Fluid handling – Line condition change responsive valves – Safety cut-off requiring reset
Patent
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.
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Felger Thomas R.
Nilson Robert G.
Otis Engineering Corporation
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