Roller cone drill bit structure having improved journal...

Details Roller cone drill bit structure having improved journal... Roller cone drill bit structure having improved journal...

E - Fixed Constructions

21

B

E21B 10/08 (2006.01) E21B 10/16 (2006.01)

Patent

CA 2366198

A roller cone drill bit is shown which includes at least one roller cone rotatably mounted on a journal forming a part of a bit body. The at least one cone having cutting elements disposed at selected locations thereon. The at least one roller cone subtends a journal angle of less than about 35 degrees, and has an offset less than about 0.15 inches. In one embodiment, gage row cutting elements on the at least one roller cone define an oversize angle in a range of about - 1.5 to +2 degrees.

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