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US 5,161,898 AGranted
Aluminide coated bearing elements for roller cutter drill bits
AssigneeCamco International Inc.
InventorEric F. Drake
Life of this patent
Estimating the term…
Abstract
A roller cutter drill bit (10) has separate bearing elements (82, 84, 86) positioned between a journal (20) and a roller cutter (60) mounted for rotation on the journal (20). The bearing elements (82, 84, 86) are formed of a superalloy material and the bearing surfaces of the bearing elements (82, 84, 86) have an aluminide coating applied thereon to form a bearing surface stable at operating temperatures over 500 F. and as high as 1000 F.
Claims6
A roller cutter drill bit for drilling a well bore and comprising:
- a bit body having an upper end adapted to be detachably connected to a drill string for the drill bit;
- a leg projecting from said body and having a journal on its lower end;
- a roller cutter mounted for rotation on said journal;
- and
- a separate sliding bearing element positioned between said roller cutter and said journal, said bearing element having at least one bearing surface comprising an aluminide coated superalloy bearing material selected from the group consisting of nickel, cobalt, and iron.
2 more elements
Dependencies are inferred from the claim text.