NGT-T 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 1600 tools currently operating worldwide. When we count all the customized variants, the number is almost 2000!

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″	34.05″
Weight	1.7 lb.	15.0 lb.
End Connectors	MDM 15-Pin	200 °C, 10-Pin GE
Material	Aluminum Alloy	BeCu
Pressure	NR	18,000 PSI
Performance
Sensitivity	2.0 Counts per API	1.7 Counts per API
Accuracy	+/- 5% to 300°F. +/- 10% to 350°F.	+/- 5% to 300°F. +/- 10% 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) 50-300 Hz Random spectrum	30 G. RMS	30 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
Input Voltage	22-30 Volts	22-30 Volts
Input Current	18-14 mA. (constant power)	18-14 mA. (constant power)
Maximum Voltage	31.5 Volts	31.5 Volts
Output Signal
Negative Pulse	+5 volts to GND 1.5 to 3.5 uS	+5 volts to GND 1.5 to 3.5 uS