997 resultados para CAMARA DE LECHO FLUIDO
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Manuscript note at end.
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First published Lisbon, 1807.
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Carece de portada.
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Mode of access: Internet.
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Este estudo tem a intenção de apresentar o cristianismo profético que caracterizou parte do catolicismo brasileiro nas décadas de 1950 a 1970 e que nas décadas seguintes sofreu a ofensiva dos poderes governamentais, ditatoriais e eclesiásticos que ocasionaram seu eclipse no cenário religioso e social do país. Uma pesquisa bibliográfica sobre a situação histórica e social e sobre os referenciais teóricos da sociologia da esperança de Henri Desroche e dos tipos ideais (profeta, sacerdote e mago) de Max Weber, cujo antagonismo foi aprofundado por Pierre Bourdieu, orientou a análise deste processo de ocultamento. A hipótese central é a de que o Eclipse do Cristianismo Profético segue a dinâmica dos movimentos marginais e utópicos que pululam na história da humanidade e que foram elencados e analisados pela sociologia da religião de Henri Desroche, especialmente na parte dedicada aos homens da espera. O estudo de caso sobre o itinerário eclesial e humanitário de dom Helder Camara iluminará, de modo existencial, o percurso do eclipse deste cristianismo social.
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Compatibility testing between a drilling fluid and a cement slurry is one of the steps before an operation of cementing oil wells. This test allows us to evaluate the main effects that contamination of these two fluids may cause the technological properties of a cement paste. The interactions between cement paste and drilling fluid, because its different chemical compositions, may affect the cement hydration reactions, damaging the cementing operation. Thus, we carried out the study of the compatibility of non-aqueous drilling fluid and a cement slurry additives. The preparation procedures of the non-aqueous drilling fluid, the cement paste and completion of compatibility testing were performed as set out by the oil industry standards. In the compatibility test is evaluated rheological properties, thickening time, stability and compressive strength of cement pastes. We also conducted analyzes of scanning electron microscopy and X-ray diffraction of the mixture obtained by the compatibility test to determine the microstructural changes in cement pastes. The compatibility test showed no visual changes in the properties of the cement paste, as phase separation. However, after the addition of nonaqueous drilling fluid to cement slurry there was an increased amount of plastic viscosity, the yield point and gel strength. Among the major causative factors can include: chemical reaction of the components present in the non-aqueous drilling fluid as the primary emulsifier, wetting agent and paraffin oil, with the chemical constituents of the cement. There was a reduction in the compressive strength of the cement paste after mixing with this drilling fluid. Thickening test showed that the oil wetting agent and high salinity of the non-aqueous fluid have accelerating action of the handle of the cement paste time. The stability of the cement paste is impaired to the extent that there is increased contamination of the cement slurry with the nonaqueous fluid. The X-ray diffraction identified the formation of portlandite and calcium silicate in contaminated samples. The scanning electron microscopy confirmed the development of the identified structures in the X-ray diffraction and also found the presence of wells in the cured cement paste. The latter, formed by the emulsion stability of the drilling fluid in the cement paste, corroborate the reduction of mechanical strength. The oil wetting agent component of the non-aqueous drilling fluid, the modified cement hydration processes, mainly affecting the setting time.