Decision by Expert Technical Council at State Commission on Mineral Resources
Recommend the inclusion of the combined steady-state nuclear LWD tool (made by OOO NPP Energiya, LLC) in the register of technologies approved by Expert Technical Council at State Commission on Mineral Resources.


Geophysical equipment

Geophysical instrumentation manufactured by RPE Energiya, LLC (ООО «НПП Энергия»)

Key element


Neutron tubes developed by RPE Energiya, LLC (ООО «НПП Энергия») and FSUE Integrated Plant “Electrohimpribor” (ФГУП «Комбинат «Электрохимприбор»)


Self-contained Lithodensity gamma-gamma ray density logging tool APGGKLP-90

apggklpDesigned to measure rocks bulk density and determine rocks photoelectric absorption index. 
Designed to explore very pitching and horizontal sections of oil- and gas-well bores filled with oil- and water based circulation fluid.

Active tasks:

  • measure rocks bulk density and determine rocks photoelectric absorption index;
  • detailed lithological identification and stratigraphic studies;
  • оreservoir properties identification and rocks mineral composition identification. 

Tool APGGKLP-90 can be manufactured in version with a removable source. Such a design allows radioactive source not to be left in a well in case of emergency.
Tool’s new design and developed probe ensure material quality, that is equal to operating quality of tools on logging cable. 

Measured parameters  Range Accuracy
Rocks bulk density between 1.7×10and 
3.1×103 g/cm3

between 1.7×10and 2.0×103 g/cm3       
± 1.5 %

between 2.0×10and 3.0×103 g/cm3         
± 1.2 %
Photoelectric absorption index

1.0÷7.0 b/e−

±0.25  b/e−


General technical specifications
Tool overall length, mm 3210 max
Tool diameter, mm 90 max
Total tool weight, kg 120 max
Power supply, self-contained, V 12.5  
Maximum ambient temperature, °C 90 (120)  
Maximum hydrostatic pressure, MPa 80  
Diameter of the hole, mm 120÷300  
Logging speed, m/h 200 max
Standalone downtime, hours in recording mode 10  
Record frequency, (samples per second) 2  
Sitting on drill tool  

Note: during logging in wells with temperature over +90ºC it is necessary to use either special heat-resisting power supply elements or thermostat control device for rechargeable battery pack.