ONE-CUTTER DRILLING BIT Russian patent published in 2012 - IPC E21B10/16 E21B10/50 

FIELD: construction.

SUBSTANCE: invention relates to drilling equipment, namely, to one-cutter drilling bits. A one-cutter drilling bit comprises a body with a journal of a leg for placement of a support, with a thread for connection to a drilling string, a system of channels for a washing liquid, a reservoir and a system of lubricant consumption compensation during drilling, a sealed bit movably fixed on the journal, with longitudinal slots on its surface for passage of the washing liquid and wear-resistant hoof-shaped rock-breaking teeth. A zone of equipment for damage of a spherical bottomhole on a bit is represented with teeth installed between washing slots by means of alternation on each crown one after the other - one tooth faces with a flat cutting side the rotation of the bit, and the next one on the crown, the second tooth, faces the same direction with a blunted convex side and further in the same order along the entire length of the crown, at the same time the number of alternating teeth facing with sharp or blunt sides in direction of displacement makes 27-32% of their total quantity on the bit.

EFFECT: invention provides for increased efficiency of bit equipment, higher intensity of rock damage in a central zone of a spherical bottomhole, higher mechanical speed of drilling.

7 dwg