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Previous issue date: 2016-01-14 === Nas opera??es de perfura??o de po?os, s?o frequentes os problemas provocados pela contamina??o do fluido de perfura??o. A dissolu??o de ?ons provenientes das forma??es geol?gicas prejudica as propriedades reol?gicas e de filtra??o dos fluidos. Esses ?ons blindam as cargas dos pol?meros i?nicos, podendo levar a sua precipita??o. Neste trabalho foi realizado um estudo criterioso sobre a estabilidade das propriedades de solu??es aquosas e de fluidos de perfura??o aquosos na presen?a de pol?meros carboxilados e sulfatados, empregando a carboximetilcelulose e a kappa-carragenana como compostos modelo de pol?mero carboxilado e sulfatado, respectivamente. Os efeitos da for?a i?nica do meio aquoso contendo ?ons Na+, Mg2+ e Ca2+ sobre as propriedades reol?gicas das solu??es polim?ricas e dos fluidos de perfura??o foram avaliados variando a concentra??o dos sais, pH e temperatura. Foi observado que os fluidos com ?-carragenana sofreram menor influ?ncia frente ? contamina??o pelos ?ons em pH 9 a 10, mesmo em maiores concentra??es, por?m maior influ?ncia em pH >11. Os fluidos contendo carboximetilcelulose se mostraram mais sens?veis ? contamina??o, com redu??o brusca da viscosidade e aumento significativo do volume de filtrado, enquanto que os fluidos ? base do pol?mero sulfatado kappa-carragenana apresentaram evid?ncias de intera??o com c?tions com preserva??o das propriedades reol?gicas e maior estabilidade no volume de filtrado. === 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 ?-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.
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