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NGT-HTR
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NGT-HTR High Temperature/Ruggedized, Non-Directional Gamma Tool (1.36” OD)
The NGT-HTR gamma sensor is designed to operate in severe, high temperature drilling environments such as those found in Haynesville and Eagle Ford. It is fully operational to 190°C with a vibration specification that is 25% higher than competing tools on the market. The high temperature rating reduces gamma count drift ensuring accurate CPS in hot wells.
The NGT-HTR represents the next generation of downhole directional drilling gamma sensor technology. A complete electrical and mechanical redesign of our industry standard NGT-T gamma tool, the new NGT-HTR drops directly into legacy based MWD systems. Electronics and thru-wires are fully enclosed to improve reliability and external noise isolation. The new single board electronics are cushioned between pre-molded pads, providing superior shock and vibration protection and eliminates potential thermal expansion of flowed potting materials around and under electronic components.
Designed for compatability with Tensor style MWD systems, the NGT-HTR utilizes high temperature 15-pin Micro-D Subminiature (MDM) connectors on the top (male pin) and bottom (female socket) with all wires passed through. Battery power is supplied at Pin 4 with Ground at Pin 1. Output gamma pulses are at Pin 8.
To protect your gamma investment and ensure the best performance use CBG original MWD Shock/Vibration Isolator.
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 | |
| Power Requirements | DC Input Voltage | 10-50 VDC |
| 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).