EP 0916804 A1 19990519 - Polycrystalline diamond cutting element
Title (en)
Polycrystalline diamond cutting element
Title (de)
Polykristallines Diamant-Schneidelement
Title (fr)
Elément de coupe en diamant polycristallin
Publication
Application
Priority
EP 97309188 A 19971114
Abstract (en)
The present invention relates to a novel domed polycrystalline diamond cutting element (10) wherein a hemispherical diamond layer (14) is bonded to a tungsten carbide substrate (16), commonly referred to as a tungsten carbide stud. Broadly, the inventive cutting element includes a metal carbide stud having a proximal end adapted to be placed into a drill bit (12) and a distal end portion. A layer of cutting polycrystalline abrasive material disposed over said distal end portion such that an annulus (20) of metal carbide adjacent and above said drill bit is not covered by said abrasive material layer. The geometry of the diamond cutting element provides control of interfacial stresses and reduces fabrication costs. The diamond cutting element may contain a pattern of ridges or bumps integrally formed in the abrasive layer which ridges are designed to cause high localized stresses in the rock, thus starting a crack. By initiating cracks in localized areas, the crushing action could be performed with less force. <IMAGE>
IPC 1-7
IPC 8 full level
E21B 10/56 (2006.01); E21B 10/567 (2006.01)
CPC (source: EP US)
E21B 10/5671 (2020.05 - EP US); E21B 10/5673 (2013.01 - EP US)
Citation (applicant)
- US 3136615 A 19640609 - BOVENKERK HAROLD P, et al
- US 3141746 A 19640721 - DE LAI ANTHONY J
- US 3233988 A 19660208 - WENTORF JR ROBERT H, et al
- US 3743489 A 19730703 - WENTORF R, et al
- US 3745623 A 19730717 - WENTORF R, et al
- US 3767371 A 19731023 - WENTORF R, et al
- US 4109737 A 19780829 - BOVENKERK HAROLD P
- US 5374854 A 19941220 - CHEN SHIH-TSAN [TW]
- US 5329854 A 19940719 - KOMSTADIUS SVEN [SE], et al
Citation (search report)
- [XY] EP 0356097 A2 19900228 - DE BEERS IND DIAMOND [ZA]
- [X] WO 9603567 A1 19960208 - FLOWDRIL CORP [US]
- [YD] US 4109737 A 19780829 - BOVENKERK HAROLD P
- [Y] US 4984642 A 19910115 - RENARD PAUL [FR], et al
- [A] US 5154245 A 19921013 - WALDENSTROEM MATS G [SE], et al
- [A] EP 0322214 A1 19890628 - DE BEERS IND DIAMOND [ZA]
- [A] GB 2270493 A 19940316 - GEN ELECTRIC [US]
Designated contracting state (EPC)
BE DE ES FR GB IE IT
DOCDB simple family (publication)
DOCDB simple family (application)
EP 97309188 A 19971114