Hydraulic action for rotary drill bits

Details Hydraulic action for rotary drill bits Hydraulic action for rotary drill bits

E - Fixed Constructions

21

B

E21B 10/18 (2006.01)

Patent

CA 2048398

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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