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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
21

Estudo do processo de drenagem gravitacional assistido por vapor utilizando po?os injetores verticais e horizontais na recupera??o de ?leos pesados

Rocha, Marcel Ara?jo 14 March 2016 (has links)
Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2017-01-13T12:25:48Z No. of bitstreams: 1 MarcelAraujoRocha_DISSERT.pdf: 5011334 bytes, checksum: d4996c7516aeda7455db92bc1ebfc1d5 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2017-01-23T13:23:05Z (GMT) No. of bitstreams: 1 MarcelAraujoRocha_DISSERT.pdf: 5011334 bytes, checksum: d4996c7516aeda7455db92bc1ebfc1d5 (MD5) / Made available in DSpace on 2017-01-23T13:23:05Z (GMT). No. of bitstreams: 1 MarcelAraujoRocha_DISSERT.pdf: 5011334 bytes, checksum: d4996c7516aeda7455db92bc1ebfc1d5 (MD5) Previous issue date: 2016-03-14 / A explora??o de reservas de hidrocarbonetos pesados e extrapesados ? de interesse primordial para muitas companhias de petr?leo, uma vez que, a magnitude desses recursos representa parte da energia mundial. A produ??o de ?leo pesado, a partir de dep?sitos subterr?neos, ? complexa, at? mesmo sob as melhores circunst?ncias, devido principalmente ? elevada viscosidade do ?leo. Para melhor desenvolver o processo de produ??o, tornando-o eficiente, de maneira que os fluidos que n?o seriam produzidos consigam chegar ? superf?cie, foram desenvolvidos m?todos de recupera??o convencionais e especiais, para obten??o de um maior fator de recupera??o e, consequentemente, uma maior lucratividade na opera??o de explota??o dessas jazidas. Para reduzir a alta viscosidade e as elevadas tens?es interfaciais, foram desenvolvidos os m?todos t?rmicos. Nesse trabalho, simulou-se a inje??o continua de vapor, com po?os injetores verticais e horizontais, para desenvolver um reservat?rio com caracter?sticas do Nordeste brasileiro, de ?leo pesado, atrav?s da condu??o dos fluidos produzidos com po?o horizontal. Foram feitas an?lises t?cnicas e econ?micas dos modelos que diferiam quanto ?s suas restri??es e arranjos estruturais do sistema. Na configura??o horizontal se observou a influ?ncia da vaz?o de inje??o, da dist?ncia vertical e da dist?ncia lateral sobre o fator de recupera??o. Na configura??o vertical se analisou a influ?ncia da vaz?o de inje??o, da completa??o dos injetores, da dist?ncia lateral e da quantidade de po?os injetores sobre o fator de recupera??o. Diante dos modelos proposto, analisou-se a produ??o acumulada de ?leo, o Volume Poroso Injetado, a forma??o das c?maras de vapor e o Valor Presente L?quido. Tecnicamente, os modelos em que se injetou vapor com po?os verticais obtiveram maior fator de recupera??o de ?leo, j? os modelos horizontais se sobressa?ram economicamente. / The reserves exploration of heavy and extra heavy hydrocarbon is of prime interest to many oil companies, since the magnitude of these resources the magnitude of these resources still stands out on the global and Brazilian energy matrix. The production of heavy oil, from the underground deposits is complex, even on the best of circumstances, mainly due to the high viscosity of the oil. To further develop the process of production, making it efficient, so that the fluids that would not be produced get to reach the surface, complementary recovery methods and advanced were developed to obtain a higher recovery factor and, hence, greater profitability in operation exploitation of these deposits. To combat the high viscosity and high interfacial tensions, thermal methods were developed. In this work, the steam injection continues was simulated in vertical and horizontal injection wells, to develop a reservoir with characteristics of the Brazilian Northeast of heavy oil, by conducting fluid produced with horizontal well. Technical and economic analyzes were made of the models that differ in their structural constraints and system arrangements. In horizontal configuration was observed the influence of the injection flow, of the vertical distance and of the lateral distance over the recovery factor. In vertical configuration was analyzed the influence of the injection flow, of the injection wells completion, of the lateral distance and the amount of injection wells over the recovery factor. Faced the proposed models, was analyzed the cumulative oil production, the Pore Volume Injected, the formation of steam chambers and the Net Present Value. Technically, the models in which steam is injected with vertical wells had higher recovery factor of oil, since the horizontal models stood out economically.
22

Estudo de caso acerca da utilização de métricas de gestão baseada em valor na análise da viabilidade econômico financeira de projetos de investimento

Lucheses, Giovanni dos Reis 05 December 2011 (has links)
Submitted by Giovanni Lucheses (giovannirl@fgv.br) on 2012-07-16T15:39:17Z No. of bitstreams: 1 Dissertação_Vfinal.pdf: 523797 bytes, checksum: 51c0f0c8eb514cda94eda8cafb770be5 (MD5) / Approved for entry into archive by Janete de Oliveira Feitosa (janete.feitosa@fgv.br) on 2012-07-16T17:55:25Z (GMT) No. of bitstreams: 1 Dissertação_Vfinal.pdf: 523797 bytes, checksum: 51c0f0c8eb514cda94eda8cafb770be5 (MD5) / Approved for entry into archive by Marcia Bacha (marcia.bacha@fgv.br) on 2012-07-23T18:28:14Z (GMT) No. of bitstreams: 1 Dissertação_Vfinal.pdf: 523797 bytes, checksum: 51c0f0c8eb514cda94eda8cafb770be5 (MD5) / Made available in DSpace on 2012-07-23T18:28:37Z (GMT). No. of bitstreams: 1 Dissertação_Vfinal.pdf: 523797 bytes, checksum: 51c0f0c8eb514cda94eda8cafb770be5 (MD5) Previous issue date: 2011-12-05 / O presente estudo de caso investiga a possibilidade de utilização de métricas de gestão de valor na análise econômica de projetos de investimento e, por consequência, objetiva auxiliar no processo de tomada de decisões acerca de investimentos. Para tal, o arcabouço teórico fundamenta-se na teoria de gestão baseada em valor e análises tradicionais de avaliação de projetos de investimentos. O objetivo é verificar a aderência entre as ferramentas tradicionais (VPL – valor presente líquido) e as novas, baseadas em valor (EVA – valor econômico agregado, CVA - valor adicionado base caixa), amplamente utilizadas para medir o desempenho empresarial. / This case study investigates the possibility of using value management metrics in economic analysis of investment projects and, therefore, aims to assist investment decision making. To this end, the theoretical framework is based on value based management theory and traditional assessment analysis of investment projects. The goal is to check the adhesion between the traditional tools (NPV – net present value) and the new ones, which are value-based (EVA - economic value added, CVA – cash value added) and widely used to measure business performance.
23

Are real options a real option for real-world finance professionals? Case study: the application of real options to evaluate investment projects in the latin american oil and gas field services industry

Russo, Marcelo Moreira 13 December 2012 (has links)
Submitted by Marcelo Moreira Russo (marcelo_m_russo@yahoo.com) on 2013-01-11T00:33:15Z No. of bitstreams: 1 20130110-Dissertacao-Real Option_Marcelo Russo.pdf: 1191678 bytes, checksum: a84358a46e9372d37389260fc8dbf38f (MD5) / Approved for entry into archive by Eliene Soares da Silva (eliene.silva@fgv.br) on 2013-01-11T12:56:21Z (GMT) No. of bitstreams: 1 20130110-Dissertacao-Real Option_Marcelo Russo.pdf: 1191678 bytes, checksum: a84358a46e9372d37389260fc8dbf38f (MD5) / Made available in DSpace on 2013-01-11T13:07:53Z (GMT). No. of bitstreams: 1 20130110-Dissertacao-Real Option_Marcelo Russo.pdf: 1191678 bytes, checksum: a84358a46e9372d37389260fc8dbf38f (MD5) Previous issue date: 2012-12-13 / Brazil and other emerging markets will continue to present many investment opportunities in the coming years. Finance professionals who manage the company’s capital budgeting processes will face challenges. Specific characteristics of these projects as commodity-linked prices (e.g., the case of oil and gas and agricultural projects) and the customary uncertainties related to emerging markets are additional challenges. In this scenario, a more sophisticated capital budgeting framework, Real Options, offers a more robust theory to deal with uncertainty, managerial flexibility, and volatile outcomes imbedded in these opportunities. Real Options theory assumes that the managers’ involvement in the project generates value so they might capitalize on good outcomes or reduce losses by abandoning projects with bad results. The primary objective of this research was to apply Real Options valuation analysis for an investment project valuation and discuss the process and the results of such methodology. The case study retroactively analyzed an investment project in Colombia and compared the results under traditional NPV methodology and Real Options. The valuation techniques were performed as if they had been applied at the time the project was approved and then compared with the project's actual performance. The case study evaluated two types of real options: first, the effect of an option to cancel a contract that is assessed from the perspective of the client; and second, the option to abandon and defer from the perspective of the company that will perform the investment. / Brasil e outros mercados emergentes continuarão a apresentar muitas oportunidades de investimento nos próximos anos. Profissionais financeiros que gerenciam os processos de orçamento de capital nas empresas terão grandes desafios a enfrentar. Características específicas destes projetos como preços ligados a commodities (por exemplo: petróleo e gás e projetos agrícolas) e as incertezas habituais relacionadas com os mercados emergentes são desafios adicionais. Neste cenário, ferramentas mais sofisticadas de orçamento de capital como Opções Reais, oferece uma teoria mais robusta para lidar com incerteza, flexibilidade gerencial, e os resultados voláteis embutidas nestas oportunidades. A teoria de Opções Reais assume que o envolvimento dos gestores nos projetos gera valor à medida que potencializam os bons resultados ou reduzem as perdas por abandonar projetos com maus resultados. O objetivo principal desta pesquisa foi aplicar a análise de Opções Reais para um projeto de investimento e discutir o processo e os resultados da metodologia. O estudo de caso analisa retroativamente um projeto de investimento na Colômbia e compara os resultados sob o tradicional VPL e Opções Reais. As técnicas de avaliação foram realizadas como se estivessem sendo aplicadas no momento em que o projeto foi aprovado, e depois comparadas com o desempenho real do projeto. O estudo de caso avaliado possui dois tipos de Opções Reais: primeiro, o efeito de uma opção para cancelar um contrato que é analisado a partir da perspectiva do cliente que pode exercer essa opção, e o segundo, a opção de abandonar e adiar a partir da perspectiva da empresa que irá executar a investimento.
24

On the Treatment of Noise and Conspiring Bias in Dual-Frequency Differential Global Navigation Satellite Systems

Bruckner, Dean C. 16 April 2010 (has links)
No description available.

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