Pipe joints or couplings – Frangible element
Patent
1980-11-24
1982-12-21
Arola, Dave W.
Pipe joints or couplings
Frangible element
285 18, 285 39, 285 35, 285 85, 285 93, 285332, 285334, 285DIG21, 285DIG23, 166 65R, 166250, 166377, F16L 3708
Patent
active
043645879
ABSTRACT:
For use in a drilling string including drill collars, a safety joint which enables the string of drill pipe to be unthreaded from the drill collars at the safety joint is disclosed. A safety joint utilizes a collet telescoped within and threaded to an outer tubular member connected in the drill string. They are held together by a releasable lock pin which is inserted and retracted to thereby enable the drill string to be separated at the safety joint so that remedial steps can be taken to free the remainder of the drill string. The safety joint is also capable of being actuated mechanically under control from the surface.
Particular valve and signal receivers are disclosed herein including frequency responsive structural components which vibrate on being inflicted with a particular ultrasonic signal. The vibratory components oscillate and thereby initiate leakage of hydraulic oil from a pin locking system. Several alternate forms are disclosed.
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