Tubular element for use in a rotary drilling assembly

Details Tubular element for use in a rotary drilling assembly Tubular element for use in a rotary drilling assembly

E - Fixed Constructions

21

B

255/24

E21B 7/04 (2006.01) E21B 7/06 (2006.01) E21B 17/10 (2006.01)

Patent

CA 1329193

A B S T R A C T TUBULAR ELEMENT FOR USE IN A ROTARY DRILLING ASSEMBLY A tubular drill string element, such as a stabilizer or tool joint, comprises an outer surface having in circumferential direction a ratchet profile. The ratchet profile is preferentially oriented such that it provides low resistance against right hand rotation but high resistance against left hand rotation of the drill string.

563863

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