ABF 14

USBAThe 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 acoustic 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 values per revolution and up to 6 revolutions 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 detailed information about deviations in the borehole shape from the ideal circular 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 dependent 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 boreholes
  • 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.

Applications:

  • 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, deformations 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)
Dimensions
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
Orientation
Typ rotating coil
Accuracy 1,5° – 3°
Centralizer
2 centralizer at each tool each centralizer with 8 springs (exchangeable)
Cable
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
Transceiver
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
Software
Loggingsoftware
Interpretationsoftware
WIN2000 or better
Recording Amplitudes and travel times of echo pulses on hard disk