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 pulsed logging tool APILK-90

apilk90s2Designed to carry out geophysical well logging using the method of pulsed neutron-neutron logging of thermal neutrons (2INNK (2ИННК)).

Designed to explore very pitching and horizontal sections of oil- and gas-well bores filled with oil- and water based circulation fluid both in open and cased hole.

Active tasks:

  • determination of current oil saturation on oil fields with oilfield brine;
  • determination of gas-liquid contact;
  • determination of hydrogen content and effective reservoir porosity;
  • lithologic sectional layering.

Detector units – proportional or corona helium counter tubes (He-3).

High-frequency neutron pulsed generator MFNG-601 (МФНГ-601) with gas-filled neutron tube AREV-40 (АРЕВ-40) is used as neutron source with energy of 14 MeV. Neutron output (at neutron pulse oscillating frequency of 400 Hz) – up to 2×108 neutrons/sec.

Measured parameters Range Accuracy
Neutron-capture cross-section 3÷55 c.u. 1.5 %
Hydrogen content measurement range 0÷40 % 4.2+2.3(40/ КА-1) %


General technical specifications
Tool overall length, mm 4556 max.
Tool diameter, mm 90 max.
Total tool weight, kg 108 max.
Maximum ambient temperature, °C 90 (120) see Note  
Maximum hydrostatic pressure, MPa 80  
Neutron frequency of oscillation, kHz 400÷1000  
Time channel number, per each detector unit 100  
Logging speed, m/h 800 max.
Standalone downtime, hours in recording mode 10 min
Diameter of the hole, mm до 350  
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.