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US 7,740,090 B2Granted
Stress relief feature on PDC cutter
AssigneeSmith International, Inc.
InventorsYuelin Shen, John Youhe Zhang
Life of this patent
Estimating the term…
Abstract
A cutter having a base portion, an ultrahard layer disposed on the base portion, and at least one relief groove formed on an outer surface of the cutter. The at least one relief groove is configured to form a relief gap between the ultrahard layer and an inside surface of a cutter pocket.
Claims10
A drill bit comprising:
- a bit body having at least one cutter pocket;
- at least one cutter disposed in the at least pocket, the at least one cutter comprising a base portion, an ultrahard layer disposed on said base portion, and at least one relief groove formed on an outer surface of the ultrahard layer of the cutter, wherein the at least one relief groove extends backward from a cutting face a selected distance past an interface of the ultrahard layer and the base portion, and
- a relief gap formed between the at least one relief groove and an inside surface of the at least one cutter pocket.
A method of drilling, comprising:
- contacting a formation with a drill bit, wherein the drill bit comprises a bit body having at least one cutter pocket;
- and at least one cutter disposed in the at least one cutter pocket, the at least one cutter comprising a base portion, an ultrahard layer disposed on said base portion, and at least one relief groove formed on an outer surface of the ultrahard layer of the cutter, wherein the at least one relief groove extends backward from a cutting face a selected distance past an interface of the ultrahard layer and the base portion, and a relief gap formed between the at least one relief groove and an inside surface of the at least one cutter pocket of a blade.
A method of forming a relief gap in a cutter pocket of a drill bit, the method comprising:
- forming a cutter comprising:
- a base portion;
- an ultrahard layer disposed on the base portion;
- and
- at least one relief groove formed on an outer surface of the ultrahard layer of the cutter, wherein the at least one relief groove extends backward from a cutting face a selected distance past an interface of the ultrahard layer and the base portion;
- and
- inserting the cutter in the cutter pocket, wherein the at least one relief groove is disposed within the cutter pocket.
4 more elements
A drill bit comprising:
- a bit body having at least one cutter pocket;
- at least one cutter disposed in the at least one cutter pocket, the at least one cutter comprising a base portion, a diamond table sintered to said base portion, and at least one relief groove subsequently formed on an outer surface of the diamond table of the cutter, wherein the at least one relief groove extends backward from a cutting face a selected distance past an interface of the diamond table and the base portion, and
- a relief gap formed between the at least one relief groove and an inside surface of the at least one cutter pocket.
Dependencies are inferred from the claim text.