Experimental research of ice cuttings transport by air while drilling of the snow-firn layer
The snow-firn layer of the glaciers of Antarctica and Greenland contains data on the composition of the atmosphere in the past, volcanic eruptions, forest fires, anthropogenic pollution, and many other unique information. Nowadays, core drilling methods are widely used for sampling the snow-firn lay...
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| Format: | Article |
| Language: | Russian |
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Nauka
2023-04-01
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| Series: | Лëд и снег |
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| Online Access: | https://ice-snow.igras.ru/jour/article/view/1158 |
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| author | S. A. Ignatiev D. A. Vasilev A. V. Bolshunov M. A. Vasileva A. Yu. Ozhigin |
| author_facet | S. A. Ignatiev D. A. Vasilev A. V. Bolshunov M. A. Vasileva A. Yu. Ozhigin |
| author_sort | S. A. Ignatiev |
| collection | DOAJ |
| description | The snow-firn layer of the glaciers of Antarctica and Greenland contains data on the composition of the atmosphere in the past, volcanic eruptions, forest fires, anthropogenic pollution, and many other unique information. Nowadays, core drilling methods are widely used for sampling the snow-firn layer. Due to numerous complications (loss of air circulation, drill bit sticking, ice balling up, etc.), air ice drilling is not wide spread, yielding in productivity and reliability to thermal and auger drilling methods. However, core barrel drilling with reverse bottom-hole air circulation is a promising technology for drilling the glaciers of Antarctica and Greenland. However, core drilling with reverse bottom-hole air circulation is a promising technology for drilling Antarctic and Greenland glaciers. The authors suggest that this technology, if successfully implemented, will significantly exceed the currently used methods of drilling the upper layers of the glacier. Taking into account the failures of previous projects of core drilling with air, it was decided to conduct research in the conditions of Central Antarctica in order to substantiate the design parameters of the new drill. During 67th Russian Antarctic Expedition (RAE) experimental studies of ice cuttings air transportation while drilling of the snow-firn layer were conducted at Vostok station. In the course of the experimental studies, the VK-22 borehole was drilled to a depth of 30 m with full core and ice cuttings sampling. According to the selected probes, the dependences of the change in the density of the snow-firn layer, bulk density and fractional composition of ice cuttings on the depth of occurrence were established. By using the experimental facility, the suspension velocity (critical speed in drilling) of ice particles of various sizes and shapes was found for the first time. Directions for further research and ways to improve the experimental facility are proposed, which are planned to be implemented in the season of the 68th RAE |
| format | Article |
| id | doaj-art-adc65b8cefa24f8f94dea918e8d7fee4 |
| institution | Matheson Library |
| issn | 2076-6734 2412-3765 |
| language | Russian |
| publishDate | 2023-04-01 |
| publisher | Nauka |
| record_format | Article |
| series | Лëд и снег |
| spelling | doaj-art-adc65b8cefa24f8f94dea918e8d7fee42025-08-04T14:07:48ZrusNaukaЛëд и снег2076-67342412-37652023-04-0163114115210.31857/S2076673423010076790Experimental research of ice cuttings transport by air while drilling of the snow-firn layerS. A. Ignatiev0D. A. Vasilev1A. V. Bolshunov2M. A. Vasileva3A. Yu. Ozhigin4Saint Petersburg Mining UniversitySaint Petersburg Mining UniversitySaint Petersburg Mining UniversitySaint Petersburg Mining UniversitySaint Petersburg Mining UniversityThe snow-firn layer of the glaciers of Antarctica and Greenland contains data on the composition of the atmosphere in the past, volcanic eruptions, forest fires, anthropogenic pollution, and many other unique information. Nowadays, core drilling methods are widely used for sampling the snow-firn layer. Due to numerous complications (loss of air circulation, drill bit sticking, ice balling up, etc.), air ice drilling is not wide spread, yielding in productivity and reliability to thermal and auger drilling methods. However, core barrel drilling with reverse bottom-hole air circulation is a promising technology for drilling the glaciers of Antarctica and Greenland. However, core drilling with reverse bottom-hole air circulation is a promising technology for drilling Antarctic and Greenland glaciers. The authors suggest that this technology, if successfully implemented, will significantly exceed the currently used methods of drilling the upper layers of the glacier. Taking into account the failures of previous projects of core drilling with air, it was decided to conduct research in the conditions of Central Antarctica in order to substantiate the design parameters of the new drill. During 67th Russian Antarctic Expedition (RAE) experimental studies of ice cuttings air transportation while drilling of the snow-firn layer were conducted at Vostok station. In the course of the experimental studies, the VK-22 borehole was drilled to a depth of 30 m with full core and ice cuttings sampling. According to the selected probes, the dependences of the change in the density of the snow-firn layer, bulk density and fractional composition of ice cuttings on the depth of occurrence were established. By using the experimental facility, the suspension velocity (critical speed in drilling) of ice particles of various sizes and shapes was found for the first time. Directions for further research and ways to improve the experimental facility are proposed, which are planned to be implemented in the season of the 68th RAEhttps://ice-snow.igras.ru/jour/article/view/1158central antarcticaair drillingice cuttingscritical speedsuspension velocitycoresnowfirn |
| spellingShingle | S. A. Ignatiev D. A. Vasilev A. V. Bolshunov M. A. Vasileva A. Yu. Ozhigin Experimental research of ice cuttings transport by air while drilling of the snow-firn layer Лëд и снег central antarctica air drilling ice cuttings critical speed suspension velocity core snow firn |
| title | Experimental research of ice cuttings transport by air while drilling of the snow-firn layer |
| title_full | Experimental research of ice cuttings transport by air while drilling of the snow-firn layer |
| title_fullStr | Experimental research of ice cuttings transport by air while drilling of the snow-firn layer |
| title_full_unstemmed | Experimental research of ice cuttings transport by air while drilling of the snow-firn layer |
| title_short | Experimental research of ice cuttings transport by air while drilling of the snow-firn layer |
| title_sort | experimental research of ice cuttings transport by air while drilling of the snow firn layer |
| topic | central antarctica air drilling ice cuttings critical speed suspension velocity core snow firn |
| url | https://ice-snow.igras.ru/jour/article/view/1158 |
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