Rotary drill bits for use in coring holes in subsurface formations
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United States of America Patent
Stats
-
Dec 13, 1988
Grant Date -
N/A
app pub date -
Jun 26, 1986
filing date -
Jul 2, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A rotary drill bit for use in coring holes in subsurface formations comprises a bit body having a shank for connection to a core barrel, an outer peripheral gauge portion for engagement with the peripheral wall of the hole being drilled, an inner peripheral gauge portion defining at least a part of a central, generally circular aperture extending axially through the bit body, a plurality of cutting elements mounted at the surface of the bit body, and passages in the bit body for delivering drilling fluid to the surface of the bit body. Hydraulic sealing means are provided on the inner gauge portion of the bit and, in use, engage the outer surface of the core being cut by the bit. The hydraulic seal thus formed prevents or restricts flow of drilling fluid in an axial direction between the inner gauge portion and the core, and thus substantially reduces erosion of the core.
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