CPC E21B 4/003 (2013.01) [E21B 10/573 (2013.01)] | 27 Claims |
1. A downhole tool, the downhole tool comprising:
a bearing housing;
a drive shaft coupled with the bearing housing, wherein one of the bearing housing and the drive shaft comprises a metal bearing surface, the metal bearing surface comprising a metal that contains at least 2 weight percent of iron, cobalt, nickel, ruthenium, rhodium, palladium, chromium, manganese, copper, titanium, tantalum, or combinations thereof based on a total weight of the metal; and
a polycrystalline diamond bearing element having a diamond bearing surface, wherein the polycrystalline diamond bearing element is positioned relative to the bearing housing and the drive shaft such that the diamond bearing surface is engaged with the metal bearing surface.
|