FIELD: soil or rock drilling; mining.
SUBSTANCE: group of inventions relates to a drill bit for use in a borehole, a method and a system for drilling a borehole. Drill bit for use in borehole comprises: bit housing, having longitudinal axis, crown, including multiple cutters and static relative to housing, and gauging part associated with transverse expansion of housing bit. Calibrating part includes: a static element, a cavity formed in the bit body adjacent to the static element, and a movable element placed in the cavity and made with possibility of movement relative to the bit body along the longitudinal axis of the element. Movable element can extend from cavity to increase length of calibrating part and be pulled into cavity to reduce length of gaging part.
EFFECT: technical result consists in increase in bit stability, as well as in reduction of load on drive side.
20 cl, 4 dwg
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| EXTENSION-TYPE ELEMENT SYSTEMS FOR DOWN-HOLE TOOLS | 2017 |
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