E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 17/00 (2006.01) E21B 17/042 (2006.01)
Patent
CA 2221018
A drill rod for a drill string has a thread at each end and is connected to an adjacent rod by a sleeve. The threads on the sleeve and rod are configured to reduce stress concentrations and provide sacrificial wear on the sleeve. The thread has a single start with a part circular root and the wear volume on the sleeve is less than that on the rod. The outer diameter of the rod is at least twice that of the inner bore.
Tige de forage pour train de tiges qui comporte un filetage à chaque extrémité et qui est reliée à une tige voisine par un manchon. Les filetages du manchon et de la tige sont configurés de manière à diminuer la concentration des contraintes et à distribuer l'usure sacrificielle sur le manchon. Le filetage n'a qu'un seule entrée et un fond en partie circulaire; le volume d'usure du manchon est inférieur à celui de la tige. Le diamètre extérieur de la tige est au moins le double de celui de l'alésage intérieur.
Boart Longyear Canada
Boart Longyear Inc.
Smart & Biggar
LandOfFree
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