专利名称：Level sensor
发明人：Harold P. Adams, Jr.,Andrew B.
Maitland,David R. Hill,William E. Banton,LeeM. Richey,David C. Taylor
申请号：US07/505346申请日：19900405公开号：USRE033690E1公开日：19910917
摘要：A system for controlling production in an oil well comprises a first level sensormounted upon the outer surface of the tubing near the lower end of the tubing and asecond level sensor mounted upon the outer surface of the tubing above the first levelsensor. The first level sensor is tuned to a first electrical signal frequency. The secondlevel sensor is tuned to a second electrical signal frequency. A control device at spacedintervals transmits electrical signals of the first and second frequencies down the oil welland senses the liquid level by detecting impedance.
代理机构：Webb, Burden, Ziesenheim & Webb
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