The Production Dual-axis Caliper (PDC) is run to correct spinner-derived fluid volumes in varied hole sizes, or to identify casing deformation and areas of deposition build-up. The caliper incorporates a pair of independent arms at 90 degrees to each other to measure casing inside diameter in the X and Y axes.
The roller-tipped caliper arms are spring loaded to make contact with the tubing or casing internal surface to measure the cross section at two independent axis. The arms are fully collapsible down to tool diameter to pass through restrictions and open again automatically once this has been passed. Each arm operates as an independent unit exerting a constant radial force in any casing diameter.