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ACOUSTIC TELEVIEWER

Tool design philosophy & applications
Acoustic Borehole scanner tools generates an image of the borehole wall by transmitting ultrasound pulses from a rotating sensor and recording the amplitude and travel time of the signals reflected at the interface between mud and formation (borehole wall).

Most common applications are
Fracture detection and evaluation
Detection of thin beds
Determination of bedding dip
Lithological interpretation
Breakout analysis
Monitoring of earth stress field
Casing inspection
High resolution caliper

The latest generation of ALT acoustic televiewer is a multi-echo system. This is achieved by digital recording of the reflected wave train. On line analysis of the acoustic data is made by a DSP (Digital Signal Processor). Sophisticated algorithms allow the system to detect the reflection from the acoustic window and to separate/classify all subsequent echoes. Minimum input of the operator is needed to enable:

Automatic optimization of measurement window under all borehole conditions
Automatic adaptation to variable borehole conditions
Improvement of dynamic range of signal detection
Very high travel time resolution
Implementation of different operating mode

Main features
Direct linear 14bit, 10mhz A/D conversion (automatic gain settings)
Dynamic range of amplitude measurement is 84 db
Calliper resolution is better than 0,1mm
Orientation sensor which does not require field calibration
Increased telemetry bandwidth (data transmission rate up to 500kbits depending on wireline), 166kbps typical on 300m four-conductors.
Full wave form recording and real time display for quality control
Multiecho mode to realize acoustic measurements through plastic pipes (require the plastic pipe to be centralized inside the borehole)
Pipe-inspection mode to detect inner corrosion, outer corrosion, and wall thickness
Automatic measurement window definition to gain optimum performance and variable borehole conditions

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ABI40 tool specifications (PDF) ABI40

diameter
length
weight
Max temp
Max pressure
Borehole diameter

40mm
1.6m
6 kgs
70°c
200 bar
2” to 21” depending on mud conditions

acoustic televiewer

Processing acoustic data

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ABI85 tool specifications (PDF)


The ABI85 is a new generation of high temperature and high-pressure acoustic imaging tool based on the well-known ABI40 televiewer technology.
Dewar technology is applied to shield the electronics.
Maximum operating time is 10 hours at 275°C ambient temperature.

diameter
length
weight
Max temp
Max pressure
Borehole diameter

85mm (3” 3/8)
5.2m with ‘inline’ centralisers, 3.7m without ‘inline’ centralisers
150kgs
275°c for 10 hours
800 bar (12000 PSI)
4” to 25” depending on mud conditions


Processing acoustic data

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