Drill bits and methods for forming curved portions of a borehole

A drill bit adapted for forming a curved portion of a borehole, the drill bit comprising:

• a body having a first end and a second end;
• a shank disposed at the first end of the body, wherein the shank is adapted for attachment to a drill string, a downhole component, or combinations thereof;
• a bit face disposed at the second end of the body, wherein the bit face comprises a perimeter region and an interior region, and wherein the interior region comprises a recessed conical portion for contacting a formation to provide stability to the drill bit;
• a plurality of tungsten carbide inserts disposed in the perimeter region, wherein the plurality of tungsten carbide inserts define a leading edge oriented to bore into the formation in a direction generally perpendicular to the bit face;
• and
• a plurality of polycrystalline diamond compact cutting elements disposed in the interior region, wherein the plurality of polycrystalline diamond compact cutting elements are oriented to bore into the formation in a direction generally parallel to the bit face, wherein the plurality of tungsten carbide inserts are adapted to engage the formation to form a curved region of a borehole, and wherein the plurality of polycrystalline diamond compact cutting elements are adapted to engage the formation to form a linear region of the borehole.