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Radioactivity logging combined tool SNGK

СРК The tool has the following modifications by max operating temperature T max and upper value of borehole hydrostatic pressure Pmax :
  by temperature: 120°С,
 by pressure: 80 МПа.

Tool code: 2NNKt+SNGK-T-90-Tmax/Pmax

DESIGNED to measure rocks water-filled porosity by neutron gamma-ray logging and to determine rock-forming elements (Ca, Si, H, Cl, Na, Fe,Ti, S etc.).

USED for logging of open oil and gas holes filled with any mud; the tool operates with a three-conductor carrying logging cable up to 7000m long and log recorders that provide for command transfer and data receipt in “Manchester-2”code.

lithological section identification;
formation identification etc.

The measuring equipment contains a chamber for fast neutron encapsulated source (Pu+Be, with output of (Pu+Be, with output of 1·107 n/sec).

Water-filled porosity by 2NNL 1÷40 % 4.2+2.3×(40/phi–1)%
Integral nonlinearity of SNGK sonde energy scale 1% not more
Energy resolution for Cs-137 12% not less
Number of energy channels 256 not less
Measured energy range, MeV 0.05÷10 not less

Tool length, mm 3500 not more
Tool diameter, mm 90 not more
Tool weight, kg 90 not more
Power supply:
Supply voltage, V
Supply frequency, Hz


Borehole diameter, mm 110÷350  
Logging speed, m/hr 250÷200  
Combinability feed-through  
Location in the borehole free