Nozzle means for rotary drill bits
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United States of America Patent
Stats
-
Jul 9, 1991
Issued Date -
N/A
app pub date -
Mar 30, 1990
filing date -
Jul 17, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A rotary drill bit (10) has fluid discharge nozzles (36A, 36B, 36C) positioned between adjacent pairs of roller cutters (20A, 20B, 20C). A fluid discharge nozzle (36A) provides a stream of drilling fluid (44) toward an adjacent roller cutter (20A) inclined radially outwardly toward the side wall (34) of the bore hole (30) and slanted toward the roller cutter (20A) for first striking the side wall (34), and then sweeping inwardly across the bore hole bottom (32) in a flat high velocity stream tangential to bit rotation and beneath the cutting elements (26) during cutting engagement of the gage row (28D) with the formation.
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