Drill bit cutter elements and drill bits including same

A cutter element for a drill bit configured to drill a borehole in a subterranean formation, the cutter element comprising:

• a base portion having a central axis, a first end, a second end, and a radially outer cylindrical surface extending axially from the first end to the second end;
• a cutting layer fixably mounted to the first end of the base portion, wherein the cutting layer includes a cutting face distal the base portion and a radially outer cylindrical surface extending axially from the cutting face to the radially outer cylindrical surface of the base portion, wherein the radically outer cylindrical surface of the cutting layer is contiguous with the radially outer cylindrical surface of the base portion;
• wherein the cutting face comprises:
• an elongate raised ridge extending across the cutting face, wherein the raised ridge has a first end at the radially outer surface of the cutting layer and a second end at the radially outer cylindrical surface of the cutting layer, and wherein the raised ridge defines a maximum height of the cutter element measured axially from the second end of the base portion to the cutting face;
• a first planar lateral side surface extending from the raised ridge to the radially outer cylindrical surface of the cutting layer;
• and
• a second planar lateral side surface extending from the raised ridge to the radially outer cylindrical surface of the cutting layer
• wherein the raised ridge of the cutting face comprises a central surface, a cutting surface extending radially from the central surface toward the radially outer cylindrical surface of the cutting layer, and a relief surface extending radially from the central surface toward the radially outer cylindrical surface, wherein the cutting surface is planar and the relief surface is planar;
• wherein the central surface is continuously curved and convex or concave between the cutting surface and the relief surface;
• wherein the central surface has a length L measured from a first intersection of the central surface and the cutting surface to a second intersection of the central surface and the relief surface in top view;
• wherein the central surface has a width W measured from a third intersection of the central surface and the first planar lateral side surface to a fourth intersection of the central surface and the second planar lateral side surface in top view;
• wherein the ratio of the length L to a diameter of the base portion is between 0.10 and 0.90;
• and
• wherein an aspect ratio of the central surface equal to the ratio of the length L to the width W is between 0.10 and 30.0.

A cutter element for a drill bit configured to drill a borehole in a subterranean formation, the cutter element comprising:

• a base portion having a central axis, a first end, a second end, and a radially outer cylindrical surface extending axially from the first end to the second end;
• a cutting layer fixably mounted to the first end of the base portion, wherein the cutting layer includes a cutting face distal the base portion and a radially outer cylindrical surface extending axially from the cutting face to the radially outer cylindrical surface of the base portion, wherein the radically outer cylindrical surface of the cutting layer is contiguous with the radially outer cylindrical surface of the base portion;
• wherein the cutting face comprises:
• a planar central region;
• a planar cutting region extending radially from the planar central region to the radially outer surface of the cutting layer;
• a planar relief region extending radially from the planar central region to the radially outer surface of the cutting layer;
• a first planar lateral side region extending laterally from the planar central region, the planar cutting region, and the planar relief region to the radially outer surface of the cutting layer;
• and
• a second planar lateral side region extending laterally from the planar central region, the planar cutting region, and the planar relief region to the radially outer surface of the cutting layer;
• wherein the first planar lateral side region slopes axially downward moving laterally from the planar central region, the planar cutting region, and the planar relief region toward the radially outer surface of the cutting layer;
• wherein the second planar lateral side region slopes axially downward moving laterally from the planar central region, the planar cutting region, and the planar relief region to the radially outer surface of the cutting layer;
• wherein the planar cutting region is circumferentially positioned between the first planar lateral side region and the second planar lateral side region;
• wherein the planar relief region is circumferentially positioned between the first planar lateral side region and the second planar lateral side region;
• wherein the planar central region is disposed between the first planar lateral side region and the second planar lateral side region;
• wherein the planar central region has a length L measured from a first intersection of the planar central region and the planar cutting region to a second intersection of the planar central region and the planar relief region in top view;
• wherein the planar central region has a width W measured from a third intersection of the planar central region and the first planar lateral side surface to a fourth intersection of the planar central region and the second planar lateral side surface in top view;
• wherein the ratio of the length L to a diameter of the base portion is between 0.10 and 0.90;
• and
• wherein an aspect ratio of the planar central region equal to the ratio of the length L to the width W is between 0.10 and 30.0.