Compact™ Two-Arm Caliper
Orients and eccentralizes tool strings to produce borehole-diameter logs
- Borehole volume calculations
- Tool orientation
Features and Benefits
- The dual (X-Y) caliper provides data for accurate analysis of the borehole shape and volume.
- The powered eccentralization enables short-axis orientation to provide more accurate measurements in a rugose hole.
- The small diameter of the tool facilitates deployment in wireline or memory mode to mitigate the risk of bridging events and to reduce nonproductive time.
- The tool is fully combinable with other Compact wireline technologies.
The Weatherford Compact two-arm caliper (MTC) orients and eccentralizes tool strings to produce borehole-diameter logs. It also provides powered eccentralization in situations where conventional eccentralizers cannot be used such as through-drillpipe logging.
When combined with the Compact photodensity tool (MPD), the lateral force from the MTC exceeds that of the MPD caliper. This forces the density shoe to run up the short axis of an oval hole. Because the axis is usually less rugose and closer to the bit size, the toolstring enables optimal density and Pe log responses. The X-Y caliper logs also provide more accurate hole-volume estimations.
By removing one of the two caliper arms, the MTC can be used as a powered eccentralizer. The enables construction of complex tool-string geometries using multiple MTCs, which can be configured at 60° or 90° in relation to one another.
To provide hole-size input for environmental corrections and hole-volume calculations, the MTC can be used in tool strings with no other caliper measurement.
1,800 ft/hr (549 m/hr)
2.36 to 27.0 in. (60 to 690 mm)
6.0 in. (152.4 mm)
±0.1 in. (2.54 mm)
Depth of investigation
WBM, OBM, salt, air
Maximum outer diameter
2.25 in. (57 mm)
7.11 ft (2.17 m)
61.7 lb (28 kg)
15,000 psi (103 MPa)
Maximum borehole diameter
27.1 in. (690 mm)
Minimum borehole diameter
2.8 in. (70 mm)
The Compact two-arm caliper (MTC) can be used as a standalone sensor or as a tool-orientation device.
Reach out to optimize reservoir performance
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