PDC cutter for high compressive strength and highly abrasive formations

US20070235230A1Inactive Publication Date: 2007-10-11VAREL INT IND
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Patent Information

Authority / Receiving Office
US · United States
Current Assignee / Owner
VAREL INT IND
Publication Date
2007-10-11
Estimated Expiration
Not applicable · inactive patent

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Abstract

A PDC cutter utilizes the combination of an elliptical shape with higher thermal resistance obtained through leaching to provide a cutter which is more effective than a cutter using either concept alone. The PDC cutter includes a tungsten carbide portion with protrusions extending from a surface thereof in a pattern. The diamond volume is mounted to the surface wherein the protrusions allow for the diamond volume to be larger about a perimeter edge of the cutter and smaller / shallower in a center region of the cutter. The protrusions providing surfaces for the diamond layer (table) to bond to the underlying tungsten carbide portion. With this configuration, diamond volume is maximized around the edge of the cutter.
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Description

CROSS REFERENCE TO RELATED APPLICATION

[0001] The present application claims the benefit of U.S. Provisional Application for Patent No. 60 / 751,835 filed Dec. 20, 2005, the disclosure of which is hereby incorporated by reference.BACKGROUND OF THE INVENTION

[0002] 1. Technical Field of the Invention

[0003] The present invention relates to a PDC cutter used for drilling boreholes into the earth.

[0004] 2. Description of Related Art

[0005] Drilling high compressive strength rocks that are highly abrasive has always been a challenge for PDC cutters. When a rock has a high compressive strength, high force is required for the cutter to penetrate the rock. High cutting forces cause problems. When the high cutting forces are transmitted to the drill string, drilling problems occur. For example, the drill string can buckle or bow causing unwanted deviation of the well. High forces cause problems within the cutter. The higher forces cause more frictional heating. The heating causes rapid wear ...

Claims

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