NGT-T & NGT-TX Gamma Tool Specifications

for Geosteering and MWD

The CBG NGT-T Gamma tool has become the industry standard for Geosteering and MWD applications, with over 3000 tools currently operating worldwide. We also make several customized variants.

CBG Corp. NGT-T Gamma Ray Tool: Click for larger image.

NGT-T Specifications
Version	Without barrel	With 24″ barrel & subs
Application	Geosteering/ MWD	Geosteering/ MWD
Mechanical
Diameter (OD)	1.36″	1.875″
Length (make up)	13.6″, 11.6″ (TX)	34.05″
Weight	1.7 lb., 1.5lb. (TX)	15.0 lb.
End Connectors	MDM 15-Pin	200 °C, 10-Pin GE
Material	Aluminum Alloy	BeCu Barrel
Pressure	NR	18,000 PSI
Performance
Typical Sensitivity	2.2 CPS per API	1.4 CPS per API
Accuracy	+/- 2% to 300°F. +/- 5% to 350°F.	+/- 2% to 300°F. +/- 5% to 350°F.
Thin-Bed Resolution (In 8″ hole diameter, at 50% points)	6.8″	6.8″
Environmental
Operating Temperature	-77 to +350 °F.	-77 to +350 °F.
Survival Temperature	400°F.	400°F.
Max Heat/Cool rate	5°F./Minute	5°F./Minute
Vibration (3 axis) 50-1000 Hz Random spectrum	20 G. RMS	20 G. RMS
Shock (Z-axis)	500 G., 0.5 mS.	500 G., 0.5 mS.
Shock (X or Y-axis)	1000 G., 0.5mS.	1000 G., 0.5mS.
Power Requirements (all new tools use NexGen electronics)
Input Voltage	17 – 48 Volts	17 – 48 Volts
Input Current	11-8 mA. (9 mA at 28 volts)	11-8 mA. (9 mA at 28 volts)
Maximum Voltage	50 Volts	50 Volts
Output Signal
Negative Pulse	+5 volts to GND fixed width 5 uS	+5 volts to GND fixed width 5 uS