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US 5,289,889 AGranted
Roller cone core bit with spiral stabilizers
OwnerMarvin Gearhart, Johnny N. Castle +1inventors
InventorsMarvin Gearhart, Johnny N. Castle, Paul G. Parys
Life of this patent
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Abstract
This invention relates to an improved roller cone coring bit that includes spiral stabilizer blades on the bit body. The spiral stabilizer blades reduce the whirling tendency of the bit, thereby enhancing the ability to cut and recover a continuous core.
Claims5
An improved roller cone core bit comprising:
- a cylindrical bit body having a means for connecting the core bit to a drillstring on one end and a plurality of journal segment arms on the other end;
- a plurality of core cutters, the cone cutters being rotatably mounted on journals which extend downward from the journal segment arms;
- and
- a plurality of stabilizer blades fixedly attached to the circumference of the bit body, each stabilizer blade oriented spirally about the longitudinal axis of the bit body.
1 more element
Dependencies are inferred from the claim text.