Tubular element for use in a rotary drilling assembly and method

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

1990-12-05

1992-12-29

Novosad, Stephen J.

Boring or penetrating the earth

Processes

175 61, 175323, 1753251, 175430, 175431, E21B 704, E21B 1722

Patent

active

051743914

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 ratched 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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