A new short borehole logging tool
A new borehole surveying tool was used to log the deep borehole at Camp Century, Greenland in July 1992. This new 6.35cm diameter instrument has a length of only 1m, allowing it to pass through bends in the sometimes highly deformed boreholes. The fluid filled borehole was logged to within 35m of be...
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Snow and Ice Research Group (SIRG), University of Nebraska/Snow and Ice Research Group (SIRG), University of Nebraska
1994
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ftnipr:oai:nipr.repo.nii.ac.jp:00002226 2023-05-15T16:29:28+02:00 A new short borehole logging tool Hansen,B. Lyle Kelty,John R. 1994-03 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2226 http://id.nii.ac.jp/1291/00002226/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2226&item_no=1&attribute_id=18&file_no=1 en eng Snow and Ice Research Group (SIRG), University of Nebraska/Snow and Ice Research Group (SIRG), University of Nebraska https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2226 http://id.nii.ac.jp/1291/00002226/ AA00733561 Memoirs of National Institute of Polar Research. Special issue, 49, 218-223(1994-03) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2226&item_no=1&attribute_id=18&file_no=1 Departmental Bulletin Paper P(論文) 1994 ftnipr 2022-11-12T19:43:03Z A new borehole surveying tool was used to log the deep borehole at Camp Century, Greenland in July 1992. This new 6.35cm diameter instrument has a length of only 1m, allowing it to pass through bends in the sometimes highly deformed boreholes. The fluid filled borehole was logged to within 35m of bedrock, at a slant hole depth of 1350m. The inclination approached or exceeded 30° several times in the lower portion of the borehole. A microprocessor controlled data acquisition package (DAP) measures an internal and external thermistor and two orthogonally mounted inclinometers. The pressure transducer, which also includes a temperature measurement, and the fluxgate compass have independent microprocessor systems which are multiplexed through the DAP. A coaxial cable supplies DC power from the surface to the logger and provides MODEM communications between the DAP and a personal computer on the surface where the data from the DAP and slant hole depth data from the winch are used to compute a directional survey of the borehole. The surface computer provides plots of temperature, fluid pressure, hole inclination and azimuth as a function of true vertical depth as the hole is being surveyed. A set of centering springs can be easily added at the ends of the logging tool for use in boreholes where the inclination is less than 1 degree. Report Greenland Memoirs of National Institute of Polar Research Polar Research National Institute of Polar Research Repository, Japan Greenland |
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Open Polar |
collection |
National Institute of Polar Research Repository, Japan |
op_collection_id |
ftnipr |
language |
English |
description |
A new borehole surveying tool was used to log the deep borehole at Camp Century, Greenland in July 1992. This new 6.35cm diameter instrument has a length of only 1m, allowing it to pass through bends in the sometimes highly deformed boreholes. The fluid filled borehole was logged to within 35m of bedrock, at a slant hole depth of 1350m. The inclination approached or exceeded 30° several times in the lower portion of the borehole. A microprocessor controlled data acquisition package (DAP) measures an internal and external thermistor and two orthogonally mounted inclinometers. The pressure transducer, which also includes a temperature measurement, and the fluxgate compass have independent microprocessor systems which are multiplexed through the DAP. A coaxial cable supplies DC power from the surface to the logger and provides MODEM communications between the DAP and a personal computer on the surface where the data from the DAP and slant hole depth data from the winch are used to compute a directional survey of the borehole. The surface computer provides plots of temperature, fluid pressure, hole inclination and azimuth as a function of true vertical depth as the hole is being surveyed. A set of centering springs can be easily added at the ends of the logging tool for use in boreholes where the inclination is less than 1 degree. |
format |
Report |
author |
Hansen,B. Lyle Kelty,John R. |
spellingShingle |
Hansen,B. Lyle Kelty,John R. A new short borehole logging tool |
author_facet |
Hansen,B. Lyle Kelty,John R. |
author_sort |
Hansen,B. Lyle |
title |
A new short borehole logging tool |
title_short |
A new short borehole logging tool |
title_full |
A new short borehole logging tool |
title_fullStr |
A new short borehole logging tool |
title_full_unstemmed |
A new short borehole logging tool |
title_sort |
new short borehole logging tool |
publisher |
Snow and Ice Research Group (SIRG), University of Nebraska/Snow and Ice Research Group (SIRG), University of Nebraska |
publishDate |
1994 |
url |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2226 http://id.nii.ac.jp/1291/00002226/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2226&item_no=1&attribute_id=18&file_no=1 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Memoirs of National Institute of Polar Research Polar Research |
genre_facet |
Greenland Memoirs of National Institute of Polar Research Polar Research |
op_relation |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2226 http://id.nii.ac.jp/1291/00002226/ AA00733561 Memoirs of National Institute of Polar Research. Special issue, 49, 218-223(1994-03) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2226&item_no=1&attribute_id=18&file_no=1 |
_version_ |
1766019164854550528 |