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Viscosity and density of a two-phase drilling fluid

Abstract : Many ice-core drilling projects expect to reach depths greater than 1000 m. At such depths it is necessary to fill the borehole with a fluid to compensate the ice pressure and avoid the resulting significant hole closure. Knowledge of the ice-chips and drilling-fluid circulation parameters (e.g. flow rate, pressure drop, velocity) is essential for understanding the behaviour of the fluid around the drill and will support drill design through a better parameterization in models. A characterization of the dynamic viscosity and of the density of the ice-chips and drilling-fluid mixture is required to calculate these circulation parameters. The goal of this study is to propose a method to calculate, to a first approximation, both these physical properties. The relationships presented here have been established after experimentation, building on prior assumptions taken from the literature.
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O. Alemany, H. Mityar. Viscosity and density of a two-phase drilling fluid. Annals of Glaciology, Cambridge University Press 2007, 47 (1), pp.141 à 146. ⟨10.3189/172756407786857712⟩. ⟨insu-00375866⟩



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