Contribuição da poliacrilamida parcialmente hidrolisada em associação com a bentonita em fluidos de perfuração aquosos
In this study, we investigated the effect of addition of partially hydrolyzed polyacrylamide (HPAM) and bentonite in the physicochemical properties of acquous drilling fluids. Two formulations were evaluated: F1 formulation, which was used as reference, containing carboxymethylcellulose (CMC), ma...
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| Formato: | Dissertação |
| Idioma: | por |
| Publicado em: |
Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/20287 |
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| Resumo: | In this study, we investigated the effect of addition of partially hydrolyzed polyacrylamide
(HPAM) and bentonite in the physicochemical properties of acquous drilling fluids. Two
formulations were evaluated: F1 formulation, which was used as reference, containing
carboxymethylcellulose (CMC), magnesium oxide (MgO), calcite (calcium carbonate
- CaCO3
), xanthan gum, sodium chloride (NaCl) and triazine (bactericidal); and F2,
containig HPAM steady of CMC and bentonite in substituition of calcite. The prepared
fluids were characterized by rheological properties, lubricity and fluid loss. Calcite was
characterized by granulometry and thermal gravimetric analysis (TGA). The formulation
F2 presented filtration control at 93◦C 34 mL while F1 had total filtration. The lubricity
coefficient was 0.1623 for F2 and 0.2542 for F1, causing reduction in torque of 25% for
F1 and 52 % for F2, compared to water. In the temperature of 49 ◦C and shear rate
of 1022 s
−1
, the apparent viscosities were 25, 5 and 48 cP for F1 and F2 formulation,
respectively, showing greater thermal resistance to F2. With the confirmation of higher
thermal stability of F2, factorial design was conducted in order to determine the HPAM
and of bentonite concentrations that resulted in the better performance of the fluids. The
statistical design response surfaces indicated the best concentrations of HPAM (4.3g/L)
and bentonite (28.5 g/L) to achieve improved properties of the fluids (apparent viscosity,
plastic viscosity, yield point and fluid loss) with 95% confidence, as well as the correlations
between these factors (HPAM and bentonite concentrations). The thermal aging tests
indicated that the formulations containing HPAM and bentonite may be used to the
maximum temperature until 150 ◦C. The analyze of the filter cake formed after filtration of
fluids by X-ray diffraction showed specific interactions between the bentonite and HPAM,
explaining the greater thermal stability of F2 compared to the fluid F1, that supports
maximum temperature of 93 ◦C. |
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