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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.
1

Formula??o de grautes leves para a cimenta??o de po?os de petr?leo onshore

Gouveia, Priscila Siqueira de 25 July 2012 (has links)
Made available in DSpace on 2014-12-17T14:07:03Z (GMT). No. of bitstreams: 1 PriscilaSG_DISSERT.pdf: 2914308 bytes, checksum: 264d0eaf11deaccd2e57b10185cf49cb (MD5) Previous issue date: 2012-07-25 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / Grautes are dry mixes with hydraulic characteristics widely used in construction. This material comprises cement, mineral additives and dosed in accordance with the desired properties. The use of grautes in cementing oil wells potentially increases the precision in the composition of the mixture, since it is requires only the addition of the mixing water before its pumping. Such benefit may be availed in cementing wells since the formulations grautes meet the temperature and pressure characteristics typical of wells. The objective of this study is to evaluate the effect of adding different percentages of industrial minerals properties of light grautes for onshore oil wells. For the formulation of the employees were grautes light industrial minerals and waste minerals abundant in the Northeast, in addiction to Portland cement and chemical additives Special class. Grautes were formulated with densities between 1.55 g/cm3 (13.0 lb/gal) and 1.68 g/cm3 (14 lb/gal). Tests results showed that grautes with higher density in the range studied meet the specifications for cementation of shallow wells onshore. The compositions lighter can also be adjusted for applying the material in the cementation of oil wells / Grautes s?o misturas secas com caracter?sticas hidr?ulicas amplamente empregadas na constru??o civil. Este material ? constitu?do por cimento, minerais e aditivos dosados de acordo com as propriedades desejadas. A utiliza??o de grautes na cimenta??o de po?os de petr?leo potencialmente incrementa a precis?o na composi??o da mistura, uma vez que ? necess?ria apenas a adi??o da ?gua de mistura antes de seu bombeio. Tal benef?cio pode ser aproveitado na cimenta??o de po?os desde que as formula??es de grautes atendam ?s caracter?sticas de temperatura e press?o t?picas dos po?os. O objetivo deste trabalho ? avaliar o efeito da adi??o de diferentes percentuais de minerais industriais nas propriedades de grautes leves para po?os de petr?leo onshore. Para a formula??o dos grautes foram empregados minerais industriais leves e res?duos minerais abundantes na regi?o Nordeste, al?m de cimento Portland classe Especial e aditivos qu?micos. Foram formulados grautes com densidades entre 1,55 g/cm3 (13,0 lb/gal) e 1,68 g/cm3 (14,0 lb/gal). Foram realizados ensaios de compacidade, reologia e controle de filtrado. Os resultados mostraram que os grautes que apresentam maior densidade na faixa estudada atendem ?s especifica??es para cimenta??o de po?os rasos onshore. As composi??es mais leves podem, tamb?m, ser ajustadas para a aplica??o do material na cimenta??o de po?os de petr?leo
2

Efeito da adi??o de cargas minerais leves na resist?ncia mec?nica de grautes para cimenta??o de po?os offshore

Cabral, Kleber Cavalcanti 22 July 2011 (has links)
Made available in DSpace on 2014-12-17T14:09:13Z (GMT). No. of bitstreams: 1 KleberCC_TESE.pdf: 2548288 bytes, checksum: f214aa096a5ffb2a48cfa0e23356dfc4 (MD5) Previous issue date: 2011-07-22 / The preparation of cement slurries for offshore well cementing involves mixing all solid components to be added to the mixing water on the platform. The aim of this work was to study the formulation of pre-prepared dry mixtures, or grouts, for offshore oilwell cementing. The addition of mineral fillers in the strength of lightweight grouts applied for depths down to 400 m under water depths of 500 m was investigated. Lightweight materials and fine aggregates were selected. For the choice of starting materials, a study of the pozzolanic activity of low-cost fillers such as porcelain tile residue, microsilica and diatomaceous earth was carried out by X-ray diffraction and mechanical strength tests. Hardened grouts containing porcelain tile residue and microsilica depicted high strength at early ages. Based on such preliminary investigation, a study of the mechanical strength of grouts with density 1.74 g/cm3 (14.5 lb/gal) cured initially at 27 ?C was performed using cement, microsilica, porcelain tile residue and an anti-foaming agent. The results showed that the mixture containing 7% of porcelain tile residue and 7% of microsilica was the one with the highest compressive strength after curing for 24 hours. This composition was chosen to be studied and adapted for offshore conditions based on testes performed at 4 ?C. The grout containing cement, 7% of porcelain tile residue, 7% of active silica and admixtures (CaCl2), anti-foaming and dispersant resulted satisfactory rheology and mechanical strength after curing for 24 hours of curing / A prepara??o de pastas de cimento para po?os offshore envolve a mistura de todos os componentes s?lidos da pasta e a prepara??o da ?gua de mistura feita na pr?pria plataforma. O objetivo desse trabalho ? apresentar um estudo de formula??o de misturas secas pr?preparadas, ou grautes, para a cimenta??o de po?os offshore. Foi avaliado o efeito da adi??o de cargas minerais leves na resist?ncia mec?nica de grautes para cimenta??o prim?ria inicial (at? 400 m) com l?minas d ?gua acima de 500 m. Foi realizada uma sele??o de materiais leves e finos, em substitui??o aos agregados utilizados nos grautes da constru??o civil. Para a escolha dos materiais de partida, primeiramente foi realizado um estudo da atividade pozol?nica de materiais de baixo custo, como res?duo cer?mico de porcelanato, s?lica ativa e diatomita, por meio de difratometria de raios X e resist?ncia mec?nica ? compress?o. Verificou-se que as misturas com adi??o de res?duo de porcelanato e s?lica ativa apresentaram maiores resist?ncias nas primeiras idades. Com isso, foi desenvolvido um estudo da resist?ncia mec?nica ? compress?o de grautes com massa espec?fica 1,74 g/cm3 (14,5 lb/gal), curadas, inicialmente, a 27?C e compostas por cimento, res?duo de porcelanato e s?lica ativa, aditivadas com anti-espumante. Os resultados revelaram que a mistura com 7% de res?duo de porcelanato e 7% de s?lica ativa foi a que apresentou a maior resist?ncia mec?nica ? compress?o em ensaio realizado com 24 horas de cura. Escolhida a composi??o a ser estudada, ela foi adaptada ?s condi??es de po?o offshore, cujos ensaios foram realizados a 4?C. A mistura composta por cimento, 7% de res?duo de porcelanato e 7% de s?lica ativa foi aditivada com acelerador de pega (CaCl2), anti-espumante e dispersante. Os ensaios revelaram que essa composi??o mostrou-se satisfat?ria quanto ? resist?ncia mec?nica ? compress?o com 24 horas de cura, reologia, tempo de pega e volume de ?gua livre

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