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Integral gamma-ray logging memory tool APRK-GK


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) by rocks natural activity gamma-ray logging with two independent detectors (2GR). 

Used for logging of nearly horizontal and horizontal sections of oil and gas wells filled with oil- and water-base mud with NaCl compound up to 300 g/l.  

 well sections and lithological changes correlation;
 detailed lithological identification;
 clayiness evaluation;
 rocks mineral composition identification/refinement;
 radiogeochemical anomalies location.

GR detectors – crystal CsI(Na) or NaI(Tl) 37.5×172 mm.


Measured parameters Range Error
ER of rocks natural gamma radiation 0÷250 μR/h ±15 %

 General specifications
Tool length, mm 2700 not more than
Tool diameter, mm 90 not more than
Tool weight, kg 65 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 120÷400  
Logging speed, m/ hr 800  
Operating time in memory mode,  hours in record mode 10 not less than
Records frequency, pollings per sec 2  
Location on the drilling tool