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.
Claims9
An ultrasonic logging tool comprising:
- an acoustic transducer that transmits a programmable waveform pulse and receives an acoustic response, the programmable waveform pulse comprising a wavelet having a characteristic frequency that is a non-unitary integer multiple of a fundamental reverberation frequency of a casing having a thickness;
- and
- a processor coupled to the acoustic transducer to capture the acoustic response and to determine an inter-peak time and an amplitude of a second peak in the acoustic response,
- wherein the processor further determines an impedance value from the amplitude, and
- wherein the processor still further determines the casing thickness from the inter-peak time.
An acoustic logging system comprising:
- an acoustic logging tool having an acoustic transducer that transmits acoustic pulses and digitizes acoustic responses;
- and
- a surface facility that receives representations of the acoustic responses and determines acoustic impedance measurements of material around a casing when the acoustic pulses comprising wavelets having a characteristic frequency that is some non-unitary integer multiple of a fundamental reverberation frequency of a casing wall, wherein the characteristic frequency is determined from a thickness of the casing wall, and wherein the thickness is determined from an inter-peak time of the acoustic responses.
Dependencies are inferred from the claim text.