Rotational drill bits and drilling apparatuses including the same

摘要

A roof-bolt drill bit. The roof-bolt drill bit may include a bit body rotatable about a central axis and a cutting element coupled to the bit body. The bit body may comprise a forward end, a rearward end axially spaced away from the forward end, and an internal passage defined within the bit body, with the internal passage extending from a rearward opening defined in the rearward end of the bit body through at least a portion of the bit body. A fluid port is configured to direct fluid from the internal passage through a port opening in a direction that forms an angle with respect to a forward direction of the central axis.

主权项

1. A roof-bolt drill bit comprising:
a bit body rotatable about a central axis, the bit body comprising:
a forward end;a rearward end axially spaced away from the forward end;at least two cutting element support structures, each of the at least two cutting element support structures comprising a mounting surface and a trailing support surface;an internal passage defined within the bit body, the internal passage extending from a rearward opening defined in the rearward end of the bit body through at least a portion of the bit body; at least two cutting elements coupled to the bit body, each of the at least two cutting elements comprising:
a cutting face;a cutting edge adjacent to the cutting face;a trailing surface spaced away from the cutting face, the trailing surface being fixed to the mounting surface of the corresponding cutting element support structure; wherein:
a fluid port is defined within each of the at least two cutting element support structures between the mounting surface and the trailing support surface of the corresponding element support structure, each of the fluid ports extending from the internal passage to a port opening defined in the corresponding cutting element support structure;each of the port openings is positioned adjacent to the trailing surface of the corresponding cutting element.