NGT-B and NGT-S Wireline Logging Tools
NGT-B and NGT-S
Gamma Tools
The NGT-B and NGT-S are Nal(TI) scintillator natural gamma ray logging tools that are used to make depth corrections to logs by identifying the location of natural gamma rays energy emitted by rock formations behind casing that can be correlated with open-hole logs.
NGT-B and NGT-S electronics are fully temperature compensated to maintain constant count-rates at all related temperatures and provide analog pulse output.
NGT-B and NGT-S
Gamma Tools
The NGT-B and NGT-S are Nal(TI) scintillator natural gamma ray logging tools that are used to make depth corrections to logs by identifying the location of naturally radioactive rock formations behind casing that can be correlated with open-hole logs.
NGT-B and NGT-S electronics are fully temperature compensated to maintain constant count-rates at all related temperatures and provide analog pulse output.
NGT-B Specifications
Mechanical specifications are based on tool mounted in pressure barrel and GO Pin connections. Custom options available.
| Mechanical | Diameter (OD) | 1 11/16” (available in 1 3/8”, NGT-S) |
|---|---|---|
| Length (make-up) | 22.25” | |
| Weight | 6.8 lb. | |
| End Connectors | GO Single Pin | |
| Material | Ti-6Al-4V Titanium | |
| Performance | Sensitivity/Range | 1.8 counts per API/0-10,000 API |
| Accuracy | +/- 10% at 175°C | |
| Thin-Bed Resolution (7″ casing diameter, at 50% points) | 6.2” | |
| Environmental | Operating Temperature | 175°C (350°F) |
| Survival Temperature | 204°C (400°F) | |
| Max. Temperature Ramp Rate | 5°F per minute | |
| Vibration (3 axis); 50-300 Hz, Random | 30 GRMS | |
| Shock (Z axis) | 250 G, 0.5 mSec. | |
| Shock (X or Y axis) | 500 G, 0.5 mSec. | |
| Pressure | 15,000 psi | |
| Power Requirements | Input Voltage | 46-48 VDC, 50VDC Max. |
| Input Current | 20mA | |
| Output Signal | Pulse | +5V to GND, 5 uSec width |
NGT-S Specifications
Mechanical specifications are based on tool mounted in pressure barrel and GO Pin connections. Custom options available.
| Mechanical | Diameter (OD) | 1 3/8” |
|---|---|---|
| Length (make-up) | 25.20” | |
| Weight | 4.0 lb. | |
| End Connectors | GO Single Pin | |
| Material | Ti-6Al-4V Titanium | |
| Performance | Sensitivity/Range | 1.5 counts per API/0-10,000 API |
| Accuracy | +/- 10% at 175°C | |
| Thin-Bed Resolution (7″ casing diameter, at 50% points) | 6.2” | |
| Environmental | Operating Temperature | 175°C (350°F) |
| Survival Temperature | 204°C (400°F) | |
| Max. Temperature Ramp Rate | 5°F per minute | |
| Vibration (3 axis); 50-300 Hz, Random | 20 GRMS | |
| Shock (Z axis) | 250 G, 0.5 mSec. | |
| Shock (X or Y axis) | 500 G, 0.5 mSec. | |
| Pressure | 15,000 psi | |
| Power Requirements | Input Voltage | 46-48 VDC, 50VDC Max. |
| Input Current | 20mA | |
| Output Signal | Digital Telemetry or Pulse | +5V to GND, 5 uSec width |
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