Break-out joint with selective disabler

Details Break-out joint with selective disabler Break-out joint with selective disabler

1988-05-12

1989-05-16

Novosad, Stephen J.

Boring or penetrating the earth

Processes

175320, 166 775, 403320, 285 81, 285 89, E21B 17043, E21B 1916

Patent

active

048301213

ABSTRACT:
A device for reducing the break-out torque in a drill pipe tool joint selectively can be disabled so that break-out is at standard torque. The torque reducing device includes a collar located on the pin. The collar has a makeup shoulder that makes up against the makeup shoulder of the box of the drill pipe. The collar has a pair of ramp rings that will slide relative to each other during break-out torque. When they slide, they reduce the overall vertical height, allowing the collar to move vertically from the makeup shoulder a slight distance to reduce the torque. A split ring encircles the ramp rings for urging the ramp rings back to the initial position. A pin engages a slot in the split ring. The pin can be rotated between locked and unlocked positions to prevent the split ring from expanding. This prevents the ramp rings from operating.

REFERENCES:
patent: 2708132 (1955-05-01), O'Neill
patent: 3608933 (1971-09-01), Lee
patent: 3915244 (1975-10-01), Brown
patent: 4252458 (1981-02-01), Keen
patent: 4534585 (1985-08-01), Saliger
patent: 4606557 (1986-08-01), Coffey
patent: 4658915 (1987-04-01), Goris et al.

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