The SUBGLACIOR drilling probe: hydraulic considerations

Title The SUBGLACIOR drilling probe: hydraulic considerations
Publication Type
Journal Article
Year
2020
Author(s) Olivier Alemany , Pavel Talalay, Boissonneau P, Jérôme Chappellaz, Chemin JF, Romain Duphil, Eric Lefebvre, Luc Piard, Philippe Possenti, Jack Triest
Journal/ Publication
Annals of Glaciology
Pagination
1-12
Abstract

Using significant technological breakthroughs and unconventional approaches, the goal of the in situ probing of glacier ice for a better understanding of the orbital response of climate (SUBGLACIOR) project is to advance ice core research by inventing, constructing and testing an in situ probe to evaluate if a target site is suitable for recovering ice as old as 1.5 million years. Embedding a laser spectrometer, the probe is intended to make its own way down into the ice and to measure, in real time and down to the bedrock, the depth profiles of the ice δD water isotopes as well as the trapped CH4 gas concentration and dust concentration. The probe descent is achieved through electromechanical drilling combined with continuous meltwater sample production using a central melting finger in the drill head. A key aspect of the project lies in the design and implementation of an efficient method to continuously transfer to the surface the ice chips being produced by the drill head and from the refreezed water expulsed downstream from the melting finger, into the borehole. This paper presents a detailed calculation and analysis of the flow rates and pressure conditions required to overcome friction losses of the drilling fluid and to effectively transport ice chips to the surface.

DOI
10.1017/aog.2020.79
File
URL
Special Collections International Workshop on Ice Drilling Technology Series, 8th International Ice Drill Symposium
Categories Deep Drilling, Drill Heads, Fast Access, Hot-Point Drills, Subglacial Access
Equipment SUBGLACIOR probe
Citation Olivier Alemany , Pavel Talalay, Boissonneau P, Jérôme Chappellaz, Chemin JF, Romain Duphil, Eric Lefebvre, Luc Piard, Philippe Possenti, Jack Triest ( 2020 ) The SUBGLACIOR drilling probe: hydraulic considerations. Annals of Glaciology , 1-12 . doi: 10.1017/aog.2020.79
Lead Author
Olivier Alemany