US 11,947,064 B2
Automatic recognition of environmental parameters with azimuthally distributed transducers
Mikhail Lemarenko, Beijing (CN); Roel Van Os, Clamart (FR); Orland Guedes, Clamart (FR); Thilo Michael Brill, Clamart (FR); and Hiroshi Hori, Clamart (FR)
Assigned to SCHLUMBERGER TECHNOLOGY CORPORATION, Sugar Land, TX (US)
Filed by Schlumberger Technology Corporation, Sugar Land, TX (US)
Filed on Nov. 5, 2021, as Appl. No. 17/520,016.
Claims priority of application No. 20306347 (EP), filed on Nov. 6, 2020.
Prior Publication US 2022/0146702 A1, May 12, 2022
Int. Cl. G01V 1/52 (2006.01); G01V 1/30 (2006.01)
CPC G01V 1/52 (2013.01) [G01V 1/303 (2013.01); G01V 2001/526 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A method comprising:
disposing a toolstring in a cased portion of a borehole penetrating a subsurface formation, wherein the cased borehole portion comprises a metal casing, and wherein the toolstring comprises a module comprising a plurality of acoustic transducers distributed azimuthally around the toolstring and each operable to emit and receive acoustic signals;
operating the module to:
emit an acoustic signal, from at least one of the transducers, into fluid surrounding the module in the casing; and
record data indicative of receipt, by a plurality of the transducers, of acoustic waveforms resulting from interaction of the emitted acoustic signal with the casing, including at least a non-specular diffraction head wave excited by a guided wave that is excited by diffraction of the acoustic signal propagating in the casing metal; and
determining acoustic velocity of the guided wave in the casing metal (Vguided) utilizing the recorded data and geometric parameters of the module.