Downhole doppler flowmeter
US4905203A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 30, 1988 |
| Grant date | Feb 27, 1990 |
| Priority date | — |
| Expiry date | Sep 30, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F1/66
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A well logging system which monitors the flow rate of a fluid flowing in a borehole traversing an earth formation includes a sonde. A transmitter located in the sonde transmits acoustical waves into the fluid at a predetermined frequency. A receiver also located in the sonde receives reflected acoustical waves. The receiver also provides a signal corresponding to the received reflected acoustical waves. The provided signal is processed for being sent uphole by way of a cable. Electronics at the surface include circuitry which derives the velocity of the fluid in accordance with the frequency of the processed signal and the predetermined frequency. The circuitry provides an output signal corresponding to the derived velocity of the fluid flowing the borehole.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.