US 12,078,058 B2
Near field ultrasonic logging
Kunal K. Tiwari, Fulshear, TX (US); Jess V. Ford, Conroe, TX (US); Brian A. Mohon, Spring, TX (US); and Mohand Arezki Belloul, Cypress, TX (US)
Assigned to Weatherford Technology Holdings, LLC, Houston, TX (US)
Filed by Weatherford Technology Holdings, LLC, Houston, TX (US)
Filed on Apr. 20, 2022, as Appl. No. 17/659,982.
Prior Publication US 2023/0340873 A1, Oct. 26, 2023
Int. Cl. E21B 47/16 (2006.01); G01B 17/02 (2006.01); G01N 29/04 (2006.01); G01N 29/11 (2006.01); G01V 1/00 (2024.01); G01V 1/44 (2006.01); G01V 1/52 (2006.01)
CPC E21B 47/16 (2013.01) [G01B 17/02 (2013.01); G01N 29/045 (2013.01); G01N 29/11 (2013.01); G01V 1/001 (2013.01); G01V 1/44 (2013.01); G01V 1/52 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A method of logging a wellbore containing a fluid and having a casing, the method comprising:
providing an acoustic logging tool and a plurality of transducer heads, wherein:
the acoustic logging tool is configured to use any of the transducer heads for acoustic logging,
each of the transducer heads are configurable to use at least one transducer crystal,
each of the transducer heads is configured to provide a different standoff distance between the transducer crystal and the casing when the acoustic logging tool is run into the wellbore,
using one or more properties of the fluid to determine whether or not to use a standoff distance that is less than a far-field distance (N) from the casing for logging the wellbore,
if it is determined to use a standoff distance that is less than (N), selecting a transducer head to provide a standoff distance that is less than (N),
else, selecting a transducer head to provide a standoff distance that is equal to, or greater than (N),
configuring the acoustic logging tool with the selected transducer head, and
logging the wellbore with the acoustic logging tool.