Drill pipe breakout device

Details Drill pipe breakout device Drill pipe breakout device

1992-10-29

1993-12-07

Bui, Thuy M.

Boring or penetrating the earth

Processes

175320, E21B 2300

Patent

active

052676218

ABSTRACT:
A drill unit (12) is disclosed which uses slides (18, 20) mounted on the saver-sub (16) of the drill unit to lock the drill pipe (14) to the saver-sub (16) for joint rotation. Dogs (32) are engaged with flats (50) on the drill pipe by moving an outer collar (42) over the end of the drill pipe. The outer collar holds the dogs within the flats to ensure joint rotation between the saver-sub and the drill pipe. The outer collar (42) can be retracted away from the drill pipe to move the dogs out of engagement with the flats and move the slides (18, 20) to the retracted position.

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patent: 5050691 (1991-09-01), Moses

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