Measuring and testing – Volume or rate of flow – By measuring vibrations or acoustic energy
Patent
1983-06-30
1985-08-06
Ruehl, Charles A.
Measuring and testing
Volume or rate of flow
By measuring vibrations or acoustic energy
73155, 7386104, G01F 166, E21B 4700
Patent
active
045328129
ABSTRACT:
Method and apparatus for measuring the flow velocity of drilling mud returning from the annulus of a borehole. At least two parametric acoustic pulse transducers are longitudinally disposed with respect to a conduit with a pair of acoustic receivers positioned therebetween. The transducers each generate strong, focused acoustic waves comprised of combined dual frequencies directed at the center of the conduit area in which fluid flow is to be measured. The transducers are actuated alternately and produce time variant signals permitting measurement of fluid flow by employing the Doppler effect on the parametric secondary acoustic pulses. The utilization of combined dual frequency acoustic transducers provides a primary signal having sufficient strength to produce a non-linear response in the liquid and produce secondary, low frequency wave propagation directly from within the mud itself. The low frequency waves enhance wave propagation through gas cut muds and enhance signal recognition in the receivers. In this manner, mud flow rate data can be accurately generated in either a downhole or wellhead configuration directly through mud laden with gas and without significant signal loss or conventional axial range limitations.
REFERENCES:
patent: 2290408 (1942-07-01), Crites
patent: 4003252 (1977-01-01), Dewath
patent: 4004461 (1977-01-01), Lynnworth
patent: 4052896 (1977-10-01), Lee et al.
patent: 4208906 (1980-06-01), Roberts, Jr.
Johnson, Jr. William E.
McClenny Carl O.
NL Industries Inc.
Ruehl Charles A.
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