Hydraulic action for rotary drill bits
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United States of America Patent
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-
Mar 17, 1992
Issued Date -
N/A
app pub date -
Nov 14, 1990
filing date -
Mar 30, 1990
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) directed toward an adjacent roller cutter (20A) and slanted toward the bore hole side wall away from a radial direction at a slant impact angle B for first impacting the side wall (34), and then sweeping in a high velocity stream along the corner surface (33) and inwardly across the bore hole bottom (32) at cutting element engagement locations (39).
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