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
MWD Tools | CITM | Gamma Ray Logging | Gamma Sensors

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