Global Patent Index - EP 0291314 A2

EP 0291314 A2 1988-11-17 - Cutting structure and rotary drill bit comprising such a structure.

Title (en)

Cutting structure and rotary drill bit comprising such a structure.

Title (de)

Schneidelement und Drehbohrmeissel mit einem derartigen Element.

Title (fr)

Structure de coupe et trépan de forage rotatif comportant une telle structure.

Publication

EP 0291314 A2 (EN)

Application

EP 88304325 A

Priority

GB 8711255 A

Abstract (en)

A cutting structure, for use in a rotary drill bit for drilling or coring holes in subsurface formations, comprises an elongate stud 17 of hard material, such as cemented tungsten carbide, there being at least partly embedded in the stud, at one end thereof, one or more thermally stable polycrystalline diamond cutting elements 14, 15, 16. The diamond elements, which may be in the form of small rectangular blocks or cylinders, are bonded into the stud by a hot pressing or an infiltration process.

IPC 1-7 (main, further and additional classification)

B22F 7/06; E21B 10/56

IPC 8 full level (invention and additional information)

B22F 7/06 (2006.01); E21B 10/56 (2006.01); E21B 10/567 (2006.01)

CPC (invention and additional information)

E21B 10/567 (2013.01); B22F 7/06 (2013.01); E21B 10/5673 (2013.01)

Designated contracting state (EPC)

BE CH DE FR GB LI NL SE

DOCDB simple family

EP 0291314 A2 19881117; EP 0291314 A3 19890920; GB 2204625 A 19881116; GB 8711255 D0 19870617; GB 8811390 D0 19880615