D.V. Lucena, P.R. Borges, L.V. Amorim, H.L. Lira
At present, concern with the environment damage and the costs involved in the disposing of contaminated cuttings have led to find drilling fluids water based, but during the well drilling it is common the presence of formations with shales and hydratable clays, in these cases, it is necessary the use of swelling inhibitors, that are chemical compounds with capacity of to reduce, in a effective way, the hydration of clays. The aim of this work is to develop formulations of water base drilling fluids with high power of inhibition, ecological correct and with low toxicity, to be applied in deep drilling well with shale and hydratable clays formations. The results reached until now are promising and the prepared fluids can maintain the values of filtrate volume almost constant before and after the contamination and this suggest that the studied inhibitors are efficient after clay contamination.