Earth-boring drill bits with enhanced formation cuttings removal features
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United States of America Patent
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Jun 26, 2001
Grant Date -
N/A
app pub date -
Jan 24, 2000
filing date -
Sep 19, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Rotary drag bits with enhanced formation cuttings removal achieved by apportioning drilling fluid flow in relationship to cuttings volume generated by various groups of cutters on the bit, each cutter group being located on a different blade of the bit. The flow apportionment may be effected by selective placement of nozzles on the bit face, employing different sized nozzles, by varying the orientation of similarly-sized nozzles, or by a combination of approaches. In addition, the transverse cross-sectional areas of the junk slots associated with each of the various blades are sized in similar proportion to the formation cuttings volume removed by each of the cutter groups. Finally, cuttings volumes from each blade of a particular type or category, such as primary, secondary, tertiary, are substantially mutually balanced with the volumes of the other blades of the same type or category.
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