Drill bits having blind-hole flushing and systems for using same

摘要

A drill bit for forming a hole in a formation. The drill bit has a shank and a full face crown that cooperate to define an interior space that receives water or other drilling fluid. The full face crown defines a plurality of bores that extend from a cutting face of the full face crown to the interior space. The full face crown completely circumferentially encloses the interior space of the drill bit.

主权项

1. A full-face impregnated drill bit for forming a hole in a formation, the drill bit having a longitudinal axis and comprising:
a shank; a full face crown having a cutting face and an outer surface, the full face crown and the shank cooperating to define an interior space about the longitudinal axis, wherein the cutting face is configured to contact the formation to form the hole, wherein the full face crown defines a plurality of bores extending from the cutting face to the interior space, wherein each bore comprises an outlet portion that is circumferentially surrounded by the cutting face such that the plurality of bores reduce an area of contact between the cutting face and the formation, wherein the plurality of bores are configured to direct drilling fluid directly to the cutting face from the interior space, and wherein the full face crown comprises diamonds impregnated within a matrix, wherein the full face crown completely circumferentially encloses the interior space, and wherein the full face crown does not comprise a waterway extending radially between the outer surface of the full face crown and the interior space.