Cutting structure for roller cone drill bits
AssigneeSmith International, Inc.
InventorsAmardeep Singh, Sujian Huang
Life of this patent
Estimating the term…
Abstract
The invention relates to a roller cone drill bit for drilling earth formations. The drill bit includes a bit body and a plurality of roller cones attached to the bit body and able to rotate with respect to the bit body. Each roller cone of the bit includes a truncated apex and a side surface. The drill bit further includes a plurality of cutting elements disposed on the side surface of each cone. The cutting elements on at least one cone are arranged such that at least one cutting element on that cone extends past an axis of rotation of the bit body as the bit is rotated. In one embodiment, the drill bit includes three cones and the cutting elements are arranged on the cones so that cutting elements on adjacent cones intermesh between the cones.
Claims22
A roller cone drill bit, comprising:
- a bit body;
- a plurality of roller cones attached to the bit body and able to rotate with respect to the bit body, each cone comprising a truncated apex and a side surface;
- a plurality of cutting elements disposed on the side surface of each of the cones, the cutting elements being arranged such that at least one of the cutting elements on at least one of the cones extends past an axis of rotation of the bit body as the bit is rotated and defines a core percentage of about 10 percent or less.
A roller cone drill bit, comprising:
- a bit body;
- a plurality of roller cones attached to the bit body and able to rotate with respect to the bit body, each cone comprising a truncated apex and a side surface;
- and
- a plurality of cutting elements arranged on the side surface of each of the cones,
- on one of the cones, the cutting elements being arranged in at least three rows and such that at least one of the cutting elements extends past an axis of rotation of the bit body as the bit is rotated.
Dependencies are inferred from the claim text.