Drilling of Deep Borehole 5G at the Antarctic Station 'Vostok' in Ice Layers with the Ice Temperature Close to the Phase Transition Point

摘要

The paper provides information about the features of drilling of deep borehole 5G, drilled in ice massif, at the Russian Antarctic Vostok station. Presents the main causes of problems in drilling deep wells at a temperature of the ice close to the phase transition point. The design of the electromechanical drill and discusses the changes made to its design. A new design of the drill head and filter slamboree compartment. The new design of the drill bit enables drilling coarse ice, and the use of a new filter - the possibility of drilling of ice at a temperature close to the phase transition point by regulating the flow of priming liquid from the sludge.