Wells – With below and above ground modification – Above ground actuating means for below ground device
Patent
1974-10-21
1976-05-11
Novosad, Stephen J.
Wells
With below and above ground modification
Above ground actuating means for below ground device
166224A, 166239, 166 75R, E21B 4312
Patent
active
039556247
ABSTRACT:
Well tools comprising a go-devil actuated well safety valve, a locking assembly for releasably locking the safety valve at a desired depth in a well, running and pulling tools for installing and removing the safety valve, a go-devil ball for closing the safety valve, and apparatus for dropping the go-devil ball into a well under pressure and for retrieving the ball. The go-devil safety valve is mounted above the locking assembly and includes a trigger type latch which is released from above by the impact of the go-devil ball. The valve may be reset for reopening the valve without removal of the valve from the well bore by means of a special reset and pulling tool disclosed herein. The go-devil valve is installed in a well, preferably above a storm choke, to shut the well in under emergency conditions which releases the go-devil ball at the surface in response to hazardous conditions such as fire. The go-devil ball drops to the go-devil valve which closes in response to the impact of the ball.
REFERENCES:
patent: 2976928 (1961-03-01), Gilbert
patent: 2998077 (1961-08-01), Keithahn
patent: 3028996 (1962-04-01), Ellett
patent: 3275080 (1966-09-01), Nelson et al.
patent: 3763933 (1973-10-01), Mott
patent: 3786865 (1974-01-01), Tausch
Fredd John V.
Hill William G.
Kearney Benjamin E.
Tynan, deceased John W.
Continental Oil Company
Garland H. Mathews
Novosad Stephen J.
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