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The Caliper is a mechanical measurement of the borehole, or casing diameter using 3 arms that pivot on a single shaft, providing a measurement of minimum diameter. In open hole, the caliper is useful to determine “squeezing” and/or “wash-out” due to swelling clays, flowing sands or friable sands. With other open-hole logs the caliper is useful for correlation, and understanding log response. Our 3-arm Caliper tool measures borehole or casing diameters from 3" to 50". The log provides a graphic representation of the effective diameter of the borehole as well as total and annular volumes for gravel and cement volume calculations. Annular volume can be calculated for any configuration of casing schedule with varying strings of pipe sizes and lengths. Volumes are presented as a tabular list corresponding with depth and casing schedule (see below).

Click on thumbnail for a larger image of the CALIPER sample.

Download PDF of CALIPER

Download PDF of Caliper Tool Specifications

Click to find more about:

Electric Log
Laterolog 3 Resistivity
Focus Dual Induction
Sonic Velocity
Fluid Resistivity
Video Survey
Spinner (Flowmeter)
Gyro/Directional Survey
Depth Specific Fluid Sampling Biological/Scale Sampling
Cement Bond Log

Acoustic Borehole Televiewer
Optical Borehole Televiewer
Noise Log
new Casing Inspection Log (CITM)

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