Acoustic logging tool 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 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.
![Bohrlochsonde ABF-14](https://geosys-germany.com/wp-content/uploads/2020/10/abf-14-neu.jpg)
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.
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
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
Technische Spezifikation des Bohrlochmessinstruments
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 | |||
Type | 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 | |||
Type | 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 oder besser | |
Recording | Amplitudes and travel times of echo pulses on hard disk. |