DOUBLE-EDGED DRILLING BIT Russian patent published in 2006 - IPC E21B10/36 

FIELD: well drilling equipment, particularly percussion drill bits adapted to drill in fractured ground.

SUBSTANCE: drilling bit comprises body with cleaning channels, connection liner and working head with diametrical groove for hard-alloy inserts receiving. The drilling bit is also provided with limiter made as removable member and cross-arm rigidly connected to the body. The cross-arm has axial threaded channel. The drilling bit body also comprises through axial channel for removable member arrangement. The removable member is made as rod with outer thread and with foot bearing and is arranged in axial cross-arm channel. The body is attached to connection liner by threaded connection. The cross-arm is arranged between thrust ends of the body and the liner. Hard-alloy inserts have working edges of different lengths. Edge of one insert has length of not less than drilling bit radius.

EFFECT: increased operational efficiency.

3 cl, 3 dwg