Drag drill bit having improved flow of drilling fluid

Details Drag drill bit having improved flow of drilling fluid Drag drill bit having improved flow of drilling fluid

E - Fixed Constructions

21

B

255/68

E21B 10/60 (2006.01) E21B 10/42 (2006.01)

Patent

CA 1289553

DRAG DRILL BIT HAVING IMPROVED FLOW OF DRILLING FLUID Abstract of the Disclosure A drag type rotary bit (10) having polycrystaline diamond compact (PDC) cutting elements arranged in a plurality of rows extending from the center of the bit body (12) to the outer peripheral surface (20) thereof. A fluid discharge nozzle (38A-38F) is provided for each row of cutting elements (36A-36G) and has a fluid discharge stream (62) directed downwardly against the bore hole bottom (66) and opposite the direction of rotation of the bit (10) ahead of the associated row of cutting elements (36A-36G) for flowing against the cutting faces (53) of the cutting elements (36A-36G) after impingement of the bore hole bottom (66).

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