УСТРОЙСТВО ДЛЯ РАСШИРЕНИЯ ОПЕРЕЖАЮЩЕЙ СКВАЖИНЫ

摘要

FIELD: mining industry and building, particularly to drill horizontal wells for trenchless pipeline laying. ^ SUBSTANCE: advance bore reaming device used during bore forming under obstacles comprises drilling string connected to casing column through reaming mechanism. The reaming mechanism is provided with two crowns having cutter holders, which rotate in opposite directions through integral planetary reduction gear. The planetary reduction gears multiply output rotational moments applied to both crowns rotating in opposite directions and release drilling string from reactive moment. ^ EFFECT: increased operational reliability and capability due to increased power applied to rock-cutting tools of the device and due to elimination of reactive moment taken by drilling string. ^ 2 dwg