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US 2018/0003844 A1Published application
Acoustic Tool Eccentering Correction
AssigneeSchlumberger Technology Corporation
InventorsNaoki Sakiyama, Wataru Izuhara
Life of this patent
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Abstract
An acoustic signal is transmitted from a downhole tool positioned within a wellbore. Amplitudes and travel times of the acoustic signal received at different azimuthal locations of the downhole tool are measured. Correction factors, each corresponding to a different one of the measured amplitudes, are determined based on the travel times measured at each of the different azimuthal locations. Corrected amplitudes are each determined based on the corresponding measured amplitude and the corresponding correction factor.
Claims20
A method comprising:
- transmitting an acoustic signal from a downhole tool positioned within a wellbore;
- measuring amplitudes and travel times of the acoustic signal received at different azimuthal locations of the downhole tool;
- determining correction factors, each corresponding to a different one of the measured amplitudes, based on the travel times measured at each of the different azimuthal locations;
- and
- determining corrected amplitudes each based on the corresponding measured amplitude and the corresponding correction factor.
2 more elements
A method comprising:
- conveying a downhole tool within a wellbore, wherein the downhole tool comprises a transmitter and a plurality of receivers, and wherein the receivers are disposed at different relative azimuthal positions;
- operating the downhole tool to:
- transmit an acoustic signal from the transmitter;
- and
- obtain measured amplitudes and arrival times of the acoustic signal at each of the receivers;
- and
- adjusting the measured amplitudes based on the measured arrival times.
4 more elements
A system comprising:
- a downhole tool for operation within a wellbore, wherein the downhole tool is operable to transmit an acoustic signal and measure amplitudes and arrival times of the acoustic signal at different azimuthal locations;
- and
- surface equipment disposed at a wellsite surface from which the wellbore extends, wherein one or both of the downhole tool and/or the surface equipment are individually and/or cooperatively operable to adjust each measured amplitude based on the measured arrival times, collectively, to compensate for error in each measured amplitude resulting from eccentering of the downhole tool within the wellbore.
Dependencies are inferred from the claim text.