| 摘要 |
A cutter profile for a fixed cutter drill bit having a drill bit axis, the cutter profile including a nose portion radially offset from the drill bit axis and surrounding the drill bit axis, a first cone-shaped depression centered on the drill bit axis and extending radially to the nose portion, and a second cone-shaped depression centered on the drill bit axis and extending radially toward the nose portion, wherein a second depression diameter is smaller than a first depression diameter, wherein a second depression maximum depth is greater than a first depression maximum depth, and wherein a second depression included angle is smaller than a first depression included angle. |
