QL40-CAL – 3-Arm Caliper
Description
The QL40-CAL Caliper probe records a single continuous borehole diameter log by means of three mechanically coupled arms in contact with the borehole wall. The 3 arm caliper measurement is a useful first log to determine the borehole condition before running other well logging probes.
Applications
- Borehole diameter measurement
- Borehole volume calculation before borehole completion, cementation
- Fracture and cavity localization
- Rock integrity evaluation
- Often used in the implementation of environmental correction equations for other logs
Operating Conditions
Borehole Fluid[X] Water [X] Mud [X] Dry Casing[X] Uncased [X] PVC Borehole [X] Steel Centralization[_] Required [X] Not Necessary
Features & Benefits
- Calibrated measurement of borehole diameter in inches, centimeters, or millimeters
- Can be combined with other well logging tools of the QL product line or operated as a standalone tool
- Operates on any standard wireline (mono, 4 or 7 conductor, coax)
- Easy exchangeable caliper arm lengths and wear tips
Specifications – Metric/English
| Specification | Metric | Imperial |
|---|---|---|
| Diameter | 42 mm | 1.7 inches |
| Length | 1.78 m | 70.3 inches |
| Weight | 10 kg | 22 lbs. |
| Max. Temp. | 70ºC | 158ºF |
| Max. Pressure | 200 bar | 2900 psi |
Sensor: High precision potentiometer Standard Arms: 50 to 406 mm/ 2 to 16 inch borehole diameter Extended Arms: up to 736 mm/ up to 29 inch borehole diameter Accuracy: 1 mm Resolution: 0.5 mm
QL Stack Possibilities
- QL40CAL + QL40GR (Gamma) + QL40MGS (Magnetic Susceptibility): Mining, Exploration
- QL40CAL + QL40GR (Gamma) + QL40OBI (Optical Televiewer): Exploration, Bedding Planes, Fractures
- QL40CAL + QL40GR (Gamma) + QL40ABI (Acoustic Televiewer): Exploration, Bedding Planes, Fractures
- QL40CAL + QL40GR (Gamma) + QL40RES (Resistivity)+ QL40FTC (Fluid Res, Temp): Hydrogeologist’s Tool, Groundwater exploration and assessment