FIELD: mining industry. SUBSTANCE: device has pipe, assembly for rotating pipe relatively to stay element, system for force-pumping fluid into the pipe, stay element placed at the end of pipe and made in form of twisted spring with coils contacting with each other. One end of spring is in immovable connection to the pipe. Portion of spring coils has diameter greater than diameter of the well. EFFECT: increased reliability of device due to simplified construction. 5 cl, 2 dwg
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