Electromagnetic flowmeter for conductive or dielectric fluids and its applications in particular oilfield
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United States of America Patent
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May 1, 1990
Grant Date -
N/A
app pub date -
Nov 19, 1987
filing date -
Nov 25, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention is a non-intrusive system for measuring the flow rates of insulating or conducting fluids in conduits. It results from the combination of an electromagnetic flowmeter, operating with conducting fluids, and of a triboelectric noise cross-correlation flowmeter, operating with insulating fluids. The system is equipped with a non-intrusive device for measuring fluid conductivity. The electronic signal processing unit uses the conductivity value to decide which of the two sensors is providing a signal effectively representing the fluid flow rate. The electromagnetic flowmeter may use electrodes of small cross-section in contact with the fluid or, more advantageously, it may be of the capacitive type using larger section electrodes isolated from the fluid.
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