DRILLING BIT WITH BIT LOAD SELF-REGULATION Russian patent published in 2019 - IPC E21B10/60 E21B10/38 

FIELD: drilling soil or rock.

SUBSTANCE: invention relates to a drill bit with a self-adjusting bit load for pulsed jetting drilling. Bit includes a drill reamer, a bit load control element, a transmission mechanism guiding the bit and a pulse action generating mechanism. Pulse action generating mechanism contains centering, driving, rotating and throttling elements arranged in series. Centering, driving and rotating elements are connected in series, and the throttling element is connected to the rotating element by means of guaranteed clearance fit. Both the centering element and the throttling element, respectively, are provided with a through channel for the flow of drilling mud. Drive element rotates the rotating element, the rotating element is rotated relative to the through channel in the throttling element.

EFFECT: invention can implement percussion rotary drilling using a guide bit, reduce the effect of pressing rock fragments caused by a guide bit and a drill reamer, and implement an automatic and acceptable distribution of the load on the bit in order to protect the bit, increase the service life and speed of the bit and improve the efficiency of drilling.

8 cl, 9 dwg