masterThesis
Efeito da força iônica nas propriedades de fluidos de perfuração aquosos à base de polímeros carboxilados e sulfatados
Fecha
2016-01-14Registro en:
MADRUGA, Liszt Yeltsin Coutinho. Efeito da força iônica nas propriedades de fluidos de perfuração aquosos à base de polímeros carboxilados e sulfatados. 2016. 76f. Dissertação (Mestrado em Química) - Centro de Ciências Exatas e da Terra, Universidade Federal do Rio Grande do Norte, Natal, 2016.
Autor
Madruga, Liszt Yeltsin Coutinho
Resumen
In the well drilling operations problems caused by contamination of the drilling fluid
are common. The dissolution of ions from the geological formations affects the rheological
and filtration properties of the fluids. These ions shield the charges of ionic polymers, leading
to its precipitation. In this work was performed a detailed study on the stability of the
properties of aqueous solutions and aqueous drilling fluids in the presence of sulphated and
carboxylated polymers, using carboxymethylcellulose and kappa-carrageenan as polymer
compounds carboxylated and sulfated model, respectively. The effects of ionic strength of the
aqueous medium containing Na+, Mg2+ and Ca2+ on rheological properties of the polymer and
drilling fluids solutions were evaluated by varying the concentration of salts, pH and
temperature. It was observed that the fluids with κ-carrageenan suffered less influence against
the contamination by the ions at pH 9 to 10, even at higher concentrations, but higher
influence on pH> 11. The fluids containing carboxymethylcellulose were more sensitive to
contamination, with rapid reduction in viscosity and significant increase of the filtrate
volume, while the fluid based polymer sulfated kappa-carrageenan showed evidence of
interaction with cations and preserve the rheological properties and improved stability the
volume of filtrate.