DRILL BIT Russian patent published in 2022 - IPC E21B10/00 E21B10/46 

FIELD: drilling bits.

SUBSTANCE: invention relates to drilling bits. The drill bit includes a body with blades made on it, in which PDC cutters with a flat front face are placed. PDC cutters with a flat front edge are fixed on the blades from the center to the periphery in the diametral plane along two symmetrical logarithmic spirals with negative front angles varying from minus 30 degrees in the center to minus 10 degrees at the periphery with an interval of one degree in the form of a two-start "thread". In order to dampen vibration from torsional and longitudinal vibrations of the bit, which cause breakage of PDC cutters with a flat front face, as well as to increase the efficiency and service life of its work, a second row of PDC cutters with a convex conical shape is installed stepwise behind the PDC cutters with a flat front face. The second row of PDC cutters with a convex conical shape is located in the cutting lines, between the PDC cutters with a flat front edge. In the center, a PDC cutter with a convex cone shape is installed, ahead of the PDC cutters with a convex cone shape in height from 1 mm to 5 mm relative to the PDC cutters with a flat cutting edge, behind which the corresponding PDC cutters with a convex cone shape are installed.

EFFECT: creation of a drill bit that equally well destroys rocks from 5 to 9 categories in terms of drillability, as well as in increasing the mechanical speed of drilling rocks.

1 cl, 2 dwg, 1 tbl