Boring or penetrating the earth – With means movable relative to tool to receive – retain – or... – Core-retaining or severing means
Patent
1986-06-26
1988-12-13
Dang, Hoang C.
Boring or penetrating the earth
With means movable relative to tool to receive, retain, or...
Core-retaining or severing means
175403, E21B 1002
Patent
active
047903961
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.
REFERENCES:
patent: 1484527 (1924-02-01), Pace
patent: 1703390 (1929-02-01), Duffy
patent: 2657016 (1953-10-01), Grable
patent: 3095935 (1963-07-01), Hildebrandt et al.
patent: 4296822 (1981-10-01), Ormsby
Dang Hoang C.
NL Petroleum Products Limited
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