Drilling tool formed of a core-and-casing assembly
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United States of America Patent
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Mar 21, 1989
Grant Date -
N/A
app pub date -
Jan 14, 1987
filing date -
Jan 18, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A drilling tool which has at least one helical fluid flow channel at its interior, is composed of a hard metal core having an exterior surface and a hard metal tubular casing having an interior surface. The casing encloses the core with their surfaces in firm contact so that the core and casing form a composite body. Each channel is formed as a groove in the surface of the core or casing.
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