Patent ID: 9725959
Date: 2017-08-08
CPC Classifications: E21B

Claim:
1. A cutter profile for a fixed cutter drill bit, wherein the drill bit has a drill bit axis, the cutter profile comprising: (a) a nose portion radially offset from the drill bit axis and surrounding the drill bit axis; (b) a first cone-shaped depression defined by the drill bit and centered on the drill bit axis, wherein the first cone-shaped depression extends radially from the drill bit axis to the nose portion, wherein the first cone-shaped depression has sides, wherein the first cone-shaped depression has a first depression diameter, wherein the first cone-shaped depression has a first depression maximum depth, and wherein the first cone-shaped depression has a first depression included angle; and (c) a second cone-shaped depression defined by the drill bit and centered on the drill bit axis, wherein the second cone-shaped depression extends radially from the drill bit axis toward the nose portion, wherein the second cone-shaped depression has sides, wherein the second cone-shaped depression has a second depression diameter, wherein the second cone-shaped depression has a second depression maximum depth, wherein the second cone-shaped depression has a second depression included angle, wherein the second depression diameter is smaller than the first depression diameter, wherein the second depression maximum depth is greater than the first depression maximum depth, and wherein the second depression included angle is smaller than the first depression included angle, so that the sides of the first cone-shaped depression extend from the nose portion to the second depression diameter, so that the sides of the second cone-shaped depression extend from the bit axis to the second depression diameter, and so that the sides of the first cone-shaped depression and the sides of the second cone-shaped depression meet at the second depression diameter.