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Dual lateral electric logging tool 2BK3/5


The tool has the following modifications by max operating temperature T max and upper value of borehole hydrostatic pressure Pmax
  by temperature: 120°С,
  by pressure: 80 МPа.
Designed to measure apparent resistivity (ρa) of the rocks crossed by a borehole using methods of conventional logging (CL), lateral sounding (LS) and dual laterolog (LL-3, LL-5), 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
ρa  А0.4M0.1N 0.2÷1000 Ohm·m  ± (5+20/ρa)%
ρa  А1.0M0.1N 0.2÷5000 Ohm·m
ρa  А2M0.5N 0.2÷5000 Ом·м
ρa  А4M0.1N 0.2÷5000 Ohm·m
ρa  А8M1N 0.2÷5000 Ohm·m
ρa  А0.5M2.0A 0.2÷5000 Ohm·m
ρa  А0.5M6.0N 0.2÷1000 Ohm·m
ρa  LL-3 0.2÷20000 Ohm·m ±(5+18/(ρa+1))%
ρa  LL-5 0.2÷5000 Ohm·m ±(5+18/(ρa+1))%
Resistivity meter 0.01÷20 Ohm·m ±(5+18/(ρa+1))%
М∞N(SP), ΔSP +1000÷-1000 mV ±1 mV

 General specifications
Tool length, mm 21030 not more than
Flexible sonde length, mm 17350 not more than
Tool diameter, mm 73 not more than
Tool weight, kg 130 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