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.

MechanicalDiameter (OD)1 11/16” (available in 1 3/8”, NGT-S)
Length (make-up)22.25”
Weight6.8 lb.
End ConnectorsGO Single Pin
MaterialTi-6Al-4V Titanium
PerformanceSensitivity/Range1.8 counts per API/0-10,000 API
Accuracy+/- 10% at 175°C
Thin-Bed Resolution (7″ casing diameter, at 50% points)6.2”
EnvironmentalOperating Temperature175°C (350°F)
Survival Temperature204°C (400°F)
Max. Temperature Ramp Rate5°F per minute
Vibration (3 axis); 50-300 Hz, Random30 GRMS
Shock (Z axis)250 G, 0.5 mSec.
Shock (X or Y axis)500 G, 0.5 mSec.
Pressure15,000 psi
Power RequirementsInput Voltage46-48 VDC, 50VDC Max.
Input Current20mA
Output SignalPulse+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.

MechanicalDiameter (OD)1 3/8”
Length (make-up)25.20”
Weight4.0 lb.
End ConnectorsGO Single Pin
MaterialTi-6Al-4V Titanium
PerformanceSensitivity/Range1.5 counts per API/0-10,000 API
Accuracy+/- 10% at 175°C
Thin-Bed Resolution (7″ casing diameter, at 50% points)6.2”
EnvironmentalOperating Temperature175°C (350°F)
Survival Temperature204°C (400°F)
Max. Temperature Ramp Rate5°F per minute
Vibration (3 axis); 50-300 Hz, Random20 GRMS
Shock (Z axis)250 G, 0.5 mSec.
Shock (X or Y axis)500 G, 0.5 mSec.
Pressure15,000 psi
Power RequirementsInput Voltage46-48 VDC, 50VDC Max.
Input Current20mA
Output SignalDigital Telemetry or Pulse+5V to GND, 5 uSec width