Orientador: Takaaki Ohishi / Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Elétrica e de Computação / Made available in DSpace on 2018-08-21T21:12:08Z (GMT). No. of bitstreams: 1 Blande_ValterSouza_M.pdf: 5993109 bytes, checksum: 95c8d39a291faf2af9764174c116a7f9 (MD5) Previous issue date: 2012 / Resumo: Esta dissertação apresenta um sensor e um estudo teórico para otimização e monitoramento em tempo real da produção bruta de poços de petróleo operados com o sistema artificial de elevação GLI (Gás Lift Intermitente). O trabalho aborda desde a conceituação do ambiente de pesquisa ate o desenvolvimento de instrumentação para instalação em poços de petróleo, começando com a modelagem teórica e levantamento da função de produção de um poço terrestre operado com GLI, propondo em seguida um modelo de calculo de produção estimada em tempo real através do uso de instrumentação especialmente desenvolvida para este modelo e, finalmente, apresenta o projeto de hardware de um sensor capacitivo que viabiliza a aplicação do modelo de calculo de produção estimada em poços terrestres operados com GLI através da medição da impedância no tempo de tubulações onde ha escoamento de óleo, água e gás / Abstract: This thesis presents a sensor and a theoretical study to monitor and optimize the oil wells production with artificial lifting IGL (intermittent gas lift). The work begins with an introduction to oil well production concepts and the sensor development motivation. A theoretic model for IGL wells production is proposed in order to get an IGL well production curve. Then an estimated calculus for the oil well production measurement in real time is presented with the capacitive sensor which measures the flow impedance at time, especially designed for this purpose. Finally, the impedance sensor is presented as a measurement instrument for oil flow applications related to the flow impedance measurement at time in two phase flow / Mestrado / Energia Eletrica / Mestre em Engenharia Elétrica

>Magister Scientiae - MSc / The Bredasdorp Basin is located on the southern continental margin, off the coast of South Africa. It is mostly filled by marine Aptian to Maastrichtian deposits, overlaying pre-existing Late Jurassic to Early Cretaceous fluvial and shallow marine synrift deposits. The basin is a southeastern trending rift basin, located between the Columbine-Agulhas and Infanta arches. Its basement is made up of slates of the Bokkeveld Group (Devonian) and or quartzites of the Table Mountain Group (Ordovician-Silurian). The study area extends from X-X field to Y-Y field and encompasses only four wells for this investigation; well A, B, C and D respectively. This study was done through the interpretation; integration and juxtaposing of the results from core analysis with wireline log analysis (gamma ray) using Petrel software to display and correlate the well logs. Through core analysis which is the main source of information for this study, seven facies were identified and interpreted for the entire study. These facies alternate throughout each well and between different wells, but they are not evident in all the cores. Throughout the study, well A has been used as a reference well, since it appears (according to the interpretations) to record all seven facies and has the thickest section of zone 3. This zone reflects more accommodation space than the other studied wells at the time of deposition. Facies analysis of cores and well log correlation provide evidence that the studied USM sandstones are compatible with a wave dominated estuary/island-bar lagoon system to shoreface of a wave dominated marine shelf. It has previously been demonstrated that on the northern shelf of the Bredasdorp Basin, the USM typically has an hour-glass gamma ray log signature as a result of long-term transgression and regression and this typical log shape was also identified in this study from well A .

Staples theory has been used as a framework to explain the historical establishment and political economy of Canada and other “new” countries, based on the concept that Canada has been and continues to be built on an economy of resource extraction. The theory has been applied on both a macro and a micro scale to regions of Canada that have specialized in the extraction of cod, wheat, fur, and oil and gas. Two foundational academics of staples theory, Harold A. Innis and Mel Watkins, spent time in the northern region of Canada now known as the Northwest Territories (NWT) and, among other researchers, applied a staples approach to various periods of the region’s economic development. The application of staples theory in northern Canada, however, is problematic, particularly in view of the territory’s predominantly Indigenous, Inuit, and Métis population. A staples framework tends to ignore, or underplay, a fundamental reality in the NWT: the original political economy of the region was based on Indigenous values of communal trading and sharing in a subsistence economy. Most importantly, the Indigenous economy was controlled and distributed by the Indigenous people as they lived on, and carefully managed, the land and resources of the North. A theoretical approach that centers on the extraction and commodification of resources in the North by white traders and settlers who take over the land, obscures the critical questions of who owns and cares for the land and how it is ‘developed’. / Graduate

No description available.

Group- III nitride based semiconductors have emerged as the leading material for short wavelength optoelectronic devices. The InGaN alloy system forms a continuous and direct bandgap semiconductor spanning ultraviolet (UV) to blue/green wavelengths. An ideal and highly efficient light-emitting device can be designed by enhancing the spontaneous emission rate. This thesis deals with the design and fabrication of a visible light-emitting device using GaN/InGaN single quantum well (SQW) system with enhanced spontaneous emission. To increase the emission efficiency, layers of different metals, usually noble metals like silver, gold and aluminum are deposited on GaN/InGaN SQWs using metal evaporator. Surface characterization of metal-coated GaN/InGaN SQW samples was carried out using atomic force microscopy (AFM) and scanning electron microscopy (SEM). Photoluminescence is used as a tool for optical characterization to study the enhancement in the light emitting structures. This thesis also compares characteristics of different metals on GaN/InGaN SQW system thus allowing selection of the most appropriate material for a particular application. It was found out that photons from the light emitter couple more to the surface plasmons if the bandgap of former is close to the surface plasmon resonant energy of particular metal. Absorption of light due to gold reduces the effective mean path of light emitted from the light emitter and hence quenches the quantum well emission peak compared to the uncoated sample.

This thesis is a study of a home beautification project developed by the Art Club of the Travis Elementary School in Mineral Wells, Texas.

>Magister Scientiae - MSc / The study area for this thesis focuses on the central northern part of the Bredasdorp Basin of southern offshore South Africa, where the depositional environments of wells E-M1, E-M3 and E-AB1 were inferred through electro sequence analysis and sequence stratigraphy analysis of the corresponding seismic line (E82-005). For that, the Petroleum Agency of South Africa (PASA) allowed access to the digital data which were loaded onto softwares such as PETREL and Kingdom SMT for interpretational purposes. The lithologies and sedimentary environments were inferred based on the shape of the gamma ray logs and reported core descriptions. The sequence stratigraphy of the basin comprises three main tectonic phases: Synrift phase, Transitional phase and Drift phase. Syn-rift phase, which began in the Middle Jurassic during a period of regional tectonism, consists of interbedded red claystones and discrete pebbly sandstone beds deposited in a non-marine setting. The syn-rift 1 succession is truncated by the regional Horizon ‘C’ (1At1 unconformity). The transitional phase was influenced by tectonic events, eustatic sea-level changes and thermal subsidence and characterized by repeated episodes of progradation and aggradation between 121Ma to 103Ma, from the top of the Horizon ‘C’ (1At1 unconformity) to the base of the 14At1 unconformity. Finally the drift phase was driven by thermal subsidence and marked by the Middle Albian14At1 unconformity which is associated with deep water submarine fan sandstones. During the Turonian (15At1 unconformity), highstand led to the deposition of thin organic-rich shales. In the thesis, it is concluded that the depositional environment is shallow marine, ranging from prograding marine shelf, a transgressive marine shelf and a prograding shelf edge delta environment.

En esta investigación se presenta el análisis del costo de construcción e instalación del pozo de bombeo tipo tubular y la eficiencia de este mismo, en zonas susceptibles a licuación de suelos, para reducir su vulnerabilidad sísmica. Las zonas susceptibles, se determinaron con el cálculo del factor de seguridad del potencial de licuación de Seed e Idriss. En la etapa inicial, sin la instalación de los pozos, el FS resultó menor a la unidad (FS<1), ya que, la zona de estudio presenta nivel freático superficial. El mismo, que tiene una alta incidencia en la ocurrencia de licuación, debido a que se genera una excesiva presión de poros originada por los sismos que reducen los esfuerzos efectivos del suelo hasta hacerlos nulo. Con ello, el suelo pierde toda resistencia. Con la instalación de pozos, se logró incrementar el FS por encima de la unidad (FS>1). Para ello fue necesario la instalación de 4 pozos tubulares, con caudal de bombeo unitario de 20 litros/seg y una profundidad de 3.0 m, para un área de 1.20 Ha. La profundidad de los pozos y el caudal de bombeo deberá garantizar el abatimiento del nivel freático por encima de la profundidad óptima para que se mitigue la licuación de suelos. Finalmente, costo de construcción e instalación de los pozos, asciende a $. 14,270.90 dólares. / This research presents the analysis of the cost of construction and installation of the tubular type pumping well and its efficiency, in areas susceptible to soil liquefaction, to reduce its seismic vulnerability. The susceptible areas were determined with the calculation of the safety factor of the liquefying potential of Seed and Idriss. In the initial stage, without the installation of the wells, the FS was less than unity (FS <1), since the study area has a surface water table. The same, which has a high incidence in the occurrence of liquefaction, due to the excessive pore pressure generated by earthquakes that reduce the effective stresses of the soil until they are null. With this, the ground loses all resistance. With the installation of wells, it was possible to increase the FS above the unit (FS> 1). For this, it was necessary to install 4 tubular wells, with a unit pumping flow of 20 liters / sec and a depth of 3.0 m, for an area of ​​1.20 Ha. The depth of the wells and the pumping flow should guarantee the abatement of the water table above the optimal depth to mitigate the liquefaction of soils. Finally, the cost of construction and installation of the wells amounts to $. $ 14,270.90. / Trabajo de investigación

The development of artesian and pumped wells as a source of irrigation water has created the need for a measuring device which will be accurate for small discharges. The thin edged weir has been accepted as one of the most accurate and desirable measuring devices for this work. Three types of weirs are now commonly used: the Rectangular, the Cipolleti, and the Triangular Notch weir. Of these types the triangular notch is probably the best suited for small discharges (under 3 second feet). The various formulae for discharge over 90% Triangular weirs have been accurately determined for heads over two tenths of a foot. It is the purpose of this investigation to determine the coefficients for use in the general formula for discharge resulting from heads under 0.3 foot.

In this work, ordered all-binary short-period strained InAs/GaAs superlattice quantum wells were studied as an alternative to strained ternary alloy InGaAs/GaAs quantum wells. InGaAs quantum wells QWs have been of great interest in recent years due to the great potential applications of these materials in future generations of electronic and optoelectronic devices. The all binary structures are expected to have all the advantages of their ternary counterparts, plus several additional benefits related to growth, to the elimination of alloy disorder scattering and to the presence of a higher average indium content.