NGT-T Gamma Tool

NGT-T

1.36″ OD Gamma Tool

NGT TThe NGT-T (Natural Gamma Tool-Tensor) is the largest selling MWD gamma tool on the market! With more than 4500 units currently being used in the field worldwide there is no other gamma tool that even comes close.  Initially developed for Tensor in 1993, the NGT-T has been continuously enhanced and improved as the MWD/DD downhole tools industry has matured over the past 25 years.

Designed to meet the Tensor MWD system specifications, the NGT-T contains 15-pin high temperature Micro-D Subminiature (MDM) connectors on the top (male pin) and bottom (female socket).  All 15 wires pass through the tool from top to bottom connectors.  The gamma tool utilizes three wire connections, Pin1 (GND), Pin4 (DC Power) and Pin8 (Sig Out).

NGT-T

1.36″ OD Gamma Tool

NGT T

The NGT-T (Natural Gamma Tool-Tensor) is the largest selling MWD gamma tool on the market! With more than 4500 units currently being used in the field worldwide there is no other gamma tool that even comes close.  Initially developed for Tensor in 1993, the NGT-T has been continuously enhanced and improved as the MWD/DD downhole tools industry has matured over the past 25 years.

Designed to meet the Tensor MWD system specifications, the NGT-T contains 15-pin high temperature Micro-D Subminiature (MDM) connectors on the top (male pin) and bottom (female socket).  All 15 wires pass through the tool from top to bottom connectors.  The gamma tool utilizes three wire connections, Pin1 (GND), Pin4 (DC Power) and Pin8 (Sig Out).

NGT-T Specifications

Detector Nal(TI) Scintillator Crystal1.0” Diameter  X 4.0” Length
PhotomultiplierR3991A (Hamamatsu)
MechanicalDiameter (OD)1.36”
Length (make-up)13.6”
Weight1.7 lb.
End ConnectorsMicro-D Subminiature, 15-Pin
MaterialAluminum Alloy
PerformanceSensitivity1.14 CPS/API*
Accuracy+/- 5% to 300°F
+/- 10% to 350°F
Thin-Bed Resolution (8” hole Diameter)6.8”
EnvironmentalOperating Temperature0°F to 350°F
Survival Temperature (reduced accuracy)-40°F to 400°F
Heat/Cool Rate, Max. 5°F per minute
Vibration (3 axis) 50-1000Hz, Random20G RMS
Shock (3 axis)1000G, 0.5ms, half-sine
Power RequirementsDC Input Voltage17-48 VDC, 50VDC Max.
Tool Current8-11 mA
Output SignalNegative Pulse+5V to GND, 5 uSec width

* Counts are collected with gamma tool mounted within standard BeCu pressure barrel, (OD 1.875″, ID 1.500″).  API Calibration performed with AEA Technology, QSA Inc., KUTh Field Verifier #188074, S/N 255 Radionuclides: K-40(11.7%), U-238(90 ppm), Th-232(40 ppm).