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Previous issue date: 2015-08-27 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico (CNPq) / Os fluidos de perfura??o base ?leo s?o utilizados em situa??es nas quais se requer caracter?sticas especiais, tais como as exigidas na perfura??o da camada Pr?-sal. Para o desenvolvimento de uma nova formula??o de fluido base ?leo foi escolhida a microemuls?o devido a sua maior estabilidade frente ?s emuls?es tradicionalmente utilizadas. Os fluidos foram preparados utilizando-se uma composi??o de microemuls?o (Winsor IV) definida atrav?s de diagrama de fases tern?rio constitu?do por ?leo de soja, ?lcool laur?co trietoxilado e ?gua salina. A este sistema microemulsionado adicionou-se bentonita s?dica modificada por brometo de hexadecil trimetil am?nio e baritina. A etapa de modifica??o da argila foi realizada utilizando-se tr?s diferentes concentra??es de tensoativo cati?nico com o objetivo de tornar poss?vel a dispers?o da argila em meio org?nico. Foi realizado um planejamento fatorial 2? com triplicata do ponto central para avalia??o da influ?ncia da concentra??o de tensoativo hexadecil trimetil am?nio na organofiliza??o da argila, da concentra??o de viscosificante na composi??o do fluido de perfura??o e da temperatura atrav?s das vari?veis respostas obtidas. As an?lises reol?gicas forneceram resultados de viscosidade pl?stica, viscosidade aparente, tixotropia e limite de escoamento. A partir destes resultados, determinou-se a formula??o de um fluido de perfura??o e este foi caracterizado atrav?s de ensaios reol?gicos. Os resultados mostraram que a adsor??o dos c?tions quatern?rios de am?nio na superf?cie da argila foi significativa e apresentou mais efici?ncia utilizando-se concentra??o de tensoativo acima da concentra??o micelar cr?tica. O estudo do efeito das vari?veis independentes mostrou que a temperatura ? o fator mais influente nas propriedades reol?gicas do fluido preparado. / The oil based drilling fluids are used in situations which require special characteristics such as high pressures and high temperatures required in drilling Pre-salt. For the development of a new formulation based fluid oil microemulsion was chosen due to its greater stability in the emulsion traditionally used. The fluids were prepared using a composition of the microemulsion (Winsor IV) defined by the ternary phase diagram consisting of soybean oil, lauryl alcohol trietoxilado and brine. In this microemulsion system was added sodium bentonite modified hexadecyl trimethyl ammonium bromide and barytes. The clay modification step was performed using three different concentrations of cationic surfactant in order to make possible the clay dispersion in organic medium. To evaluate the surface modification of clays were carried out the surface tension analysis and wettability analysis soybean oil, with the advance angle determination. To assist in implementation and processing of the data used a factorial design 2? with the center point triplicate to evaluate the influence of the concentration of hexadecyl trimethyl ammonium surfactant in organophilization clay, the viscosifying concentration in the drilling fluid composition and temperature by the variables obtained responses. Rheological analysis provided plastic viscosity results, apparent viscosity, thixotropy and yield strength. The modified clay was measured as a function of contact angle and the results showed that there was a decrease in the contact angle as larger amounts of quaternary ammonium cations were adsorbed on clay surface, suggesting increased affinity for oil soybeans. The study of the effect of independent variables showed that temperature is the most influential factor in therheological properties of the prepared fluid.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/20415 |
| Date | 27 August 2015 |
| Creators | Ratkievicius, Luciana Avelino |
| Contributors | 59545844434, http://lattes.cnpq.br/2811639726261017, Melo, Klismeryane Costa de, 03444622422, http://lattes.cnpq.br/4874791052449347, Santanna, Vanessa Cristina, 77938780430, http://lattes.cnpq.br/9445575768909084, Barros Neto, Eduardo Lins de |
| Publisher | Universidade Federal do Rio Grande do Norte, PROGRAMA DE P?S-GRADUA??O EM ENGENHARIA QU?MICA, UFRN, Brasil |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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