Pressure controlled reversing valve

Details Pressure controlled reversing valve Pressure controlled reversing valve

1981-04-13

1983-09-13

Pate, III, William F.

Wells

Processes

Operating valve, closure, or changeable restrictor in a well

166321, 166331, E21B 3410

Patent

active

044036590

ABSTRACT:
In accordance with an illustrative embodiment of the present invention, a pressure controlled reversing valve for use in drill stem testing includes a housing having reversing ports that normally are closed by a valve sleeve that is mounted on a spring-loaded actuator mandrel, stop means for preventing opening movement of said actuator mandrel, a mechanical counter for disabling said stop means and enabling such opening movement only after a predetermined minimum number of pressure increases have been applied to the fluids standing in the pipe string in which the reversing valve is connected, and means responsive to a subsequent pressure increase for reclosing the valve sleeve and reactivating the stop means.

REFERENCES:
patent: Re26638 (1978-05-01), Nutter
patent: 2518795 (1950-08-01), Knox
patent: 3986554 (1976-10-01), Nutter
patent: 4113012 (1978-09-01), Evans et al.

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