A drillpipe sub

Details A drillpipe sub A drillpipe sub

E - Fixed Constructions

21

B

E21B 17/20 (2006.01) E21B 23/10 (2006.01) E21B 33/12 (2006.01)

Patent

CA 2394247

A drillpipe sub (30) comprises a shaft (32), a first frustoconical member (34) encircling, and fixedly mounted on, the shaft (32), and a second, opposed frustoconical member (36) encircling, and slidably mounted on, the shaft (32). The first frustoconical member (34) is bonded at its base (38) to the base (40) of the second frustoconical member (36).

L'invention concerne une réduction de tige de forage (30) qui comprend une manche (32), un organe tronconique (34) encerclant la manche (32) et fixé solidement à celle-ci, et un deuxième organe tronconique (36) opposé encerclant la manche (32) et fixé solidement à celle-ci. La base (38) du premier organe tronconique (34) est liée à la base (40) du deuxième organe tronconique (36).

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