Methods of forming downhole tools having features for reducing balling
Downhole tools with a topographical pattern, and anti-balling material over the topographical pattern. The topographical pattern may be defined by at least one of a plurality of recesses extending into a surface of a body of the tool and a plurality of protrusions protruding from the surface. Downhole tools include an insert disposed within a recess in a body, and the insert comprises an anti-balling material having a composition selected to reduce accumulation of formation cuttings on the tools when the tools are used to form or service a wellbore. Downhole tools include anti-balling material disposed over a porous mass provided over the surfaces of the tools. Methods of forming downhole tools include providing anti-balling material over features on and/or in a surface of a body of a tool. Methods of repairing downhole tools include removing an insert therefrom and disposing a replacement insert therein.
1. A method of repairing a downhole tool, comprising:
removing an insert from a recess on a bottom surface of a fluid course located between a rotationally leading surface of a first blade of a body of the downhole tool and a rotationally trailing surface of a second, adjacent blade of the body;
disposing a replacement insert within the recess, the replacement insert having an anti-balling material selected to have a composition for reducing accumulation of formation cuttings thereon when the downhole tool is used to remove formation material from a subterranean formation; and
attaching the replacement insert to the body of the downhole tool at least partially within the recess.
2. The method of claim 1 , wherein removing an insert from a recess comprises removing a worn insert from a recess of the downhole tool.
3. The method of claim 1 , wherein removing an insert from a recess comprises prising the insert from the recess.
4. The method of claim 1 , wherein removing an insert from a recess comprises removing a bolt coupled to the insert.
5. The method of claim 1 , wherein attaching the replacement insert to the body of the downhole tool comprises mechanically locking the replacement insert to the body of the downhole tool.
6. The method of claim 1 , wherein attaching the replacement insert to the body of the downhole tool comprises pressing the replacement insert into the recess.
7. The method of claim 1 , wherein attaching the replacement insert to the body of the downhole tool comprises securing the replacement insert in the recess by a shrink-fit.
8. The method of claim 1 , wherein attaching the replacement insert to the body of the downhole tool comprises brazing the replacement insert into the recess.
9. The method of claim 1 , wherein attaching the replacement insert to the body of the downhole tool comprises welding the replacement insert into the recess.
10. The method of claim 1 , wherein the anti-balling material comprises at least one material selected from the group consisting of a fluoropolymer, a urethane, and an epoxy.
11. The method of claim 1 , wherein the anti-balling material comprises at least one material selected from the group consisting of a metal, a metal alloy, and a ceramic.
12. The method of claim 1 , wherein the anti-balling material comprises at least one material selected from the group consisting of graphite, molybdenum disulfide, boron nitride, and silicone.
13. The method of claim 1 , wherein attaching the replacement insert to the body comprises securing a chip splitter having at least one sharp exposed edge at least partially within the recess.
14. The method of claim 1 , wherein the replacement insert is configured to have a coefficient of friction different from a coefficient of friction of the insert.
15. The method of claim 1 , wherein the replacement insert is configured to have a coefficient of friction below about 0.04.
16. The method of claim 1 , wherein the replacement insert is configured to have a hydrophobicity different from a hydrophobicity of the insert.
17. The method of claim 1 , wherein the anti-balling material has a contact angle with water droplets greater than 90°.
18. The method of claim 1 , wherein the anti-balling material comprises a polymer and a metal material.