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Compensated acoustic logging memory tool AKG


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 to measure propagation parametersof compressional and shear waves in rocks in-situ. Shear wave parameters are determined only in high-velocity part of the section. Elastic waves parameters are measured according to compensation method to exclude influence of tool’s location in a well.

Used in oil and gas wells including horizontal wells with nominal diameter from 127 to 216 mm, filled with oil- or water-base mud.

 well section lithological identification by  elastic properties of rocks;
 determination of total porosity factor;
 estimation of rocks elasticity modulus. 

The measuring sonde parameters

Sonde formula is R10.4R21.0T110.4T2.  
Emitted frequencies spectrum at level 0.5: 15÷30 kHz.
Transmitters are monopole, cylindrical and magnetostrictive.
Receivers are piezoelectric, spheres 30 mm.
It is possible to use Ø124 mm standoffs.


 Measured parameters Range Error
Measurement of waves parameters in open hole
compressional wave slowness
shear wave slowness

100÷500 µsec/m
200÷500 µsec/m

±5 µsec/m
±15 µsec/m


 General specifications
Tool length, mm 5200 not more than
Tool diameter, mm 90 not more than
Tool weight, kg 200 not more than
Power supply, self-contained, V 12  
Ambient operating temperature range, °C from -10 to +120 not more than
Max operating pressure, MPa 80 not more than
Borehole diameter, mm 124 and 144  
Logging speed, m/ hr 600  
Operating time in memory mode,  hours in record mode 8 not less than
Records frequency, pollings per sec 1  
Location on the drilling tool