Drill bit and cutter therefor
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United States of America Patent
Stats
-
Jun 30, 1987
Issued Date -
N/A
app pub date -
Jan 29, 1986
filing date -
Nov 22, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A full bore drag-type well drilling bit comprises a bit body having an operating end face defining a plurality of upsets. Each of the upsets has a leading edge surface and at least one recess extending through the leading edge surface into the upset. The end face of the bit body further comprises a plurality of flow channels, each such leading edge surface having one such flow channel extending therealong and inset therefrom. At least some of the upsets have a plurality of such recesses spaced therealong. The bit body further has a plurality of circulation ports opening through its end face and a plurality of nozzles, each nozzle being mounted in a respective one of the ports. The number of nozzles is less than the number of flow channels. At least some of the nozzles communicate with more than one such flow channel, and the transverse cross-sectional flow area of each of the nozzles is substantially less than those of individual ones of the channels communicating therewith. The bit further comprises a plurality of cutting members each mounted in a respective one of the recesses with a cutting face thereof facing outwardly along the leading edge surface of the respective upset.
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