Correcting Eccentering Effect in Pulse-Echo Imaging

A system comprising:

• a downhole tool comprising:
• an ultrasonic portion comprising:
• at least one transducer configured to emit a plurality of ultrasonic pulses toward a surface of a wellbore, including through drilling mud contained within the wellbore;
• and
• at least one detector configured to detect a plurality of ultrasonic pulse echoes corresponding to the plurality of ultrasonic pulses;
• and
• a processing device comprising a processor and a memory for storing an executable code, wherein the processing device is operable to:
• store and/or process data collected for a period of time by detecting the plurality of echoes from the plurality of ultrasonic pulses emitted by the downhole tool;
• extract select variable information related to the detected echoes, including at least echo envelope amplitude, azimuth, and location corresponding to each detected echo;
• assess, based on the extracted select variable information, echo envelope amplitude sensitivity to geometric and spatial characteristics of the downhole tool within the wellbore, wherein the geometric and spatial characteristics include at least a standoff between the transducer and the wellbore and an incident angle;
• correct the echo envelope amplitudes for eccentering effects based on the sensitivity assessment;
• and
• generate a visual representation of corrected echo envelope amplitudes.

A tangible, non-transient, computer-readable medium (TNTCRM) comprising instructions executable by a processor to:

• store and/or process data collected for a period of time by detecting a plurality of echoes from a plurality of ultrasonic pulses emitted by at least one transducer of a downhole tool toward a surface of a wellbore, including through drilling mud contained within the wellbore;
• extract select variable information related to the plurality of echoes, including at least envelope amplitude, azimuth, and location corresponding to each detected echo;
• utilize the extracted select variable information to assess echo envelope amplitude sensitivity to geometric and spatial characteristics of the downhole tool within the wellbore, wherein the geometric and spatial characteristics include at least a standoff between the transducer and the wellbore and an incident angle;
• correct echo envelope amplitudes for eccentering effects based on the sensitivity assessment;
• and
• generate a visual representation of corrected echo envelope amplitudes.