Acoustic noise cancelling apparatus for well logging and method

Details Acoustic noise cancelling apparatus for well logging and method Acoustic noise cancelling apparatus for well logging and method

1996-08-23

1997-06-17

Eldred, J. Woodrow

Acoustics

Geophysical or subsurface exploration

Well logging

181108, 181112, 367 38, 7315247, 7315216, 175 40, 175 50, G01V 140

Patent

active

056399979

ABSTRACT:
Disclosed is a sonic well tool for performing acoustic investigations of subsurface geological formations penetrated by a borehole, and a method of logging formation data. The well tool generally includes a longitudinally extending body for positioning in said borehole. The tool also includes a transmitter supported by the body for transmitting acoustic energy, and at least two receivers. One of the receivers is positioned on the interior of the sonic tool to receive the acoustic signals that traverse the sonic well tool. The second receiver is positioned on the exterior of the sonic tool and receive sonic signals that traverse the sonic tool and those that traverse the formation. The apparatus further includes a processor for subtracting the well tool signal of the first receiver from the combined well tool and formation signal of the second receiver.

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Search Report for corresponding UK application.

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