Cutting element apparatuses, drill bits including same, methods of cutting, and methods of rotating a cutting element
A subterranean drilling system may include a drill string and a rotary drill bit coupled to the drill string. The rotary drill bit may include a bit body and a cutting element coupled to the bit body, with the cutting element being structured to rotate in response to torque applied to the cutting element. The system also may include a cam assembly coupled to the drill string, a cam follower assembly in contact with a cam surface of the cam assembly, and a torque-applying structure coupled to the cam follower assembly. The torque-applying structure may be configured to apply torque to the cutting element in response to relative rotation between the cam assembly and the cam follower assembly.
1. A system for drilling a subterranean formation, the system comprising:
a torque-generating assembly;
a drill bit including a bit body and at least one cutting element rotatably coupled to the bit body, the bit body being rotatable relative to the torque-generating assembly;
a structure positioned between the torque-generating assembly and the at least one cutting element, wherein the structure is configured to effect rotation of the at least one cutting element upon rotation of the bit body relative to the torque-generating assembly.
2. The system of claim 1 , wherein the torque-generating comprises a cam follower assembly configured to rotate with the drill bit body relative to a cam assembly.
3. The system of claim 2 , wherein the cam assembly includes a substantially annular body.
4. The system of claim 2 , wherein the substantially annular body includes a cam surface.
5. The system of claim 4 , wherein at least a portion of the cam surface is inclined relative to a plane that is substantially normal to a rotational axis of the bit body.
6. The system of claim 4 , wherein the cam surface is substantially planar.
7. The system of claim 3 , wherein the cam assembly comprises a plurality of inserts coupled with the substantially annular body, the plurality of inserts collectively defining a cam surface.
8. The system of claim 7 , wherein each of the plurality of inserts includes a superabrasive table bonded to a substrate.
9. The system of claim 2 , wherein the structure includes a push rod having a first end positioned adjacent a portion of the cam follower assembly and a second end positioned adjacent a portion of the at least one cutting element.
10. The system of claim 9 , wherein the first end of the push rod is positioned within a recess defined within a cam follower element of the cam follower assembly.
11. The system of claim 9 , wherein the push rod is at least partially disposed within an interior passage of the bit body.
12. The system of claim 11 , further comprising a bushing positioned between the push rod and the interior passage.
13. The system of claim 9 , wherein the push rod is biased towards the at least one cutting element.
14. The system of claim 1 , wherein the torque-generating assembly is coupled with a drill string.
15. The system of claim 1 , wherein the torque-generating assembly comprises a cam assembly that is associated with a sleeve disposed about at least a portion of the bit body.
16. The system of claim 15 , wherein the sleeve is disposed with in a recess formed in a gage portion of the bit body.
17. The system of claim 16 , further comprising at least one radial bearing disposed between the sleeve and the bit body.
18. The system of claim 17 , further comprising at least one thrust bearing disposed between the sleeve and the bit body.
19. The system of claim 1 , further comprising a motor configured to rotate the bit body relative to the torque-generating assembly.
20. The system of claim 1 , wherein the at least one cutting element comprises a superabrasive table bonded to a substrate.