NGT-T Gamma Tool
NGT-T
1.36″ OD Gamma Tool
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
1.36″ OD Gamma Tool
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 Crystal | 1.0” Diameter X 4.0” Length |
|---|---|---|
| Photomultiplier | R3991A (Hamamatsu) | |
| Mechanical | Diameter (OD) | 1.36” |
| Length (make-up) | 13.6” | |
| Weight | 1.7 lb. | |
| End Connectors | Micro-D Subminiature, 15-Pin | |
| Material | Aluminum Alloy | |
| Performance | Sensitivity | 1.14 CPS/API* |
| Accuracy | +/- 5% to 300°F +/- 10% to 350°F | |
| Thin-Bed Resolution (8” hole Diameter) | 6.8” | |
| Environmental | Operating Temperature | 0°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, Random | 20G RMS | |
| Shock (3 axis) | 1000G, 0.5ms, half-sine | |
| Power Requirements | DC Input Voltage | 17-48 VDC, 50VDC Max. |
| Tool Current | 8-11 mA | |
| Output Signal | Negative 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).
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