Method of manufacturing PDC cutters with chambers or passages

Details Method of manufacturing PDC cutters with chambers or passages Method of manufacturing PDC cutters with chambers or passages

2006-01-17

2006-01-17

Ashley, Boyer D. (Department: 3724)

Metal tools and implements, making

Blank or process

Drill

C076SDIG011, C076SDIG012, C419S028000, C175S393000, C164S132000

Reexamination Certificate

active

06986297

ABSTRACT:
A cutting element for a drill bit used in drilling subterranean formations is formed with an internal chamber or passage for the flow of drilling fluid therethrough. The cutting element includes a substrate having at least one internal passage, and prior to attaching a superabrasive table thereto, the at least one internal passage is filled with a removable, substantially incompressible filler material. Attachment or bonding of the superabrasive table to the substrate under high temperature and high pressure is accomplished without significant distortion of the shape and size of the internal passage. The filler material may be a crystalline salt such as sodium chloride or halite, which is removable by dissolution in water, or may be boron nitride or a volcanic material such as Pyrofolyte material which is mechanically removable.

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