Hydraulic lockout device for pressure controlled well tools

Details Hydraulic lockout device for pressure controlled well tools Hydraulic lockout device for pressure controlled well tools

2011-04-19

2011-04-19

Neuder, William P (Department: 3672)

Wells

Processes

Operating valve, closure, or changeable restrictor in a well

C166S386000, C166S324000

Reexamination Certificate

active

07926575

ABSTRACT:
Well tools are provided which although pressure responsive, may be maintained by a hydraulic lockout in a nonresponsive condition until a threshold actuation step is performed. This lockout may be achieved by a hydraulic mechanism which controls the rate at which pressure is transmitted to a fluid spring during periods of increased pressure at the pressure source. When the tool is desired to be responsive to pressure cycles, a valve may be opened by established a differential between the pressure in the fluid spring and the pressure source. Communication of pressure in the fluid spring to a movable mandrel will then allow operation of the well tool in response to pressure cycles at the pressure source in accordance with the established design of the well tool.

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