E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
255/73
E21B 10/18 (2006.01) E21B 10/16 (2006.01)
Patent
CA 2017533
A rotary drill bit.(10) has three roller cutters (20A, 20B and 20C) mounted thereon for rotation with a plurality of cutting elements (26) arranged in concentric annular rows (28A, 28B, 28C, 28D) thereon. A high velocity drilling fluid is discharged from nozzle orifices (40, 42, 52) and the orifices are sized and positioned so that more hydraulic energy is directed against the cutting elements (26) in the gage row (28D) than against the cutting elements (26) in the remaining rows (28A, 28B, 28C). The drilling fluid impinges the cutting elements (26) on the leading side of the roller cutters (20A, 20B, 20C) immediately prior to engagement of the cutting elements (26) with the bore hole bottom (30) and then sequentially strikes the bore hole bottom formation at or closely adjacent the juncture (35) of the horizontal bottom portion (32) with the vertical side portion (34). ,
L'invention vise un trépan de perforatrice rotative (10) à trois molettes (20A, 20B et 20C) comportant plusieurs éléments de coupe (26) disposés en rangs concentriques (28A, 28B, 28C et 28D). Un fluide de forage haute vitesse est éjecté par des orifices d'ajutage (40, 42, 52) et les orifices sont dimensionnés et positionnés de manière à diriger une plus grande quantité d'énergie hydraulique sur les éléments de coupe (26) dans le rang de jaugeage (28D) que sur les éléments de coupe (26) dans les autres rangs (28A, 28B, 28C). Le fluide de forage percute les éléments de coupe (26) sur le côté attaque des molettes (20A, 20B, 20C) immédiatement avant que les éléments de coupe (26) ne s'engagent dans le fond du sondage et, ensuite, frappe en séquence la formation au fond du sondage à la jonction (35), ou à proximité de celle-ci, entre la partie horizontale du fond (32) et la partie verticale (34).
Deane John D.
Ivie Craig R.
Camco International (uk) Limited
Smart & Biggar
LandOfFree
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