Safety valve

Details Safety valve Safety valve

1986-01-31

1987-05-12

Leppink, James A.

Wells

Valves, closures or changeable restrictors

Fluid operated

137494, 166324, E21B 3408, E21B 3410

Patent

active

046641955

ABSTRACT:
A direct acting subsurface safety valve. During normal well flowing conditions, an operator sleeve is spring biased to hold the valve closure mechanism in its open position. If the rate of change of fluid pressure flowing through the valve exceeds a preselected value, a pressure sensitive piston will shift the operator sleeve 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.

REFERENCES:
patent: 3794112 (1974-02-01), Hill
patent: 3814181 (1974-06-01), Young
patent: 4062406 (1977-12-01), Akkeman et al.
patent: 4140153 (1979-02-01), Deaton
patent: 4339001 (1982-07-01), Paschel, Jr.
patent: 4362214 (1982-12-01), Pringle et al.
patent: 4550780 (1985-11-01), Mott
patent: 4566478 (1986-01-01), Deaton

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