For wireline tools, the physical movement of arms on the tool is converted to a diameter measurement through electrical circuitry. The arms are intended to either keep the tool centered in the borehole, or to push the tool against the borehole wall.
Some MWD tools generate a caliper curve based on the differences in the response of the detectors as the tool rotates. Other tools use ultrasonic sensors to generate a caliper by measuring the time taken for an acoustic pulse to travel from the sensor to the formation wall and back.
Some MWD tools generate a caliper curve based on the differences in the response of the detectors as the tool rotates. Other tools use ultrasonic sensors to generate a caliper by measuring the time taken for an acoustic pulse to travel from the sensor to the formation wall and back.
Interpretation Goals
- Indication of hole diameter and volume.
- Input for environmental corrections for other measurements.
- Qualitative indication of permeability.
- Correlation.
- Log quality control.
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