Schlumberger

Cement Bond Logging Tools

Overview Library

Sonic measurement of the bond between casing and cement

Cement bond tools measure the bond between casing and the cement placed in the annulus between the casing and the wellbore. The measurement is made by using acoustic sonic and ultrasonic tools.

The measurements of industry-standard sonic tools are usually displayed on a cement bond log (CBL) in millivolt units, decibel attenuation, or both. Reduction of the reading in millivolts or an increase in the decibel attenuation is an indication of better-quality bonding of the cement behind the casing to the casing wall.

Slim Array Sonic Tool

A digital sonic tool that provides conventional openhole sonic measurements, standard CBL amplitude and Variable Density log (VDL), and attenuation measurements, which are less affected by borehole environmental conditions.

SlimXtreme Sonic Logging Tool

A sonic logging tool provides the same measurements as the Slim Array Sonic Tool of the cement bond amplitude, attenuation, and Variable Density display for evaluation of the cement bond quality of a cemented casing in high-pressure and high-temperature environments.

Digital Sonic Logging Tool

Uses the sonic logging sonde  to measure the cement bond amplitude and provide a Variable Density display for evaluation of the cement bond quality of a cemented casing string.

Hostile Environment Sonic Logging Tool

Provides the same measurements of the cement bond amplitude and Variable Density display for evaluation of the cement bond quality of a cemented casing string as the Slim Array Sonic Tool in high-pressure and high-temperature environments.

Slim Cement Mapping Tool

A through-tubing cement evaluation tool combinable with the PS Platform  production logging service for well diagnostics. The two sizes are 111 ⁄16 in [4.29 cm] for the standard (302 degF [150 degC]) temperature rating and 21 ⁄16 in [5.24 cm] with a 392 degF [200 degC] temperature rating. The SCMT is suitable for running workover operations and in new wells.

Memory Slim Cement Bond Logging Tool

A cement bond logging tool that provides through-tubing 3-ft CBL and 5-ft VDL measurements with the same accuracy and quality as surface-readout logs. Because of its slim size, the 11 1 ⁄16-in tool can be run into the zone of interest without having to remove the tubing from the well

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Cement Logging Tool Delivers Savings Without Quality Compromise

The Variable Density log service deployment on coiled tubing (A-F) delivered time and cost savings along with surface-readout-quality data (G). Both logs identify poor cement quality at XX54–XX57.
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