Drilling head

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 10/54 (2006.01) E21B 10/46 (2006.01)

Patent

CA 2274918

A drill bit as used in particular in the oil well drilling field comprising a central body (2), cutting blades (3) protruding with respect to the body (2), both at the front of this body according to a drill direction and at the sides of this same body (2), and cutting elements (9) divided over an outer front surface (10) and over an outer lateral well sizing surface (11) comprised by each blade (3), wherein there are provided as cutting elements : in a central area (13) of the front surface (10), on at least one blade (3): at least one synthetic polycrystalline diamond compact cutting disc (12), and in a remaining area (14) of the front surface (10) of this blade, situated beyond said central area (13) with respect to the rotation axis, and on the other blades : thermally stable synthetic diamonds and/or impregnated diamond particles.

Tête de forage, telle qu'utilisée notamment dans le domaine d'un creusement de puits de pétrole, comportant un corps central (2), des lames de coupe (3) en saillie par rapport au corps (2), tant en avant de celui-ci suivant un sens de forage que sur les côtés de ce même corps (2), et des éléments coupants (9) répartis sur une surface externe frontale (10) et sur une surface externe latérale (11) de calibrage du puits que comportent chaque lame (3), dans laquelle il est agencé en tant qu'éléments coupants: dans une zone centrale (13) de la surface frontale (10), sur au moins une lame (3): au moins une plaquette de coupe (12) en comprimé de diamant polycristallin synthétique, et dans une zone restante (14), de la surface frontale (10) de cette lame, située au-delà de ladite zone centrale (13) par rapport à l'axe de rotation, et sur les autres lames: des diamants synthétiques thermostables et/ou des particules de diamant imprégnées.

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