Fluid pressure actuated bypass and pressure indicating relief va

Details Fluid pressure actuated bypass and pressure indicating relief va Fluid pressure actuated bypass and pressure indicating relief va

1987-10-01

1988-09-06

Novosad, Stephen J.

Boring or penetrating the earth

Automatic control

Of boring means including a below-ground drive prime mover

175 48, 175107, E21B 402, E21B 2108, E21B 2110

Patent

active

047685980

ABSTRACT:
A control apparatus preferably for concurrently protecting a downhole fluid pressure operated device from excessive fluid pressures and indicating at the surface when any such excessive fluid pressure level has been reached. The pressured fluid is directed through a bore of a sleeve, and a flow plug is normally located in an axially remote position relative to the sleeve bore. The flow plug is moved upon the occurrence of a predetermined fluid pressure across the downhole device to move into the bore of the sleeve and produce a flow constriction which will result in an detectable fluid pressure signal at the surface. Concurrently, a bypass flow path is established around the fluid pressure operated device to immediately reduce the fluid pressure being applied to such device.

REFERENCES:
patent: 2865602 (1958-12-01), Whittle
patent: 2879032 (1959-03-01), Whittle
patent: 2963099 (1960-12-01), Gianelloni, Jr.
patent: 3802515 (1974-04-01), Flamand et al.
patent: 3840080 (1974-10-01), Berryman
patent: 4275795 (1981-06-01), Beimgraben et al.
patent: 4280524 (1981-07-01), Beimgraben
patent: 4546836 (1985-10-01), Dennis et al.

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