US 12,147,005 B2
Ultrasonic pulse-echo and caliper formation characterization
Hiroshi Hori, Clamart (FR); Kenji Endo, Kanagawa (JP); and Mika Uno, Kanagawa (JP)
Assigned to SCHLUMBERGER TECHNOLOGY CORPORATION, Sugar Land, TX (US)
Appl. No. 17/310,167
Filed by Schlumberger Technology Corporation, Sugar Land, TX (US)
PCT Filed Jan. 22, 2020, PCT No. PCT/US2020/014606
§ 371(c)(1), (2) Date Jul. 22, 2021,
PCT Pub. No. WO2020/154399, PCT Pub. Date Jul. 30, 2020.
Claims priority of provisional application 62/795,972, filed on Jan. 23, 2019.
Prior Publication US 2022/0120928 A1, Apr. 21, 2022
Int. Cl. G01V 1/50 (2006.01); E21B 47/002 (2012.01); E21B 47/0224 (2012.01); E21B 47/04 (2012.01); E21B 47/14 (2006.01); E21B 47/26 (2012.01); E21B 49/00 (2006.01); G01V 1/46 (2006.01)
CPC G01V 1/50 (2013.01) [E21B 47/0025 (2020.05); E21B 47/0224 (2020.05); E21B 47/04 (2013.01); E21B 47/14 (2013.01); E21B 47/26 (2020.05); E21B 49/00 (2013.01); G01V 1/46 (2013.01); E21B 2200/20 (2020.05); G01V 2210/1299 (2013.01); G01V 2210/1429 (2013.01); G01V 2210/324 (2013.01); G01V 2210/60 (2013.01); G01V 2210/74 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method comprising:
using a downhole tool, acquiring ultrasonic echo data of a borehole, wherein the ultrasonic echo data comprise time series echoes representative of material and borehole geometry responsive to reflection of ultrasonic energy that comprises a wide-band frequency range;
filtering the ultrasonic echo data using at least one selected filter of a plurality of filters for multi-band frequency filtering corresponding to different frequency ranges of the wide-band frequency range to generate filtered data, wherein each band of a plurality of bands of the wide-band frequency range includes a central frequency and a pass-band frequency and each filter of the plurality of filters includes a combination of one or more of low pass filter, high pass filter, and bandpass filters; and
processing the filtered data to generate attribute values representative of physical characteristics of the material, the borehole geometry, or the material and the borehole geometry wherein the attribute values include travel time at multiple frequencies proportional to a standoff distance between a transducer and a wall of the borehole and amplitude.