Active Damping of Acoustic Ringing Effect for Oil Well Sonic Logging System
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© 2017 IEEE. This paper presents a method to suppress the ringing effect for an acoustic transmitter used in oilfield wireline logging. The removal of ringing is desirable for acoustic logging as too much ringing can interfere with the processing of formation data. The existing approach uses a strong passive damper to damp out the vibration energy. This, however, limits the magnitude of the acoustic signal generated for logging purposes and can also create reliability challenges. This paper proposes a new method based on the active ringing damping in which a control signal is injected to compensate the transmitter motion vibration and is adapted under the change of operating environments. As compared to approaches developed for other acoustic applications, the method does not require the addition of extra sensors to the existing system and is designed to comply with the unique downhole logging hardware constraints. An iterative technique is used to adapt the ringing braking signal by learning the control patterns in the past cycles. Both simulation and experimental results are presented to demonstrate the effectiveness and robustness of the proposed method in the ringing braking.
author list (cited authors)
Song, X., Zhao, Y., & Dykstra, J.