Locke Lord LLP
Acoustic dipole piston transmitter
According to embodiments of the disclosure, a downhole tool for taking acoustic measurements in a wellbore is provided. The tool may have an acoustic dipole transmitter with a piston made from a soft magnetic material, mounted on a centering spring between the first coil and the second coil, which moves the piston bi-directionally along a longitudinal axis when energized. The tool may also have a feedback winding on at least one of the first or second coils. The tool may also have a circuit for energizing the first and second coils which includes an input for receiving a signal responsive to the position of the piston relative to the coils and a processor for determining an output waveform used to generate an acoustic signal.
Halliburton Energy Services, Inc.
G E G E E E E G
G01V E21B G01V E21B E21B E21B E21B G01V
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Chung Michael Gary L. Gary Laurence T.
Chang Simmons Fickert Kainer Wisniewski