Drill bits and earth-boring tools including shaped cutting elements

A fixed-cutter earth-boring rotary drill bit, comprising:

• a bit body comprising fixed blades;
• and
• cutting elements secured to the fixed blades of the bit body, at least some of the cutting elements comprising:
• a substantially cylindrical substrate base;
• and
• a cutting tip secured to the substrate base, the cutting tip comprising:
• an elongated surface defining a longitudinal end of the cutting tip;
• a first generally conical surface extending from proximate the substrate base toward the longitudinal end of the cutting tip;
• an opposing second generally conical surface extending from proximate the substrate base toward the longitudinal end of the cutting tip;
• a first flank surface extending between the first generally conical surface and the opposing second generally conical surface and extending from proximate the substrate base toward the longitudinal end of the cutting tip;
• and
• an opposing second flank surface extending between the first generally conical surface and the opposing second generally conical surface and extending from proximate the substrate base toward the longitudinal end of the cutting tip;
• wherein the elongated surface defining the longitudinal end of the cutting tip is relatively more narrow in a central region thereof than in a radially outer region thereof;
• and
• wherein at least some of the cutting elements are back raked to provide initial engagement with one of the first generally conical surface and the opposing second generally conical surface with a formation to be bored by the bit body and each of the first flank surface and the opposing second flank surface of the cutting tip is configured to stabilize the respective cutting element within at least one groove cut in the formation.

A fixed-cutter earth-boring tool, comprising:

• a fixed-cutter tool body;
• and
• cutting elements attached to the fixed-cutter tool body, at least some of the cutting elements comprising:
• a substantially cylindrical substrate base;
• and
• a cutting tip comprising:
• a first generally conical surface extending from proximate the substrate base to a longitudinal end of the cutting tip;
• a second generally conical surface extending from proximate the substrate base to the longitudinal end of the cutting tip, the second generally conical surface opposite the first generally conical surface relative to a longitudinal axis of the cutting tip;
• a first flank surface extending from proximate the substrate base to the longitudinal end of the cutting tip and extending between the first generally conical surface and the second generally conical surface;
• and
• a second flank surface extending from proximate the substrate base to the longitudinal end of the cutting tip and extending between the first generally conical surface and the second generally conical surface, the second flank surface opposite the first flank surface relative to the longitudinal axis of the cutting tip;
• wherein an elongated surface defining the longitudinal end of the cutting tip is relatively more narrow in a central region thereof than in a radially outer region thereof;
• and
• wherein at least one cutting element is oriented relative to the fixed-cutter tool body such that the cutting tip of the at least one cutting element is back raked and configured to initially engage a formation to be bored by the fixed-cutter earth-boring tool with one of the first generally conical surface and the second generally conical surface of the at least one cutting element and each of the first flank surface and the second flank surface of the cutting tip is configured to stabilize the respective cutting element within at least one groove cut in the formation.