NGT-HTR High Temperature/Ruggedized (190°C) Gamma Tool
NGT-HTR
High Temperature/Ruggedized, Gamma Tool (1.36” OD)
The NGT-HTR gamma sensor our next generation tool designed to operate in severe, high temperature drilling environments such as those found in Haynesville and Eagle Ford. New patent pending electrical and mechanical designs push the operating temperature to 190°C and the vibration specification to 25 GRMS, 25% higher than competing tools. The high temperature rating reduces gamma count drift, ensuring accurate counts-per-second (CPS) in hot wells.
Electronics
The NGT-HTR contains CBG’s new patent pending electronics designs. Encapsulated and cushioned within pre-molded high-temperature silicone pads, the printed circuit board is protected from extreme shock and vibration. A new and innovative technique for providing electronics temperature compensation ensures a more stable output signal through the full range of operating temperatures. A burst filter has been added to reduce spurious counts that can result from excessive shock and vibration, as well as external transient noise.
Mechanical
The NGT-HTR has the same overall mechanical dimensions of the NGT-T2. Included is a new patent pending approach to mounting the crystal and phototube for improved shock and vibration performance. The circuit board and thru-wires are enclosed beneath metal covers preventing exposure to external noise and physical damage. No load bearing screws are present for enhanced reliability.
NGT-HTR
High Temperature/Ruggedized, Gamma Tool (1.36” OD)
The NGT-HTR gamma sensor our next generation tool designed to operate in severe, high temperature drilling environments such as those found in Haynesville and Eagle Ford. New patent pending electrical and mechanical designs push the operating temperature to 190°C and the vibration specification to 25 GRMS, 25% higher than competing tools. The high temperature rating reduces gamma count drift, ensuring accurate counts-per-second (CPS) in hot wells.
Electronics
The NGT-HTR contains CBG’s new patent pending electronics designs. Encapsulated and cushioned within pre-molded high-temperature silicone pads, the printed circuit board is protected from extreme shock and vibration. A new and innovative technique for providing electronics temperature compensation ensures a more stable output signal through the full range of operating temperatures. A burst filter has been added to reduce spurious counts that can result from excessive shock and vibration, as well as external transient noise.
Mechanical
The NGT-HTR has the same overall mechanical dimensions of the NGT-T2. Included is a new patent pending approach to mounting the crystal and phototube for improved shock and vibration performance. The circuit board and thru-wires are enclosed beneath metal covers preventing exposure to external noise and physical damage. No load bearing screws are present for enhanced reliability.
NGT-HTR Specifications
P/N 200-100-000
| Detector | Scintillator Crystal | Sodium Iodide, Na(TI) |
|---|---|---|
| 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 150°C +/- 15% to 190°C |
|
| Environmental | Operating Temperature | -18°C to 190°C |
| Survival Temperature (reduced accuracy) | -40°C to 200°C | |
| Heat/Cool Rate, Max. | 2.8°C (5°F) per minute | |
| Vibration (3 axis) 50-1000Hz, Random | 35G (25G RMS) | |
| Shock (3 axis) | 1000G, 0.5ms, half-sine | |
| Burst Filter | Reduces spurious counts due to extreme shock/vibration and external system electronic noise. | |
| Power Requirements | DC Input Voltage | 10v-50v, 60V max |
| Tool Current (at 28V) | 10 mA at 24°C 20mA at 190°C |
|
| Output Signal | Negative Pulse | +5V to GND, 5 uSec width |
* Available upon request with R3991AH (Hamamatsu) PMT as P/N 200-101-100
** Counts are collected with gamma tool mounted within a 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).