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Gamma-ray spectrometry memory tool APRK-SGK


The tool has the following modifications by max operating temperature T max and upper value of borehole hydrostatic pressure Pmax :
  T max =90 °C, Pmax= 80 MPa;
  T max =120 °C, Pmax= 80 MPa;
Designed for well logging (without usage of logging cable) using gamma-ray spectrometry logging  technique. 

Used for logging of nearly horizontal and horizontal sections of oil and gas wells filled with oil- and water-base mud up to 350 mm in diameter.  

 well sections and lithological changes correlation;
 detailed lithological identification;
 clayiness evaluation;
 rocks mineral composition identification/refinement;
  reservoir properties identification/refinement.

 The sonde station contains scintillation detector CsI(Na) with dimensions 51×200 mm with built-in gamma ðåïåð and  photomultiplier (Hamamatsu R1847).


 Measured parameters Range Error
Thorium mass content (THOR) 0.5÷200×10-4% ±1.5×10-4%, 10% at THOR >15×10-4%
Uranium mass content (URAN) 0.5÷200×10-4% ±1.5×10-4%, 10% at URAN >15×10-4%
Potassium mass content (POTA) 0.1÷20 % ±0.3 %

 General specifications
Tool length, mm 2400 not more than
Tool diameter, mm 90 not more than
Tool weight, kg 70 not more than
Power supply, self-contained, V 12  
Max operating temperature,0C from -10 to +120 not more than
Max operating pressure, MPa 80 not more than
Borehole diameter, mm 350  
Logging speed, m/ hr 200÷400  
Operating time in memory mode,  hours in record mode 10 not less than
Records frequency, pollings per sec 2  
Location on the drilling tool