Wells – Above ground apparatus – Well caps or casing heads
Patent
1976-03-18
1977-07-05
Novosad, Stephen J.
Wells
Above ground apparatus
Well caps or casing heads
166 72, 137268, E21B 2300, E21B 4312
Patent
active
040334082
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 in 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: 3011196 (1961-12-01), Glover
patent: 3028996 (1962-04-01), Ellett
patent: 3403729 (1968-10-01), Hickey
patent: 3457932 (1969-07-01), Wakefield, Jr.
patent: 3541837 (1970-11-01), Davis et al.
patent: 3848621 (1974-11-01), Dickenson
patent: 3889708 (1975-06-01), Chronister et al.
Fredd John V.
Hill William G.
Continental Oil Company
Garland H. Mathews
Novosad Stephen J.
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