US 7,320,375 B2
Split cone bit
Amardeep Singh, Houston, Tex. (US)
Assigned to Smith International, Inc., Houston, Tex. (US)
Filed on Jul. 19, 2005, as Appl. No. 11/184,719.
Prior Publication US 2007/0017709 A1, Jan. 25, 2007
Int. Cl. E21B 10/25 (2006.01)
U.S. Cl. 175—365  [175/369; 175/371; 175/331] 19 Claims
OG exemplary drawing
 
1. A roller cone drill bit comprising:
a bit body configured to be coupled to a drill string;
a journal depending from the bit body;
a split roller cone rotatably attached to the journal, wherein the split roller cone comprises,
an upper section, the upper section having a plurality of cutting elements disposed at selected positions thereon, and
a lower section, the lower section having a plurality of cutting elements disposed at selected positions thereon, wherein the lower section is able to rotate independently of the upper section; and
a seal disposed between the upper section and the lower section.