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

1988-01-06

1989-08-08

Novosad, Stephen J.

Boring or penetrating the earth

Processes

Boring curved or redirected bores

175323, 175325, 175410, E21B 704, E21B 1722

Patent

active

048543993

ABSTRACT:
A tubular drill string element, such as a stabilizer or tool joint, comprises an outer surface having in circumferential direction a ratchetted profile. The ratchetted profile is preferably oriented such that provides low resistance against right hand rotation but high resistance against left hand rotation of the drill string.

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