http://lattes.cnpq.br/4587143787885544; LIMA, Mário César de Siqueira.
Resumo:
During well drilling, mineral particles from geological formations are pertinently added
to the drilling fluids, which can change their properties, affecting their performance.
Thus, the present work aimed to evaluate the influence of the addition of minerals of
different chemical natures (bentonite clay, silica, carbonate and halite) on the
properties of olefinic fluids used in offshore oil well drilling. For this purpose, olefinic
drilling fluids were prepared and mineral particles of bentonite clay, silica, carbonate
and halite were added to them in a volumetric proportion of 5%. The fluids were
characterized by density tests, rheological behavior, gravitational separation (bottle
test), HPHT filtrate volume, electrical stability and optical microscopy, before and after
the dynamic thermal aging process. The results showed that among the evaluated
minerals, the addition of halite provided a negative influence on the fluid properties,
compromising its performance. On the other hand, the addition of other minerals (clay,
silica and carbonate) improved the rheological properties and fluid stability. In
particular, the addition of bentonite clay promoted a more expressive positive effect on
the fluid behavior.