Level sensor
USRE33690E · kind E · reissue
31Cited by
10References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 5, 1990 |
| Grant date | Sep 17, 1991 |
| Priority date | — |
| Expiry date | Apr 5, 2010 |
Classification
- Technology area (CPC —)General
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.