Method and apparatus for acoustic measurement of mud flow downho

Details Method and apparatus for acoustic measurement of mud flow downho Method and apparatus for acoustic measurement of mud flow downho

1990-07-17

1990-12-18

Smith, Jerry

Boots, shoes, and leggings

367 83, 175 48, G01V 140

Patent

active

049791125

ABSTRACT:
The flow rate of the drilling mud within a drill string is measured by measuring the doppler frequency shift in an acoustic signal propagated from a first acoustic transducer to a second acoustic transducer laterally separated from the first acoustic transducer. Each of the transducers are disposed within the principal flow of the drilling mud. The degree of doppler shift is a measure of the flow rate of the drilling mud between the two transducers. Variations in the flow rate of the drilling mud as measured by the transducers downhole are used to transmit information or commands from the well surface to a downhole microprocessor coupled to the output of the transducers.

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U.S.S.R. Inventor's Certificate, Specification No. 504163, Apr. 20, 1976 Ramsey et al., U.S. Statutory Invention Registration, No. H55, May 6, 1986.

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