CBL-VDL Without Having to Pull Tubing
Through-tubing cement evaluation
The memory slim cement bond logging tool provides a 3-ft cement bond log (CBL) and a 5-ft variable density log (VDL), together with simultaneous recording of gamma ray, casing collar location, pressure, and temperature. Because of its slim size (1 11/16-in OD), the tool can be run into the zone of interest without removing the tubing from the well. All measurements are recorded during a single pass. The tool can be combined with other memory production logging tools for a complete well production evaluation in a single run.
The principal application of the slim CBL tool is to provide an evaluation of cement quality and integrity around casings up to 7 5/8 in. This information can be used to devise remedial measures, such as cement squeeze programs, when necessary.
Accurate and efficient operation
This memory tool service delivers CBLs and VDLs of the same accuracy and quality as those from surface readout (SRO) logging configurations, providing a solution when logistical, operational, or downhole constraints prevent use of the SRO system.
The compact size and portability of the memory slim CBL package facilitate rapid deployment. All tools are certified as transportable by passenger aircraft.
Flexibility and reliability
The portable surface computer system is able to process all the downhole digitized data on site, or it can be done later by Schlumberger experts, as required.
Depth recording systems are available for both hazardous- and nonhazardous-designated operating environments. Optional external sensors enable recording of line tension or applied surface pressure. Measuring applied pressure at the wellhead can be an important diagnostic tool for detecting microannulus.
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