Probe's MAC™ Multi-Arm Caliper tools are electro-mechanical cased hole logging instruments that provide an accurate and detailed internal profile of the tubing, casing and completion assembly.

MAC Multi-Arm Caliper 

A multi-finger caliper log of the inside of a completion enables operators to cost effectively plan work-over and remedial operations, and to keep  historical records of the general condition of tubing and casing in order to assess any problems associated to corrosion, wear or mechanical deformation through the life of the well.


A series of independent radial measurements provided by the caliper arms, also commonly referred to as “fingers”, yields a detailed image of the inspected well that can be presented in various formats, including a cross-section of the casing and a 3-dimensional, color-enhanced visualization for tubulars ranging from 1 ¾ -in. to 14-in. internal diameter.


Probe MAC™ tools are available in 24, 40 and 60-finger configurations with an extended range of measurement, and are designed with a small diameter housing that allows them to traverse most completion restrictions. A precision machined calibration bowl ensures that each tool configuration delivers accurate and reliable data.


As a MAC tool logs the internal profile of the completion, the actuation of each finger is converted to an individual electrical signal. The signal is converted into a calibrated radial measurement that is transmitted in a data frame that consists of a frame identifier, individual finger channels, electronics temperature data and a checksum, at a rate of 13 times per second. 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.

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