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Previous issue date: 2015-07-10 / Pastas de cimento utilizadas em opera??es de cimenta??o de po?os petrol?feros s?o preparadas conforme as caracter?sticas especificas de cada po?o. As propriedades f?sicas requeridas para cada formula??o de pasta dependem das condi??es de temperatura e press?o do po?o a ser cimentado. As propriedades reol?gicas das pastas s?o par?metros de importante controle para a efici?ncia no deslocamento e posicionamento da pasta durante a opera??o de cimenta??o. Um dos principais tipos de aditivo utilizado para a adequa??o das propriedades reol?gicas das pastas de cimento ? o aditivo dispersante. O presente trabalho tem como objetivo estudar, a influ?ncia da varia??o do tempo de adi??o do policarboxilato (0, 5, 10 e 15 minutos) em pastas de cimento, considerando os per?odos iniciais de hidrata??o das part?culas de cimento como ponto fundamental para uma melhor atua??o do aditivo dispersante. Foram preparadas pastas com densidade fixada em 15,6 lb/gal (1,87 g/cm3) e concentra??es de policarboxilato variando entre 0,01 gpc at? 0,05 gpc, a temperatura de circula??o (BHCT) de 51?C e temperatura est?tica (BHST) de 76? C. As pastas foram caracterizadas a partir de ensaios reol?gicos, volume de filtrado, tempo de espessamento e resist?ncia ? compress?o para formula??es. Foram tamb?m realizados ensaios de Difra??o de raios-X (DRX) e Microscopia Eletr?nica de Varredura (MEV). Os resultados mostraram que a adi??o do policaboxilato ap?s 15 minutos reduziu em 70 % os valores dos par?metros reol?gicos. De acordo com resultados de DRX e MEV, a adi??o do dispersante, ap?s 15 minutos, n?o influenciou as rea??es qu?micas e a consequente forma??o dos produtos de hidrata??o do cimento. / Cement pastes used in cementing oil wells operations are prepared according
to the specific characteristics of each well. The physical properties requested for
each folder formulation depend on the temperature and pressure of the well to
be cemented. The rheological properties of the pulp are important control
parameter for efficiency in transportation and positioning the folder during the
cementing operation. One of the main types of additive used for the adjustment
of rheological properties of cement pastes is the dispersant additive. This work
aims to study the influence of variation of the time of addition of the
polycarboxylate (0, 5, 10 and 15 minutes) in cement pastes, considering the
initial periods of hydration of cement particles as fundamental point for better
performance dispersant additive. Pastes were prepared with a density set at
15.6 lb/gal (1.87 g/cm3) and polycarboxylate concentrations ranging from 0.01
gpc to 0.05 gpc circulation temperature (BHCT) of 51?C and static temperature
(BHST) of 76 C. The pastes were characterized from a rheological
measurements, volume filtered, thickening time and resistance to compression
formulations. Also were carried out tests Diffraction X-ray (XRD) and Scanning
Electron Microscopy (MEV). The results showed that the addition of
policaboxilato after 15 minutes decreased by 70% the values of rheological
parameters. According to results of DRX and MEV, the addition of dispersant
after 15 minutes did not affect the chemical reactions and subsequent formation
of cement hydration products. A study of the economic feasibility to realize the
financial benefits of the technique, which can be seen only with the use of the
technique in this work to reduce the cost of production of cement paste was
carried out, can get up to $ 1015.00 for each folder 100 barrels produced with
said formulations.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/21033 |
| Date | 10 July 2015 |
| Creators | Pereira, Dennys Salvino S?rgio |
| Contributors | 00957245408, http://lattes.cnpq.br/2357217530716519, Meireles, Petrucia Duarte da Silva, 05734954403, http://lattes.cnpq.br/3754162575592849, Braga, Renata Martins, 05165674460, http://lattes.cnpq.br/4603529162393328, Santiago, Rodrigo C?sar, 05345915407, http://lattes.cnpq.br/6823966481089536, Freitas, J?lio Cezar de Oliveira |
| Publisher | Universidade Federal do Rio Grande do Norte, PROGRAMA DE P?S-GRADUA??O EM 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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