Split threads for fixing accessories to a body
An accessory is coupled to a body using a connection member inserted into a plurality of lateral recesses of a bore. The accessory includes a complementary connection mechanism to the connection member and is tightened in the bore with a torque. An example accessory is a nozzle for use with a drill bit. The nozzle includes threads and the drill bit includes a nozzle bore with lateral recesses. Partial thread segments are inserted into the lateral recesses, and the nozzle is threaded to the partial thread segments.
1. A downhole tool comprising:
a body including a first material, the body including at least one bore, wherein the at least one bore includes a plurality of lateral recesses;
at least one connection member positioned within the plurality of lateral recesses, wherein the at least one connection member comprises a threaded connection; and
an accessory including a second material fastened to the at least one connection member.
2. The downhole tool of claim 1 , each lateral recess of the plurality of lateral recesses including a recess surface, and the recess surface being tapered radially inward relative to an axis of the at least one bore.
3. The downhole tool of claim 2 , the at least one connection member including an outer surface, and the outer surface being complementarily shaped to the recess surface.
4. The downhole tool of claim 1 , the at least one connection member being coupled to the body in a lateral recess of the plurality of lateral recesses.
5. The downhole tool of claim 1 , at least one recess of the plurality of recesses having a sidewall, the at least one connection member being positioned in contact with the sidewall.
6. The downhole tool of claim 1 , the first material being a metal matrix composite.
7. The downhole tool of claim 1 , the at least one connection member being manufactured from tool steel.
8. The downhole tool of claim 1 , further comprising a plurality of connection members, and wherein each connection member of the plurality of connection members is connected by a flexible connector.
9. The downhole tool of claim 1 , further comprising a sealing ring located at the top and/or the bottom of the lateral recess.
10. The downhole tool of claim 1 , the at least one bore being continuous from an outer surface of the body to an inner conduit of the body.
11. A cutting tool comprising:
a body including a first material;
at least one cutting element fixed relative to the body;
at least one bore in the body, the at least one bore having an inner surface and a longitudinal axis, the at least one bore being continuous from an outer surface of the body to an inner conduit of the body;
a plurality of lateral recesses in the inner surface of the at least one bore in a radial direction away from the longitudinal axis, the plurality of lateral recesses disposed a longitudinal depth from the outer surface of the body; and
a plurality of lateral recess bridges, wherein each lateral recess bridge extends in a circumferential direction about the longitudinal axis, each lateral recess bridge is disposed at the longitudinal depth from the outer surface of the body, and each lateral recess bridge comprises a portion of the body between adjacent lateral recesses.
12. The cutting tool of claim 11 , each lateral recess of the plurality of lateral recesses having a rectangular lateral cross-section.
13. The cutting tool of claim 11 , each lateral recess of the plurality of lateral recesses having a recess surface, and the recess surface includes a radially inward taper.
14. The cutting tool of claim 11 , the plurality of lateral recess bridges have the same arc length.
15. A method for manufacturing a downhole tool, the method comprising:
providing a body, wherein the body includes at least one bore having an inner surface, wherein the inner surface includes a plurality of lateral recesses;
inserting at least one connection member into the plurality of lateral recesses; and
installing an accessory in the at least one bore by rotating an accessory connection adjacent the at least one connection member with a torque.
16. The method of claim 15 , wherein the torque is greater than 25 lbf (33.9 N m).
17. The method of claim 15 , wherein providing the body includes additively manufacturing the body from a metal matrix composite.
18. The method of claim 15 , wherein providing the body includes machining the at least one bore into the body.
19. The method of claim 15 , further comprising pinching the accessory at the accessory connection with the at least one connection member, wherein the at least one connection member and the accessory connection include matching threaded connections, and at least one lateral recess of the plurality of lateral recesses include a radially inward taper.
20. The method of claim 15 , wherein the at least one bore includes a nozzle bore and the accessory is a nozzle.