E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 10/24 (2006.01) E21B 10/22 (2006.01)
Patent
CA 2330987
A rotary cone rock bit, comprises a bit body including a plurality of legs extending therefrom, each of the legs having an outer surface that includes a leading surface and a trailing surface, a roller cone rotatably supported on each of the legs, a bearing system between each cone and the leg on which it is supported, and a lubricant reservoir in fluid communication with the bearing system. The reservoir can be provided with a wear resistant plug, if desired. In the present bit, the reservoir can be pressured-balanced with fluid in the bit plenum or the borehole annulus, or maintained at some desired differential with respect to either of these. Alternatively, the reservoir can be formed inside the bit body, preferably by means of a canister, which can be provided with venting means as desired.
Cariveau Peter T.
Conn William M.
Didericksen Roger
Norris Kirk A.
Slaughter Robert H. Jr.
Deeth Williams Wall Llp
Smith International Inc.
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