Among all the possible methods of evaluating oil and gaseous well integrity, the Cement Bond Imaging Tool logging technique is highly valued as a powerful device that permits the evaluation of the quality of cementing between casing and formation. CBMT logging, due to its ability to generate detailed images of the cement sheath as well as the formations, is very useful in giving information on wellbore integrity, zonal isolation, and protection of the reservoir. Now, it is high time to examine the peculiarities of CBMT logging as one of the fundamental prerequisites for providing oil and gas wells with further durability and reliability.
Understanding CBMT Logging
CBMT logging is one of the well evaluation techniques that apply highly sensitive downhole tools specially outfitted with ultrasonic sensors and imaging to evaluate the bonding of cement in well-bore holes. Concerning the use of the CBMT tool, it is deployed into the wellbore on wireline or tubing and set at different intervals to obtain images on the cement sheath and casing annulus. These images are valuable for the evaluation of the extent and quality of cement bonds and any problems such as the presence of voids, channels, or insufficient cement contact.
The following are the important features of CBMT logging:
Ultrasonic Imaging:
CBMT tools use ultrasonic transducers to produce a detailed picture of the cement sheath, casing, and formation. These images describe the cement thickness and well-being and continuity to determine the wellbore healthiness further to show cement bonding quality.
360-Degree Coverage:
CBMT tools ensure that an unbearing wall of the casing annulus is imaged, which means imaging the 360-degree casing circumference. This facilitates proper assessment of cement bond quality and evaluation for any abnormalities or deviations from the normal.
Real-Time Data:
CBMT logging as a tool offers real-time logging, thereby offering information about cement bonds that can enable the operators to quickly such information and decide on the appropriate corrective action or wellbore reinforcement.
Quantitative Analysis:
Besides the retrieved visual images, the CBMT logging tools create quantitative data like CBI and bond strength measurements, which adds credibility to the well Integrity analysis.
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