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»)




Tool applications:

  • Bulk Density and Pe measurements.
  • Lythologic separation and stratigraphic testing.
  • Reservoir filtration volumetric characteristics, porosity and permeability
  • Identification of fluid contacts and hydrocarbon typing
  • Oriented borehole size and shape image
  • Reservoir navigation and wellbore positioning

Tool features:

  • 16 sector azimuthal density, Pe and borehole caliper
  • Compensated neutron porosity
  • Full borehole coverage density image
  • Two density acquisitions methods
  • Standoff binning compensated density and Pe


Sensor Specification Range Accuracy
Porosity (2NNK), % 0÷40 4.2+2.3(40/Кп-1), %
Density, g/см3 1.3÷ 3.1

 1.3 - 2.0
g/см3  ±1.5%;
 2.0 - 3.1
g/см3  ±1.5 %

Photoelectric Factor (Pe)  1.0 - 7.0

Less than ± 0.2 if Ре<2,5

Less than ± 0.25 if Ре>2,5
Vertical Resolution 25 cm Litho Density
50 cm NeutronPorosity


General Tool Specification
Tool Length, mm 3130 not less than
Tool Size, mm 172 not less than
Pad Size, mm 210  
Tool Weight, kg 500 not less than
Temperature Range:
Max Operating

-45 ÷ +50
Maximum pressure, MPa 80  
Maximum torque, kNm
Max overpull, kN
Compressive force, kN
Standalone downtime, hours in recording mode 240 not less than
Maximum vibration level, g 20  
Maximum Vibration peaks if time less than 6-12ms, g 50  
Flow Rate 63 l/sec  
Connection type NC 50/NC 50  
Modular connection outputs Dual upper and lower  
Hole Size, mm 216÷223  

Well tests and commercial operation of LWD172-2NNL-GGLDL-3GR tool, slant borehole