Drill string make-up and break-out mechanism

Details Drill string make-up and break-out mechanism Drill string make-up and break-out mechanism

1976-09-22

1977-06-21

Leppink, James A.

Wells

Above ground apparatus

With means facilitating connecting or disconnecting...

24249DP, 81 5735, 173164, 175320, E21B 3303, B25B 1350

Patent

active

040305422

ABSTRACT:
The drill pipe has a longitudinal section of smaller diameter and a pair of circumferentially separated grooves provided in an annular shoulder adjacent the smaller diameter portion of the pipe. Pipe-holding members to which a pawl is connected are circumferentially spaced adjacent the drill pipe. The pipe-holding members and pawls are simultaneously actuated so that the holding members fit around the smaller diameter portion of the pipe to support the pipe, and the pawls fit into the grooves in the pipe to permit either the breaking out of the pipe string or the making up of the pipe string, depending on which pawl is fitted into the groove.

REFERENCES:
patent: 3239016 (1966-03-01), Alexander
patent: 3302735 (1967-02-01), Klein et al.
patent: 3463247 (1969-08-01), Klein
patent: 3768579 (1973-10-01), Klein

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