Boring or penetrating the earth – Bit or bit element – Magnetized or with magnet
Patent
1987-10-19
1989-03-21
Dang, Hoang C.
Boring or penetrating the earth
Bit or bit element
Magnetized or with magnet
175379, 175393, 175411, 175421, E21B 1046, E21B 1060
Patent
active
048135003
ABSTRACT:
A fishtail type drag bit having abradable cutter blades attached to a body of the bit is disclosed. A multiplicity of axially aligned tubes are welded together to form a blade each blade being sustantially parallel with an axis of the bit body. Each tube of the blade contains an annulus of a diamond cutter material matrix. The center of the annulus forms a fluid conduit that communicates with a fluid plenum chamber formed by the body of the bit. The cutting edge of the diamond matrix therefore, is always immediately adjacent the fluid nozzle regardless of the degree of blade erosion during operation of the bit in a subterranean formation.
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Dang Hoang C.
Smith International Inc.
Upton Robert G.
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