash ratio from 1.6 to 2.0 enhances …
Imaging Beneath Standing Bodies Of Water In Karst Terrain,
2015
Missouri University of Science and Technology
Imaging Beneath Standing Bodies Of Water In Karst Terrain, Abdulrahman Masfer Alotaibi
Doctoral Dissertations
"Side scan sonar and down scan sonar, sub bottom profiling, electrical resistivity tomography profiling (underwater cables), and continuous resistivity profiling (towed cable) surveys were conducted to characterize the lake sediments (rock and soil) beneath the man-made Little Prairie Lake, in central Missouri. Sub bottom profiling and electrical resistivity (with marine cables and towed cable) were used to determine variability in the lithology and thickness of sediments (soil and rock) beneath the lake, while side scan sonar was used to map the variations in the lithology/nature of exposed lakebed sediments and to locate the potential hazard of trees. Down scan sonar …
