X-Dipole Logging Tool (XDLT)

GOWell’s X-Dipole Logging Tool is an array acoustic tool with monopole, dipole and cross-dipole acquisition capabilities. The tool is essential for collecting a full range of acoustic datasets, which contribute to petrophysical evaluation and geophysical applications.

The X-Dipole Sonic Tool is composed of four (4) main parts:

1) Electronics instrument

2) Receiver section

3) Acoustic isolator

4) Transmitter section

The tool has four (4) separate broadband acoustic transmitters—one monopole, two dipole and one stoneley transmitter. The monopole output is optimized for compressional and refracted shear measurements; whereas, the stoneley transmiter is a unique design optimized for low frequency stoneley excitation. The two dipole transmitters are co-located and optimized to maximize output energy for slow, soft rock formations.




  • Gas zone detection (VP/vs)
  • Fracture identification (Stoneley)
  • Permeability estimation (Stoneley)
  • Formation Anisothropy assessment 
  • Formation porosity 
  • Measurement of compressional and shear waves in open or cased-hole 
  • Synthetic Seismograms
  • Lithology and clay identification


  • Combinable with other Gallop tools
  • Records the waveform of the reflected value from formations
  • By measuring sonic slowness, formation porosity can be obtained
  • Rock anisothropy analysis can be achieved (full waveform mode and Azimuth required)
  • Transmitter section assembled with peek sleeves for increased reliability and lower maintenance required
  • Ten independently linked assemblies in the isolator section are included to better attenuate the tool body signal, maintain alignment and provide increased tension & compressive strength.
  • Three programmable operating modesavailable: 
    • Mode 1: Fast Logging
    • Mode 2: Non-anisothropy
    • Mode 3: Full waveform