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Electric logging tool EK


The tool has the following modifications by max operating temperature T max and upper value of borehole hydrostatic pressure Pmax :
  by temperature: 120, 150, 175, 200 °С,
  by pressure: 80, 100, 120, 140 МPа.
Designed to measure apparent resistivity (ρa) of the rocks crossed by a borehole using methods of conventional logging (CL), lateral sounding (LS) and three-electrode laterolog (LL-3), mud resistivity (ρm) (resistivity meter), self-polarization potential (SP) and SP gradient (ΔSP).

Used in the open oil and gas holes filled with water-base 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.  

 reservoir identification in oil and gas wells section;
 formation resistivity evaluation;
 reservoir saturation evaluation.

 Measured parameters Range Error
ρaА0.4M0.1N 0.2÷200 Ohm·m ± (5+20/ρa)%
ρaА1.0M0.1N 0.2÷400 Ohm·m
ρaА2M0.5N 0.2÷1000 Ohm·m
ρaА4M0.1N 0.2÷5000 Ohm·m
ρaА8M1N 0.2÷5000 Ohm·m
ρaА0.5M2.0N 0.2÷1000 Ohm·m
ρaА0.5M6.0N 0.2÷200 Ohm·m
ρaLL-3 0.2÷20000 Ohm·m ±(5+20/ρa)%
Resistivity meter 0.2÷20 Ohm·m ±(5+20/ρa)%
М∞N(SP), ΔSP -1.0÷+1.0 V ±1 mV

 General specifications
Tool length, mm 19850 not more than
Flexible sonde length, mm 17350 not more than
Tool diameter, mm 73 not more than
Tool weight, kg 110 not more than
Flexible sonde weight, kg 54 not more than
Power supply:
supply voltage, V
supply frequency, Hz


Borehole diameter, mm 110÷350  
Logging speed, m/hr up to 2000  
Combinability feed-through  
Location in the borehole free