Liquid level detection

Measuring and testing – Borehole or drilling – Downhole test

Patent

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Details

73302, 166252, 340618, E21B 4704

Patent

active

049727052

ABSTRACT:
A method for detecting the presence of a liquid level at a monitor point along the depth of a borehole utilizes a diaphragm pressure switch for sensing the pressure of a captive air column in a measurement tube extending from the pressure switch to a predetermined point below the monitor point. In use a rising liquid level in the borehole seals an open lower end of the measurement tube from the earth atmosphere and allows the rising liquid level to compress the captive air column. In a preferred embodiment a visual signal is activated by the pressure switch when the liquid level in the borehole reaches the monitor point.

REFERENCES:
patent: 3938549 (1976-02-01), Nunneley
patent: 3969942 (1976-07-01), Hope et al.
patent: 4523465 (1985-06-01), Fasching et al.
patent: 4570718 (1986-02-01), Adams, Jr.
patent: 4747451 (1988-05-01), Adams, Jr. et al.
Liptak, B. G. "Inst. Engr. Hdbook-Process Measurment" 1982 p. 199, Chilton Book Co.
Phillips Pet. Co., ltr. to EPA of Oct. 2, 1987, Attachment V, "Device for Accomplishing Fluid Level Monitoring".

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