Electromechanical drilling of a 300-m core in a dry hole at Summit, Greenland
During the EUROCORE project in 1989 at Summit, Central Greenland, a 304.8-m long ice core of 105mm diameter was retrieved with an electromechanical drill. A dry drilling technique was used in order to minimise contamination of the ice. A special drill head with a small chipping depth was designed to...
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University of Bern, Physics Institute/University of Bern, Physics Institute
1994
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ftnipr:oai:nipr.repo.nii.ac.jp:00002213 2023-05-15T16:27:14+02:00 Electromechanical drilling of a 300-m core in a dry hole at Summit, Greenland Schwander,Jakob Rufli,Heinrich 1994-03 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2213 http://id.nii.ac.jp/1291/00002213/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2213&item_no=1&attribute_id=18&file_no=1 en eng University of Bern, Physics Institute/University of Bern, Physics Institute https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2213 http://id.nii.ac.jp/1291/00002213/ AA00733561 Memoirs of National Institute of Polar Research. Special issue, 49, 93-98(1994-03) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2213&item_no=1&attribute_id=18&file_no=1 Departmental Bulletin Paper P(論文) 1994 ftnipr 2022-11-12T19:43:03Z During the EUROCORE project in 1989 at Summit, Central Greenland, a 304.8-m long ice core of 105mm diameter was retrieved with an electromechanical drill. A dry drilling technique was used in order to minimise contamination of the ice. A special drill head with a small chipping depth was designed to assure minimal fracturing of the core. The quality was excellent to the depth of 180m, but then deteriorated due to increasing brittleness of the ice. Down to 280m we were able to maintain the mean length of unbroken core pieces above 0.1m by reducing the pitch from 7 to 2mm. The sticking of the consequently finer chips to the drill barrels was reduced by treating the barrels repeatedly with a silicone-based wax solution. Hole enlargement cutters near the upper end of the drill head prevented the drill from becoming stuck due to borehole closure. Report Greenland ice core Memoirs of National Institute of Polar Research Polar Research National Institute of Polar Research Repository, Japan Greenland |
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Open Polar |
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National Institute of Polar Research Repository, Japan |
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ftnipr |
language |
English |
description |
During the EUROCORE project in 1989 at Summit, Central Greenland, a 304.8-m long ice core of 105mm diameter was retrieved with an electromechanical drill. A dry drilling technique was used in order to minimise contamination of the ice. A special drill head with a small chipping depth was designed to assure minimal fracturing of the core. The quality was excellent to the depth of 180m, but then deteriorated due to increasing brittleness of the ice. Down to 280m we were able to maintain the mean length of unbroken core pieces above 0.1m by reducing the pitch from 7 to 2mm. The sticking of the consequently finer chips to the drill barrels was reduced by treating the barrels repeatedly with a silicone-based wax solution. Hole enlargement cutters near the upper end of the drill head prevented the drill from becoming stuck due to borehole closure. |
format |
Report |
author |
Schwander,Jakob Rufli,Heinrich |
spellingShingle |
Schwander,Jakob Rufli,Heinrich Electromechanical drilling of a 300-m core in a dry hole at Summit, Greenland |
author_facet |
Schwander,Jakob Rufli,Heinrich |
author_sort |
Schwander,Jakob |
title |
Electromechanical drilling of a 300-m core in a dry hole at Summit, Greenland |
title_short |
Electromechanical drilling of a 300-m core in a dry hole at Summit, Greenland |
title_full |
Electromechanical drilling of a 300-m core in a dry hole at Summit, Greenland |
title_fullStr |
Electromechanical drilling of a 300-m core in a dry hole at Summit, Greenland |
title_full_unstemmed |
Electromechanical drilling of a 300-m core in a dry hole at Summit, Greenland |
title_sort |
electromechanical drilling of a 300-m core in a dry hole at summit, greenland |
publisher |
University of Bern, Physics Institute/University of Bern, Physics Institute |
publishDate |
1994 |
url |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2213 http://id.nii.ac.jp/1291/00002213/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2213&item_no=1&attribute_id=18&file_no=1 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland ice core Memoirs of National Institute of Polar Research Polar Research |
genre_facet |
Greenland ice core Memoirs of National Institute of Polar Research Polar Research |
op_relation |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2213 http://id.nii.ac.jp/1291/00002213/ AA00733561 Memoirs of National Institute of Polar Research. Special issue, 49, 93-98(1994-03) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2213&item_no=1&attribute_id=18&file_no=1 |
_version_ |
1766016356915871744 |