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»)


Pulsed multichannel spectrometric tool PIMS-90

pims_90Designed to determine geological material composition, element weight content, first of all, carbon and oxygen content, by recording gamma ray spectrum of inelastic scattering and radiative capture of neutrons, induced by pulsed neutron generator, and also to measure natural radioactive element weight content in geological material: thorium (Th), uranium (U) and potassium (K).

Applied in wells with open or cased hole with any circulation fluid type.

Active tasks:

  • assessment of current oil saturation factor (C/O logging);
  • determination of water intrusion intervals;
  • correlation of well logs and lithologic changes;
  • detailed lithologic differentiation; shaliness assessment;
  • stratigraphic studies;
  • reservoir porosity and permeability determination / clarification;
  • geological material mineral composition determination / clarification.

Probe is equipped with a compartment to install pulsed neutron source (generator), with two gamma radiation scintillation detectors.

Measured parameters Range Accuracy
Hydrocarbon volume content 2÷40 % ±2 %
Energy scale stability over the hydrogen (2.230 MeV) and iron (7.650 MeV) peaks, at least 30 keV
Integral nonlinearity of energy scale within the range of [1000,8000] keV, max 3 %
Vertical resolution 50 cm
Exploration area radius 
*in oil and gas wells
20 cm


General technical specifications
Tool overall length, mm 3073 max
Tool diameter, mm 90 max
Total tool weight, kg 96 max
Maximum ambient temperature, °C 120  
Maximum hydrostatic pressure, MPa 100  
Detector unit BGO, mm 56×130  
Neutron frequency of oscillation, kHz 1÷10  
Neutron pulse ratio 5  
Oscillator operational life, at neutron output of 108 n/sec, hours 300  min
Energy channel number 512  min
Energy spectrum number per depth quanta 12  
Time-interval analyzer channel number 100 min
Combinability terminal  
Position in well free