PDC drill bit with flute design for better bit cleaning

摘要

A drill bit is disclosed, comprising: a drill bit head having a cutting face with one or more fixed cutting elements; a flow passage extending from the center towards the gage of the bit which has been designed to increase the velocity across the cutting elements.

主权项

1. A drill bit, comprising:
a drill bit head having a plurality of cutting blades where each cutting blade has a front face having a first depth and a back face having a second depth less than the first depth, each pair of adjacent cutting blades defining a flute between the front face of one of the pair of adjacent cutting blades and the back face of another of the pair of adjacent cutting blades, each of the cutting blades and flutes extending radially outward from a center of the drill bit head, the flute having a circumferential width between the front face and the back face defining the flute that increases radially outwardly; each flute having a base extending between the front face and the back face defining the flute; each flute having a cross-section parallel to the front face, the cross-section having an area that increases in a direction from the back face to the front face defining the flute such that each flute has a first cross-sectional area proximal the front surface and a second cross-sectional area proximal the back surface where the second cross-sectional area is at least 15% smaller than the first cross-sectional area.