Multi-Arm Caliper Tools: A Brief Introduction to MAC


Multi-arm or multi-finger caliper logs have been used for decades to create a detailed quantitative profile of the inside of a completion, enabling operators to identify a wide range of integrity problems through the life of the well, such as mineral deposition, corrosion, wear, or mechanical deformation.

Our MAC™ multi-arm caliper tools are designed in diameters that allow them to pass through most completion restrictions. Probe currently offers 40, and 60-finger configurations, and a new-generation 24-finger configuration is anticipated for commercial release in early 2019. The new generation MAC24 incorporates a series of design improvements over previous tools, including highly stable DVRT sensors and the ability to log in real time with surface read-out for electric wireline applications, or in memory mode with battery power for slickline and coiled tubing applications.

As a MAC tool logs the internal profile of the completion, it converts the mechanical movement of each arm—commonly referred to as a “finger”—to an individual electrical signal. The signal from each arm is then converted into a calibrated radial measurement that can be presented in various formats, including individual arm measurements, a casing cross-sectional diagram or a 3-dimensional, color-enhanced visualization. Directional data is acquired simultaneously and can also be included in the log presentation. MAC tool data can be acquired on a standard Warrior™ cased-hole logging panel to offer real-time plotting of downhole data, high-speed data transmission, data processing, and vivid imaging of the inspected casing.

We’d love to talk more with you about how the MAC tool—and our other well integrity products—could help you build a reputable well integrity monitoring business. For more information, click here.