Remote hydraulic control of downhole tools
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United States of America Patent
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Sep 27, 2016
Grant Date -
Oct 15, 2015
app pub date -
Feb 26, 2013
filing date -
Feb 26, 2013
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A well tool apparatus comprises a control arrangement configured to control response of the downhole tool by varying a bore-annulus pressure difference. The control arrangement includes a valve piston longitudinally slidable in a generally tubular controller housing that is in operation substantially co-axial with the wellbore, to open or close a valve port to a fluid flow connection between the drill string's interior and the tool. A latch mechanism is configured to latch the valve piston against movement in one axial direction, keeping the valve piston in an open or a closed condition. Unlatching of the valve piston requires displacement thereof in the other axial direction to a mode change position. A stay member is automatically displaceable under hydraulic actuation responsive to bore-annulus pressure differences above a trigger threshold value, to obstruct movement of the latched valve piston under hydraulic actuation to the mode change position.
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Cited Art Landscape
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