Subsurface differential pressure recorder

Details Subsurface differential pressure recorder Subsurface differential pressure recorder

1975-08-08

1976-12-21

Myracle, Jerry W.

Measuring and testing

Borehole or drilling

Downhole test

E21B 4706

Patent

active

039980960

ABSTRACT:
The invention involves a device for recording pressure variations which are small with respect to the absolute pressure value in a bore hole which produces fluids under pressure from a hydrocarbon formation, based on measured differential pressure. The device uses a helical spring for the pressure sensing element and a piston rotated by a clock through the medium of a fork and two rollers provided on the stylus which is integral with the piston. The pressure difference arising between a recording chamber and the helical spring chamber causes the piston to move axially. The device is characterized by having a valve providing pressure equalization between the recording chamber and the bore hole, the opening of said valve being controlled by a clock which rotates a rod upon which a member is threadedly fitted so as to hold the valve open for a predetermined time.

REFERENCES:
patent: 2816440 (1957-12-01), Garrison
patent: 2942462 (1960-06-01), Buck
patent: 3318145 (1967-05-01), Lynn et al.

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