Systems and methods for mounting a cutter in a drill bit
Rotary drill bits may include on or more cutting element assemblies which include a cutter and a mounting system. In one embodiment, the mounting system includes a housing, a first bearing component disposed within the housing, and a second bearing component associated with the cutting element. In certain embodiments, the bearing components may comprise a table of superhard material bonded with a substrate. In one or more embodiments, the bearing components may include bearing surfaces that are arcuate. For example, the bearing surfaces may be substantially spherical (a portion of a sphere). The bearing components may be arranged to act as a radial bearing as well as a thrust bearing for the cutting element, enabling the cutting element to rotate about a longitudinal axis of the cutter, relative to the housing, while also enabling the longitudinal axis of the cutter to be displaced (change angles) relative to the housing.
1. A method of drilling a subterranean formation, the method comprising:
providing a drill bit having a body, a first cutting insert coupled with the body via a first mounting system wherein the first mounting system to includes a housing having a pocket formed therein and housing at least a portion of the first cutting insert;
providing at least one radial bearing component between the first cutting insert and the housing;
providing at least one thrust bearing component between the first cutting insert and the housing;
providing a seal between the housing and the first cutting insert;
engaging a subterranean formation with the drill bit while rotating the drill bit about a first rotational axis;
rotating the first cutting insert about a second rotational axis relative to the housing while rotating the drill bit about the first rotational axis;
maintaining a substantially annular clearance gap located between the housing and the first cutting insert and extending from the seal towards the at least one thrust bearing component while rotating the first cutting insert about the second rotational axis.
2. The method according to claim 1 , further comprising enabling the second rotational axis to vary angularly relative to the housing.
3. The method according to claim 2 , further comprising coupling at least a second cutting insert with the body via a second mounting system.
4. The method according to claim 3 , further comprising configuring the second mounting system to include at least one radial bearing component between the at least a second cutting insert and the housing of the at least one mounting system and at least one thrust bearing component between the at least a second cutting insert and the housing of the at least a second mounting system.
5. The method according to claim 2 , further comprising retaining the first cutting insert within the pocket with a retaining member.
6. The method according to claim 1 , further comprising pressurizing the pocket.
7. The method according to claim 1 , further comprising providing a plurality of grooves formed in a peripheral region of the cutting insert.
8. The method according to claim 7 , wherein the plurality of grooves are each at least partially formed in a side surface of the cutting insert.
9. The method according to claim 1 , further comprising providing the housing with a first housing component and a second housing component, and threadably coupling the first housing component with the second housing component.
10. The method according to claim 9 , further comprising brazing the first housing component to the bit body.
11. The method according to claim 1 , further comprising brazing the housing to the bit body.
12. The method according to claim 1 , further comprising lubricating the at least one radial bearing component.
13. The method according to claim 1 , further comprising configuring the at least one radial bearing component to exhibit a substantially spherical bearing surface.
14. The method according to claim 1 , further comprising that at least one of the radial bearing component and the thrust bearing component is configured as a tapered bearing component.
15. The method according to claim 1 , further comprising retaining the first cutting insert within the cavity by threadably coupling a retaining member with first cutting insert and positioning a spherical seat member between the retaining member and a portion of the housing.
16. The method according to claim 1 , wherein at least one of the at least one radial bearing component and the at least one thrust bearing component includes a rolling element.
17. The method according to claim 1 , further comprising providing the first cutting insert to include a table of superhard material bonded to a substrate, wherein a bearing surface is formed in the table of superhard material.
18. A method of drilling a subterranean formation, the method comprising:
providing a drill bit having a body, a first cutting insert coupled with the body via a first mounting system wherein the first mounting system to includes a housing having a pocket formed therein and housing at least a portion of the first cutting insert;
providing at least one bearing component between the first cutting insert and the housing; engaging a subterranean formation with the drill bit while rotating the drill bit about a first rotational axis;
rotating the first cutting insert about a second rotational axis relative to the housing while rotating the drill bit about the first rotational axis;
providing pressure compensation within the pocket in response to a change in external pressure experienced by the drill bit while the drill bit is engaging the subterranean formation.