Ultrasonic imaging in wells or tubulars
AssigneeHalliburton Energy Services, Inc.
InventorsBatakrishna Mandal, Clovis S. Bonavides
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Abstract
An ultrasonic imaging method is provided. A wideband acoustic pulse is fired at a wall. A wideband response signal is received. The wideband response signal is processed to select an impedance measurement frequency. A wavelet having a characteristic frequency approximately equal to the impedance measurement frequency is fired. A wavelet response signal is received. A reflection coefficient is determined from the wavelet response signal. An impedance measurement is calculated from the reflection coefficient. Related tools and systems are also disclosed.
Claims10
An ultrasonic imaging method that comprises:
- firing a wideband acoustic pulse at a wall;
- receiving a wideband acoustic response signal;
- processing the wideband acoustic response signal to select an impedance measurement frequency;
- firing a wavelet having a characteristic frequency approximately equal to the impedance measurement frequency;
- receiving a wavelet response signal;
- determining a reflection coefficient from the wavelet response signal by:
- convolving a model wavelet with a model response to obtain a model receive signal;
- comparing the model receive signal to the received wavelet response signal;
- adjusting at least one parameter of the model response to reduce a difference between the model receive signal and the wavelet response signal;
- and
- calculating an impedance measurement from the reflection coefficient.
Dependencies are inferred from the claim text.