Influência do tempo de adição do policarboxilato em pastas de cimento Portland para cimentação de poços petrolíferos
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 imp...
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| פורמט: | Dissertação |
| שפה: | por |
| יצא לאור: |
Universidade Federal do Rio Grande do Norte
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| גישה מקוונת: | https://repositorio.ufrn.br/jspui/handle/123456789/21033 |
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| סיכום: | 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. |
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