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The Xaminer Sonic is a new wireline acoustic logging tool that represents the culmination of 4 years of computer modeling, engineering, lab testing, field surveys, and data analysis from fast and slow formations. Spanning a total of 52 ft, the tool includes a 6-ft-long array of 13 rings of eight azimuthally separated receivers located every 6 in. along the axis. There are a total of 104 individual receivers, each a piezoelectric hydrophone with a precisely matched response from 300 to 25,000 Hz. Four monopole piezoelectric sources and two orthogonal dipole shaker sources are located at different offsets to and different sides of the receiver array, permitting an advanced, multi-scale, 3-D interrogation of the formation's elastic properties with a continuous depth of investigation. These sources transmit a modally pure, full spectrum of acoustic energy into the formation using minimum phase and chirp drive pulses. Substantial modeling and engineering efforts have produced a tool structure design that mitigates the effects of the tool and enables broadband measurement of formation compressional, Stoneley, and flexural wave dispersion. By virtue of this unique tool design, load-bearing axial stresses are automatically transferred from the weaker inner tube to the stronger outer structure when hostile logging loads are encountered, thereby reducing the risk of tool loss or damage. All recordings are saved in high fidelity to tool memory, permitting full decomposition and analysis in post processing. Examples of waveforms, dispersion curves, sonic logs, and anisotropy measurements are presented to demonstrate the quality of the acoustic recordings.

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