A low-frequency bi-directional electric current from a source electrode on the probe returns through the formation to the cable armour above an insulated bridle. Potentials due to this current flow are measured on various sense electrodes on the probe with respect to a voltage reference "fish" normally located at the surface. These measurements are converted to apparent formation resistivities within the probe and transmitted to the surface.
Diameter: 45mm
Length: 2.75m or 3.16m (with 8" and 32" option)
Weight: 11kg
Temperature: 0-700C (extended ranges available)
Max. pressure: 20MPa
Resistivity range: 1 to 10,000 ohm-m
Water:
-Determination of water quality
-Indication of permeable zones and porosity
Minerals/Engineering:
-Bed-boundary positions
-Strata correlation between boreholes
-Fracturing Indication
Borehole type: open-hole, water-filled
Recommended Logging Speed: 4m per min
ID
EN