APC OFS’s High Definition Sonic Logging Tool (HDSL) is part of the Gallop Suite and it is comprised of a single transmitter and five receivers. The instrument provides a borehole compensated acoustic compressional travel time (Dt). Applications include porosity calculations, and calibration of seismic data. It can also be used for cement bond evaluation.

The sonic logging tools integrated DTC travel time is used to improve seismic time-depth correlation and it serves as an important input to geomechanics evaluations.