Nozzle means for rotary drill bits

Details Nozzle means for rotary drill bits Nozzle means for rotary drill bits

E - Fixed Constructions

21

B

255/73

E21B 10/18 (2006.01)

Patent

CA 2022495

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.

Trépan rotatif (10) comportant des duses d'évacuation des fluides (36A, 36B, 36C) placées entre des paires adjacentes de tricônes (20A, 20B, 20C). Une duse d'évacuation des fluides (36A) fournit un courant de fluides de forage (44) se dirigeant vers un tricône (20A) adjacent qui est incliné radialement vers l'extérieur, vers la paroi latérale (34) du trou de forage (30), et vers le tricône (20A) pour frapper premièrement la paroi latérale (34). Ensuite, les fluides balaient vers l'intérieur le fond du trou de forage (32) dans un courant plat à haute vitesse tangenciel à la rotation du trépan et sous les éléments taillants (26) pendant que la surface d'attaque (28D) taille la formation.

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