Method and apparatus for determining the flow characteristics of a fluid in a well
US4433573A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 23, 1982 |
| Grant date | Feb 28, 1984 |
| Priority date | — |
| Expiry date | Jun 23, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F1/3259
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The method according to the present invention for determining the flowrate of a fluid flowing in a well comprises the steps of lowering in the well a logging sonde comprising at least one vortex street generating obstacle and a transducer responsive to pressure variations due to the generation of vortices, the transducer producing, for each depth in the well, a detection signal the useful component of which has a frequency f and an amplitude A, deriving from the detection signal a first signal indicative of frequency f, deriving from the detection signal a second signal indicative of the reduced amplitude Ar, defined as the ratio A/f.sup.2, and forming from the first and second signals an indication of the flowrate in accordance with a first predetermined relationship expressing the frequency f as a function of the flowrate and of the bubble rate of the fluid at the respective depth, the first relationship including a linear dependency of the frequency f upon the flowrate, and a second predetermined relationship expressing the reduced amplitude Ar as a function of the bubble rate and of the flowrate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.