Special aspects of ice drilling and results of 5G hole drilling at Vostok station, Antarctica

Title Special aspects of ice drilling and results of 5G hole drilling at Vostok station, Antarctica
Publication Type
Journal Article
Year
2014
Author(s) Litvinenko VS , Nikolay I Vasiliev, Volodya Ya Lipenkov, Dmitriev AN, Podoliak AV
Journal/ Publication
Annals of Glaciology
Volume
55
Issue
68
Pagination
173-178
Abstract

This paper documents the drilling of the 5G deep hole at the Russian Vostok station, Antarctica. The hole construction is described and the specifications of the drill and surface drilling equipment are given. The peculiarities of drilling at various depths are considered. Based on the extensive experimental data collected at Vostok station, the processes occurring at the hole bottom are investigated: ice breaking and cutting, bottom cleaning and chip transport, and accumulation of the chips in the screen. The main factors affecting ice-drilling efficiency are the coarseness of ice crystals and the ice temperature. When ice crystal size exceeds 10 mm the cutting efficiency sharply decreases, and when ice temperature exceeds –5°C the chip transport from the hole bottom and the chip density in the screen are reduced. The drill advance then becomes irregular, slows down and may even be terminated in some cases. Optimal values of the basic drilling parameters (e.g. cutter head rotation rate and drilling fluid flow rate in the circulation system) have been deduced empirically. The designs of the cutter head and circulation system including screens have been significantly modified, allowing the drilling process to proceed at a normal rate even in the vicinity of the subglacial lake surface.

DOI
10.3189/2014AoG68A040
URL
Special Collections International Workshop on Ice Drilling Technology Series, 7th International Workshop on Ice Drilling Technology
Categories Deep Drilling
Equipment KEMS / TELGA / TBZS drills
Citation Litvinenko VS , Nikolay I Vasiliev, Volodya Ya Lipenkov, Dmitriev AN, Podoliak AV ( 2014 ) Special aspects of ice drilling and results of 5G hole drilling at Vostok station, Antarctica. Annals of Glaciology , 55 , 68 , 173-178 . doi: 10.3189/2014AoG68A040
Lead Author
Litvinenko VS