| 摘要 |
A drill bit cutter element comprises 100 a base portion 101 and a cutting portion 102, the cutting portion comprising a sloping polygonal planar surface 112 and a side surface 114 extending from the base to the planar surface and including three or more facets 117 - 119. The planar surface can extend from a peak (122) to the base and the facets of the side surface can extend between the base and the planar surface. The cutter element 100 is mounted in a rolling cone cutter (14) of a drill bit (10) and, in certain embodiments, is positioned such that, when the cutter element (100) is in a position farthest from the bit axis, the planar surface 112 generally faces and is parallel to the borehole sidewall and the peak (122) engages the borehole bottom. |
