| 摘要 |
Cutting a rock formation with a polycrystalline diamond rotating bit (10) is optimized by cutting by means of a kerfing action. The polycrystalline diamond cutters (18) are arranged and configured on the bit face to form a plurality of triads. Each triad includes two kerf cutting teeth (18a) and a clearing tooth (18b). The kerf cutting teeth (18a) each cut a kerf into the rock formation. The two radially spaced kerf cutting teeth (18a) thus define an interlying annular space of rock. A clearing tooth (18b) removes the interlying space. In a preferred embodiment, the radial width of the land is equal to or less than the effective cutting width of the clearing tooth (18b), and each of the kerf cutting teeth (18a) and the clearing tooth (18b) are azimuthally offset one from the other on the bit face with the clearing tooth (18b) azimuthally disposed between the kerf cutting teeth (18b). |
