... Accordingly, improvements in the rheolgical and sag stability properties of drilling fluids employed in these technically demanding environments are mandated. Because of the very limited operational window, the ECD contribution from the rheological properties of the drilling fluid must...

... salts. Formates as the internal salt, gave generally better performance than if calcium chloride was used. The best performance with respect to sag stability in the tests was observed using an ammonium calcium nitrate as the internal salt phase. The paper describes in detail the effect that different...