E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 10/00 (2006.01) B22F 7/06 (2006.01) E21B 10/62 (2006.01)
Patent
CA 2630917
Methods of forming earth-boring rotary drill bits (50) include providing a bit body (52), providing a shank(70) that is configured for attachment to a drill string, and attaching the shank to the bit body. Providing a bit body includes providing a green powder component having a first region (54) having a first composition and a second region (56) having a second, different composition, and at least partially sintering the green powder component. Other methods include providing a powder mixture, pressing the powder mixture to form a green component, and sintering the green component to a final density. A shank(70) is provided that includes an aperture (72), and a feature(60) is machined in a surface of the bit body. The aperture is aligned with the feature, and a retaining member (80) is inserted through the aperture. An earth-boring bit includes a bit body comprising a particle-matrix composite material including a plurality of hard particles dispersed throughout a matrix material. A shank is attached to the bit body using a retaining member.
La présente invention concerne des procédés destinés à former des trépans rotatifs de forage de terrain consistant à constituer un corps de trépan, à disposer d~une tige conçue pour une fixation à un train de forage et à fixer la tige au corps. Pour constituer un corps de trépan, on se procure un composant de poudre cru ayant (5) une première partie d~une première composition et une seconde partie d~une seconde autre composition, et on fritte au moins partiellement le composant de poudre cru. D~autres procédés consistent à constituer un mélange en poudre, à compresser ce mélange pour former un composant cru et à fritter le composant selon une densité finale. Une tige comprenant une ouverture est obtenue, et un dispositif est usiné dans une surface du corps de trépan. L~ouverture est (10) alignée avec le dispositif, et un élément de retenue est inséré à travers l~ouverture. Un trépan de forage de terrain comprend un corps de trépan formé d~un matériau composite à matrice de particules contenant une pluralité de particules dures dispersées dans un matériau à matrice. Une tige est fixée au corps de trépan à l~aide d~un élément de retenue.
Eason Jimmy W.
Lyons Nicholas J.
Oxford James A.
Smith Redd H.
Stevens John H.
Baker Hughes Incorporated
Sim & Mcburney
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