Drilling and/or coring tool

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 10/54 (2006.01) E21B 10/00 (2006.01) E21B 10/42 (2006.01) E21B 10/48 (2006.01)

Patent

CA 2274152

A drill and/or core tool, in particular for oil drilling and/or coring, comprising a body (2) showing a substantially cylindrical peripheral surface (3) and a front (4), blades (5) which extend from the front (4) till over the peripheral surface (3) and which show each a leading edge (6), possibly PDC cutting elements (7) which are situated at least in a central area (15A) of the front (4) and the longitudinal axes of which are transverse to the rotation axis of the tool (1), and comprising moreover, on at least one blade (5), outside said central area (15A): PDC (7C) and/or secondary (10) cutting elements which show each a cutting edge (8), forming together the leading edge (6) of the blade (5), and the longitudinal axis of which is transverse to the rotation axis, and at least one associated cutting element (10A) which is situated behind at least one of the PDC (7C) or secondary (10) cutting elements, which shows a cross-section of the same shape, at least for its portion protruding from the blade (5), than that of the PDC (7C) or secondary (10) cutting element, and which is disposed on the same blade (5).

Outil de forage et/ou de carottage, en particulier pour du forage et/ou du carottage pétrolier, comprenant un corps (2) présentant une surface périphérique (3) sensiblement cylindrique et une face antérieure (4), des lames (5) qui s'étendent depuis la face antérieure (4) jusque sur la surface périphérique (3) et qui présentent chacune un bord d'attaque (6), le cas échéant des éléments coupants en PDC (7) qui sont situés au moins dans une zone centrale (15A) de la face antérieure (4) et dont les axes longitudinaux sont transversaux à l'axe de rotation de l'outil (1), et comportant de plus, en dehors de ladite zone centrale (15A) et sur au moins une lame (5): des éléments coupants en PDC et/ou secondaires (10) qui présentent chacun une arête de coupe (8), formant ensemble le bord d'attaque (6) de la lame (5), et dont l'axe longitudinal est transversal à l'axe de rotation, et au moins un élément coupant associé (10A) qui est situé derrière au moins un des éléments coupants en PDC ou secondaires (10), qui présente une section transversale de même forme, du moins pour sa partie en saillie de la lame (5), que celle de l'élément coupant en PDC ou secondaire (10), et qui est disposé sur la même lame (5).

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