Level sensor
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United States of America
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Sep 17, 1991
Grant Date -
N/A
app pub date -
Apr 5, 1990
filing date -
Aug 6, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A system for controlling production in an oil well comprises a first level sensor mounted upon the outer surface of the tubing near the lower end of the tubing and a second level sensor mounted upon the outer surface of the tubing above the first level sensor. The first level sensor is tuned to a first electrical signal frequency. The second level sensor is tuned to a second electrical signal frequency. A control device at spaced intervals transmits electrical signals of the first and second frequencies down the oil well and senses the liquid level by detecting impedance.
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