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Dual laterolog tool 2BK7/9


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), seven-electrode (LL-7) and nine-electrode (LL-9) laterolog, mud resistivity (ρm) (resistivity meter) and self-polarization potential (SP).

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
ρa LL-7 0.1÷5000 Ohm·m ± (10+20/ρa)%
ρa LL-9 0.1÷2000 Ohm·m
ρa А0.5M6.0N 0.1÷500 Ohm·m
Resistivity meter 0.04÷20 Ohm·m
М∞N(SP) from +1.25 to -1.25 V ±1 mV

 General specifications
Tool length, mm 26100 not more than
Tool length without flexible sonde, mm 8750 not more than
Tool diameter, mm 76 not more than
Tool weight, kg 295 not more than
Power supply:
supply voltage, V
supply frequency, Hz


Borehole diameter, mm 110÷350  
Logging speed, m/hr up to 1500  
Combinability feed-through  
Location in the borehole free/
with standoffs