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Induction sounding slim tool 4IK-45

4IK-45 The tool has the following modifications by max operating temperature Tmax and upper value of borehole hydrostatic pressure Pmax :
  by temperature: 120°C,
  by pressure: 80 MPa.
Designed for induction logging using 4 sondes that have different depths of investigation with simultaneous recording of apparent resistivity active and reactive components for every sonde. Self-polarization curve (SP) is also recorded.

Used for logging of slim open oil and gas wells and directional wells filled with any mud without magnetic additive compounds, with nominal diameter up to 350 mm.

 identification of electrically homogeneous formations and formations with invaded zone, invasion type identification;
 determination of formation competent part and flushed zone resistivity and depth of investigation;
 permeable intervals identification, saturation character and oil and gas saturation evaluation.

The tool contains four three-coil IL sondes –ZI0.5, ZI0.85, ZI1.26, ZI2.05. All sondes of the complex have common receiving coil, common measuring channel and operate at the same frequency of 100 kHz. Lower head of the downhole tool is SP electrode which potential is transmitted upwards by the third conductor of the cable.

Measured parameters Measurement range Error
Sonde Channel σa, mCm/m ρa, Ohm·m ±(0.03×σa+1 mCm/m)
ZI0.3 active 3÷2000 0.3÷300
reactive 3÷1500 0.3÷15
ZI0.5 active 3÷1500 0.3÷300
reactive 3÷1500 0.3÷20
ZI0.85 active 3÷1000 0.3÷300
reactive 3÷1000 0.3÷30
ZI1.26 active 3÷500 0.6÷300
reactive 3÷1000 0.3÷35

 General specifications
Tool length, mm 2850 not more than
Tool diameter, mm 45 not more than
Tool weight, kg 20 not more than
Power supply:
supply voltage, V
frequency, Hz


Borehole diameter, mm 120÷400  
Logging speed, m/hr up to 1500  
Records frequency, pollings per 1 m 10  
Combinability feed-through  
Location in the borehole free/
with standoffs