Wells – Valves – closures or changeable restrictors – Longitudinally movable operator
Patent
1981-07-13
1983-12-20
Pate, III, William F.
Wells
Valves, closures or changeable restrictors
Longitudinally movable operator
166250, E21B 3408
Patent
active
044211724
ABSTRACT:
A spherical valve member type having a drill pipe tester valve and a moving apparatus to provide for moving the spherical valve member axially relative to the housing between its said open and closed positions, thereby permitting downward forces exerted upon the spherical valve member in its said closed position due to fluid pressure in the well test string above the spherical valve member, to be transmitted substantially entirely to the housing through the engagement of the downward facing surface of the lower valve seat structure and the upward facing surface of the housing. A latch device is provided for latching the spherical valve member in its closed position as the well test string is lowered into the well and for subsequently releasing the spherical valve member and allowing it to move to its open position when the well test string is finally positioned within the well. A resilient means is provided to prevent movement of the spherical valve member to its open position until a predetermined force is applied to the tester valve. Upon picking up the well test string the latching device provides a safety valve feature by moving the spherical valve member back to its closed position.
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Duzan James R.
Halliburton Company
Pate III William F.
Weaver Thomas R.
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