Wells – Processes – Operating valve – closure – or changeable restrictor in a well
Patent
1989-07-06
1990-12-25
Novosad, Stephen J.
Wells
Processes
Operating valve, closure, or changeable restrictor in a well
137 70, 166317, 166332, 166264, 251 62, E21B 3410, E21B 4312, E21B 4908
Patent
active
049795694
ABSTRACT:
A valve in a tool may be opened and closed by sequential application of a first predetermined annulus pressure and a second predetermined annulus pressure. A first rupture disc ruptures when the first predetermined annulus pressure is applied to the well annulus thereby allowing such pressure to be applied against a surface of an operator and moving the mandrel. This moves a yoke connected to the valve, opening the valve. A second rupture disc ruptures when the second predetermined annulus pressure is applied to the well annulus thereby allowing such pressure to be applied against a surface of a collet mandrel, moving the collet mandrel in a direction opposite to the direction in which the operator mandrel originally moved. Since the collet mandrel is connected to the operator mandrel and to the yoke, movement of the collet mandrel in the opposite direction moves the operator mandrel and the yoke in the opposite direction, thereby closing the valve. Since the two rupture discs are designed to rupture in response to two different pressures, the sequential application of the first and second predetermined pressures to the well annulus sequentially opens and closes the valve.
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Anyan Steven L.
Kennemer Vaughn D.
Lewis Richard G.
Bouchard John H.
Garrana Henry N.
Novosad Stephen J.
Schlumberger Technology Corporation
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