Based on the first order velocity-stress scheme on staggered grids, a three dimensional (3-D) finite-difference time-domain (FDTD) is applied to numerical study the designing of isolator of Logging-While-Drilling (LWD) acoustic tool in cylindrical coordinates. Simulation results show that different periodic grooved isolators vary widely in delaying and attenuating the tool waves which propagate along the tool. A type of isolator with staggered grooves is proposed for better performance.
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