E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 10/56 (2006.01) E21B 10/42 (2006.01)
Patent
CA 2517066
A rotary drag bit comprises a bit body and a plurality of blades extending radially away from the bit body, each blade including a cutting assembly. Each cutting assembly has a plurality of primary cutters orientated in the direction of rotation of the drill bit for drilling or boring into a subterranean rock formation, and a plurality of secondary or brute cutters located behind the primary cutters in relation to the direction of rotation of the drag bit. The invention is concerned primarily with the secondary cutters, which comprise a layer of superabrasive material, such as PCD, PCBN or CVD diamond, bonded to a support substrate. The interface between the superabrasive layer and the substrate has a stepped region that provides the cutter with a skirt or hoop of superabrasive extending into the substrate. The secondary cutter is orientated in use to present a bearing surface to the rock formation and a secondary cutting edge in the direction of rotation of the rotary bit.
Trépan rotatif à lames comportant un corps de trépan et plusieurs lames s'étendant radialement à partir du corps de trépan, chaque lame étant munie d'un ensemble de coupe. Chaque ensemble de coupe possède plusieurs outils primaires orientés dans le sens de rotation du trépan afin de forer ou de percer une formation rocheuse souterraine, et plusieurs outils secondaires ou bruts situés derrière les outils primaires dans le sens de rotation du trépan à lames. L'invention concerne principalement les outils secondaires, qui comportent une couche de matière fortement abrasive du type PCD, PCBN ou diamant CVD liée à un substrat. L'interface entre la couche de matière fortement abrasive et le substrat comprend une zone à épaulement conférant à l'outil de coupe une jupe ou frette de matière fortement abrasive s'étendant jusque dans la du substrat. L'outil secondaire est orienté, en position active, de telle manière qu'il présente une face d'appui venant au contact de la formation rocheuse, et une arête coupante secondaire dans le sens de rotation du trépan rotatif.
Achilles Roy Derrick
Parker Imraan
Tank Klaus
Element Six (proprietary) Limited
Mccarthy Tetrault Llp
LandOfFree
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