E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
255/69
E21B 10/00 (2006.01) B28D 1/04 (2006.01) E21B 10/48 (2006.01) E21B 10/56 (2006.01)
Patent
CA 2013804
A rotatable crown for a rotary drill comprising a working end and an opposite end for engagement in a drill rod, stringer or adaptor coupling, the working end having a cutting face and a plurality of discrete, spaced, elongate cutting elements located in the cutting face, each cutting element: (1) being of square or rectangular cross-section; (2) presenting a cutting point which is defined by a corner of the element; (3) having a longitudinal axis which extends behind the cutting face; and (4) being made of thermally stable abrasive compact. The crown has particular application for the drilling of substrates having a compressive strength of at least 180MPa such as Paarl granite, Norite Gabbro and Reef Quartzite.
Cette invention concerne une couronne de trépan de forage ayant une extrémité travaillante et une extrémité opposée de montage en bout de tige de sonde ou sur adaptateur d'accouplement, l'extrémité travaillante comportant une face de coupe et une série d'organes de coupe, allongés, distincts et espacés, chacun ayant (1) une section carrée ou rectangulaire; (2) un point de coupe défini par un de ses angles; (3) un axe longitudinal qui se prolonge au-delà de la face de coupe; et (4) un corps fait d'aggloméré abrasif thermostable. L'objet de l'invention est particulièrement adapté au forage de formations ayant une résistance à la compression d'au moins 180 Mpa, notamment le granit Paarl, le gabbro norite et le quartzite récifal.
Clark Ian Eric
Stewart Aulette
de Beers Industrial Diamond Division (pty) Limited
Gowling Lafleur Henderson Llp
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