Safety valve

Details Safety valve Safety valve

1987-01-28

1987-11-24

Nilson, Robert G.

Fluid handling

Line condition change responsive valves

Safety cut-off requiring reset

137463, 166319, 251 68, E21B 3300

Patent

active

047081635

ABSTRACT:
A subsurface safety valve. During normal well flowing conditions, the valve is spring biased to its open position. If the difference in fluid pressure flowing through the valve as compared to fluid pressure exterior to the valve exceeds a preselected value, a pressure sensitive bellows will be actuated to close the valve. A latch mechanism is provided to prevent undesired closure of the safety valve by acceptable pressure transients resulting from normal changes in well operating conditions. An alternative embodiment of the valve responds to an electromagnetic signal from the well surface.

REFERENCES:
patent: 2806484 (1957-09-01), Schultz
patent: 3032111 (1962-05-01), Corley, Jr. et al.
patent: 3070119 (1962-12-01), Raulins
patent: 3126908 (1964-03-01), Dickens
patent: 3208531 (1965-09-01), Tamplen
patent: 3273588 (1966-09-01), Dollison
patent: 3665955 (1972-05-01), Conner, Sr.
patent: 3902523 (1975-09-01), Gaut
patent: 4161215 (1979-07-01), Bourne, Jr. et al.
patent: 4339001 (1982-07-01), Paschal, Jr.
patent: 4617960 (1986-10-01), More

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