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Caliper from Phase Shift Imbalance (PCAL)
This is an abbreviation for a well log used in the oil and gas industry. You might have encountered this acronym PCAL in your log evaluation software or any (ASCII) log files provided by the logging company. Caliper from Phase Shift Imbalance is the offical name for this log. This log is very common in the industry. This log displays readings of the borehole diameter as estimated by an electromagnetic logging device.
Concluding, this is a measure of the borehole diameter as measured by a logging device: a record of the borehole or the internal diameter of tubular goods. In general this log therefore displays units of the inside diameter (Inside diameter of an entity, such as an item of drillstring equipment).This log usually has the unit 'Cylinder Diameter'.
Data for this log is produced by a tool that uses a electromagnetic logging technique and can be used to investigate the caliper diameter of the borehole.