Geophysical Equipment


ABF 14

The ABF 14, an acoustic logging tool, which gives images of the borehole wall. The principle of the tool is that a narrow pulsed acoustic beam scans the borehole wall in a tight helix as the tool moves up the borehole. A rotating transducer sends pulses of acoustic energy towards the borehole wall. The acoustic energy is reflected from the borehole wall and the ampli-tude and travel time of the reflected signal are measured with the same transducer which generates the acous-tic beam. The ABF equipment consists of a logging tool, a surface panel, a PC with a special interface and the logging software. The ABF 14 tool measures up to 256 amplitude and travel time val-ues per revolution and up to 6 revolu-tions per second can be realized. As the tool moves along the borehole a complete 360 degree image of the borehole wall is produced. A magnetic sensor is used to orientate the image. The travel time image provides de-tailed information about deviations in the borehole shape from the ideal cir-cular cross section.

Available Tools:

ABF 14/1 Acoustic Borehole Scanner for fluid filled boreholes
ABF 14/G Acoustic Borehole Scanner for gas filled boreholes
ABF 14/M Acoustic Borehole Scanner for use in harsh mud

FAQ, General Conditions and Accuracy

  • The quality and accuracy is not de-pendent on the mud density but on any hard particles (e.g. sand, stones) which might be in the mud
  • The ABF scanner can be used for the inspection of cased and open bore-holes
  • All tools are available for single or multi conductor cable
  • All tools can be used like a multi arm calliper (254 arms)
  • Providing the full set of 8 springs for each centraliser, the tool can be used in non vertical wells up to 45°
  • Slits with a width of 2 mm will be detected
  • Holes with a diameter of approx. 5 mm will be detected
  • Corrosion with a depth of approx. 2 mm will be detected.


  • Provides images of rock texture
  • Detects fractures, vugs and washouts
  • Thin bed detection
  • Bedding determination (diameter)
  • Casing inspection
  • Cross sections of boreholes and pipes (calliper)
  • Locates casing corrosion, deforma-tions and perforations

Technical Specification of the Logging Tool

ABF14/G ABF14/1 ABF14/M
Maximum ratings
Maximum pressure 0 Mpa 0,00 psi 100 Mpa 14493 psi 100 Mpa 14493 psi
Operating tempera-ture 100 °C (197,74°F) 150 °C (297 °F) 150 °C (297 °F)
Diameterr 84 mm 3,29 in
Length 3,7 m 12,13 ft
Weigth 75 kg 165,25lb
Max. length for transportation 2,1 m 6,89 ft
Logging speed
min. 1 m/min 3,28 ft/min
max. 10 m/min 32,79 ft/min
Typ rotating coil
Accuracy 1,5° – 3°
2 centralizer at each tool each centralizer with 8 springs (exchangeable)
Conductors 3-wire or mono conductor
Cable length 6500 m 21311,48 ft
Cable head 60 mm RGW (adapters available)
Environment dry, gasfilled fluid filled fluid filled
Borehole diameter:
min. 100 mm 3,92 in 96 mm 3,76 in 96 mm 3,76 in
max. 680 mm 26,67 in 400 mm 15,69 in 400 mm 15,69 in
Typ piezoceramic
Revolving of tran-sceiver 3 rps 6 rps 6 rps
Resonance frequency 300 kHz 800 kHz 400 kHz
Transmitter frequency 542 Hz 1302 Hz 1302 Hz
Mud density mea-surement no yes yes

Technical Specification of the Logging Unit

Consists of
Modul ABF (incl. Power supply for the tool)
Portable PC ; min. Pentium IV 2,8 GHz
Depth encoder
Colour ink jet
Power supply 220 V / 50 Hz or 110V / 60 Hz
WIN2000 or better
Recording Amplitudes and travel times of echo pulses on hard disk