US 12,270,296 B2
Cement evaluation
Mark Collins, Houston, TX (US); Qingtao Sun, Spring, TX (US); and Amit Padhi, Houston, TX (US)
Assigned to HALLIBURTON ENERGY SERVICES, INC., Houston, TX (US)
Filed by Halliburton Energy Services, Inc., Houston, TX (US)
Filed on Aug. 3, 2023, as Appl. No. 18/229,941.
Prior Publication US 2025/0043679 A1, Feb. 6, 2025
Int. Cl. E21B 47/16 (2006.01); E21B 47/005 (2012.01); E21B 47/107 (2012.01); G01N 29/04 (2006.01)
CPC E21B 47/16 (2013.01) [E21B 47/005 (2020.05); E21B 47/107 (2020.05); G01N 29/041 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A system for evaluating well cementation, comprising:
a body configured to be lowered into a casing within a wellbore;
an emitter configured to emit an acoustic signal and coupled to the body at a pitch angle and frequency band selected to excite a mixed-mode Lamb wave comprising a symmetric extensional (Sn) mode and an asymmetric flexural (An) mode in the casing;
wherein the pitch angle is selected to primarily excite a single dominant S0 mode and a single dominant A0 mode of the Lamb wave in the casing; and
a first receiver coupled to the body at a first distance from the emitter and configured to receive a portion of the Lamb wave that has leaked from the casing at approximately the first distance and calculate a first moment (EM1) of an energy distribution between points n1 and n2 of the mixed mode (S0, A0) portion of the first waveform, given by the equation:

OG Complex Work Unit Math