Viscosity and density of a two-phase drilling fluid
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. flo...
| Published in: | Annals of Glaciology |
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| Main Authors: | , |
| Format: | Other/Unknown Material |
| Language: | English |
| Published: |
International Glaciological Society
2007
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| Subjects: | |
| Online Access: | https://oskar-bordeaux.fr/handle/20.500.12278/28330 https://doi.org/10.3189/172756407786857712 |
| Summary: | 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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