US 11,656,381 B2
Extracting shear wave slowness from hexapole waves and octupole waves
Ruijia Wang, Singapore (SG); Brenda Sue Jonathan, Bangkok (TH); and Richard Timothy Coates, Katy, TX (US)
Assigned to Halliburton Energy Services, Inc., Houston, TX (US)
Filed by Halliburton Energy Services, Inc., Houston, TX (US)
Filed on Apr. 2, 2020, as Appl. No. 16/838,427.
Prior Publication US 2021/0311222 A1, Oct. 7, 2021
Int. Cl. G01V 1/50 (2006.01)
CPC G01V 1/50 (2013.01) [G01V 2200/16 (2013.01); G01V 2210/6222 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A system for calculating a formation shear-wave slowness comprising:
a borehole sonic logging tool comprising:
a transmitter comprising one or more elements disposed on the borehole sonic logging tool, wherein the transmitter is configured to transmit a first mode into a borehole; and
one or more receivers disposed on the borehole sonic logging tool, wherein the one or more receivers are configured to detect a second mode that one or more lobes than is a higher order than the first mode; and
an information handling system configured to apply a multimode frequency semblance to the second mode to form a dispersion log and calculate the formation shear-wave slowness from the second mode based at least in part on the dispersion log.