Superhard cutting element having reduced surface roughness and method of modifying
AssigneeBaker Hughes Incorporated
InventorsJeffrey B. Lund, Redd H. Smith
Life of this patent
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Abstract
A superhard cutting element having a polished, low friction, substantially planar cutting face with a surface finish roughness of 10 .mu. in. or less and preferably 0.5 .mu. in. or less.
Claims26
A cutting element for drilling subterranean formations, comprising a substantially planar table of superhard material, said table having a cutting face, at least a portion of which cutting face possesses a surface finish of about 10 .mu. in. or less roughness.
A rotary drag bit for drilling subterranean formations, comprising:
- a bit body having a shank secured thereto for connection of said rotary drag bit to a drill
- string;
- a face on said bit body;
- a plurality of superhard cutting elements disposed on said bit body face, at least one of said superhard cutting elements having a substantially planar superhard cutting face including at least a portion with a surface finish of about 10 .mu. in. or less roughness.
A cutting element for drilling subterranean formations, comprising a mass of superhard material defining a substantially planar cutting face, said cutting face having at least a portion with a surface finish of about 10 .mu. in. or less roughness.
A cutting element comprising a table of superhard material supported by a substrate and having a substantially planar cutting face, at least a portion of which is polished to a substantial mirror finish.
A method of modifying a superhard cutting element having a superhard cutting face with a surface finish in the range of about 20-40 .mu. in., comprising smoothing and polishing at least a portion of said cutting face to a surface finish of about 10 .mu. in. or less.
Dependencies are inferred from the claim text.