Oil well testing safety valve

Details Oil well testing safety valve Oil well testing safety valve

1977-06-30

1978-09-12

Leppink, James A.

Wells

Valves, closures or changeable restrictors

Longitudinally movable operator

251 54, E21B 4700

Patent

active

041130189

ABSTRACT:
A valve for use in conjunction with a testing string in an oil well is disclosed in which the valve is maintained in the open position until the valve is placed in sufficient compression to collapse any slip joint which also appears in the testing string. A pressure piston is present in the valve having one surface exposed to the well annulus and a second surface exposed to a pressure in a flow passage through the testing string. The valve includes a rotatable ball valve and a bypass around the ball for equalizing the pressure above the ball with the pressure below the ball for use in opening the valve from the closed position. A spring means in the valve biases the closed ball toward the open position for opening the ball when a pressure difference across the ball is reduced sufficiently to allow the ball to rotate to the open position.

REFERENCES:
patent: 3351133 (1967-11-01), Clark, Jr. et al.
patent: 3354950 (1967-11-01), Hyde
patent: 3435897 (1969-04-01), Barrington
patent: 3646995 (1972-03-01), Manes et al.
patent: 3741305 (1973-06-01), Young et al.
patent: 3814182 (1974-06-01), Glroux
patent: 3848669 (1974-11-01), Brown
patent: 4047564 (1977-09-01), Nix et al.
patent: 4050512 (1977-09-01), Giebeler

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